Why Inline 4 Engines Always SUCKED for Airplanes, Until NOW - Technical Deep Dive

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In-depth and easy to understand engine balance explanation (highly recommended): • Deep Dive: Inline 4 vs...
2 Cylinder Airplane Engines - Technical Deep Dive : • BEST 2 Cylinder Engine...
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I4 engine block : Author AntoniusJ (creativecommons.org/licenses/...) no changes made
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Lycoming IO-390 : Author FlugKerl2 - (creativecommons.org/licenses/...) no changes made
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FK12 Comet with Lycoming IO-233 : Author FlugKerl2 - (creativecommons.org/licenses/...) no changes made
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Continental O-200 on C150H : Author YSSYguy (en.wikipedia.org/wiki/User:YS...) (creativecommons.org/licenses/...) no changes made
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DH60 Moth pair : Author Alan Wilson - (creativecommons.org/licenses/...) no changes made
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De Havilland Gipsy Major : Author YSSYguy - (creativecommons.org/licenses/...) no changes made
Heath B4 4-cylinder I4 engine : Jim1138 - (creativecommons.org/licenses/...) no changes made
Wet sump lubrication system illustration : UtzOnBike - (creativecommons.org/licenses/...) no changes made
Cessna 152 : Author MilborneOne - (creativecommons.org/licenses/...) no changes made
Piper Cherokee 180 : Author Mike Burdett - (creativecommons.org/licenses/...) no changes made
Viking 150 : www.vikingaircraftengines.com...
Colombo S.53 engine : Author MLWatts - (creativecommons.org/licenses/...) no changes made
Rotax 915 : Author Matti Blume - (creativecommons.org/licenses/...) no changes made
Coolant pump : Author Raimond Spekking - (creativecommons.org/licenses/...) no changes made
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1 июл 2023

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Комментарии : 560

@erwinb3412 10 месяцев назад

Thank you very much . As a layman person i understood everything very well . To the point with not too big of a jump between items so that i could understand the flow of the logical reasonings . This info is very interesting and this is the first video that i saw about these items . Engines are fascinating , and so is aviation . Erwin , Belgium .

@darwinskeeper421 10 месяцев назад

The main reason why we wouldn't see a high speed inline four cylinder aircraft engine is economics. The general aviation market is too small for a manufacturer to recover the expense of designing, developing and certifying a high speed inline four engine. Heck, even if an automobile manufacturer was willing to redevelop one of their own inline fours into a 200 hp aircraft engine that could replace the Lycoming O-320 & O-360 engines, AND they dominated the 160-200 hp engine segment for production aircraft, they probably wouldn't be able to sell enough engines to recoup the cost of development and certification.

@chippyjohn1 10 месяцев назад

That's the real reason.

@michaelgarrow3239 10 месяцев назад

The certification mostly..

@yveslegrand9826 10 месяцев назад

😂 Certification is a bad joke. It makes old and inefficient design a compulsory safety demand. In France it resulted in a identical aircraft being available in a safety chute version ONLY if classified as Ultralight... Many exemples exist at all levels showing how ridiculously the certification rules impacts both aviation performance AND safety. Not taking chances for progress is a very safe way to stay in a dangerous situation.

@r.guerreiro140 10 месяцев назад

What about Diamond Aircraft?

@Mikinct 10 месяцев назад

Funny, since both Lycoming & Continental plane engines are soo good & reliable I'm shocked that we don't see those same reliable & great engines inside more cars? Is there any reason one mechanic couldn't install a Lycoming engine in my Subaru or Camero if I truly desired that specific engine of choice. Not practicality but could & would ot work? Is there really any reason it wouldn't work? Question 2, why don't we see a Mixture knob for cars that drive at higher elevations in Colorado etc. Is it more feasible & economical to simply purchase a car that has turbo equipped if I lived around Colorado areas?

@davisrs1 10 месяцев назад

I'm glad you mentioned the Yamaha Apex engines. The 4 cylinder was putting out 300 hp, but the new 3 cylinder is capable of 400 hp. This is presently being used by Wild West aircraft as an option for bush aircraft.

@danieldimitri6133 10 месяцев назад

Rotax has made a 3cyl for years which is used in jetski. that put out between 215 and 260hp then they upped the displacement and make 300hp currently but speed run guys have boosted them up quite a bit above that. Suddenly automakers have started looking at 3cyl forced induction for racing and hybrid applications for their super light weight and compact designs. Yamaha is probably lower maintenance or they are as a brand but it has surprised me that experimental guys haven't tried a rotax even though they have used Yamaha and Kawasaki snowmobile engines which are very similar. I do know that Yamaha 4cylinder engines crack cylinder heads. But rotax engines shake a lot and have an open deck so the sleeves are only attached at the bottom and the top is honly held still with the friction to the headgasket. you find head gasket material in the coolant.

@russbell6418 6 месяцев назад

@@danieldimitri6133 The Yamaha 3 cylinder has a counter balance shaft and thereby is extremely smooth.

@jiroyamamoto2878 Месяц назад

@@danieldimitri6133 Production form factor is the reason for the popularity of snowmobile engines in aircraft. Very few motorcycle engines in the skies due to the integral transmission.The trike and gyro crowd led the charge on the Yamaha conversions. Teal Jenkins with his well made Propeller Speed Reduction Unit (PSRU) allowed people to buy a PSRU and have some faith in its reliability. Further, I am guessing that snowmobiles have a relatively short life span versus personal water craft, allowing low cost used engines on the market.

@MyFabian94 10 месяцев назад

Peugeot/Ford has the DV6 1.6l Diesel, which I worked with a lot when I did a short stint as an Engine Rebuilder. It's an Aluminium Diesel with ridiculously low Weight if you leave off all the Car-Bits, and as an 8V sits at 120hp in the DV6 FC Variant. It combines this with a 1980s style Engine Architecture, meaning it has a single Cam, sitting in a seperate housing on the Cylinder Head, the Intake Manifold is integrated into the Head with only a single Inlet coming into it from the Turbo, a Two Piece Crankcase and a simple stamped Sheet Steel Oil Pan. It should make for a great UL Diesel/Jet-A1 Engine. Basically, I'm looking from someone to partner up with, as I simply do not have the funds or knowledge to start a company.

@Joshie2256 10 месяцев назад

120 hp from 1.6 liters won't last long whether it's diesel or gasoline. Auto engines produce 60% or more of their rated power only for brief amounts of time while an aero engine spends most of its life between 60% cruise and takeoff power.

@timgould5104 9 месяцев назад

It's bigger brother the DW10C permanently derated after 5 hours(!) of full load rated speed .

@glibsonoran 10 месяцев назад

Diamond used a 2.0: inline four cylinder diesel (modified Mercedes OM640) with gearbox, this a certified production aircraft.

@daledavies2334 10 месяцев назад

The recip aircraft engines are designed similar to heavy truck engines for reliability. Yes they are considerably lighter. The cylinder spacing is greater than most automotive engines which allows wider (thicker) crankshaft throws. Also the fillets at the sides of the main and connecting rod journals are ground with a larger radius to reduce the possibility of stress risers. Most automotive engines run on a low duty cycle, so fatigue resistance is not as critical. Automobile engines with max power of 200HP probably only require 30HP to drive at 60MPH. This is a low duty cycle with short bursts of maximum power for a few seconds. Aircraft run full power for takeoff for 5 minutes and then reduce power to 75% for the rest of the flight. Auto engines in aircraft have short TBOs because the narrow crank throws and small radius fillets allow flexing fatigue to build up, leading to failures. Regarding the certified Mercedes based engine, is not likely plucked off the Mercedes assembly line and with minimal changes ready to install in an airframe. Diesels are designed and built more substantially, but for aircraft I would think crank fillets would need their radius increased even more. Exhaust valve cooling is a key issue to resolve. Wider seat contact area and larger diameter valve stems to provide more area to transfer heat out of the valve.

@daledavies2334 10 месяцев назад

@WilhelmKarsten 6 месяцев назад

@@daledavies2334YOU SIR ARE A BALD FACED LIAR. Automotive type engines are very different from aircraft in several ways but that does not mean that auto engines cannot pass airworthiness certification. Mercedes and Porsche have proved this. The only type of engines that have consistent proven unsuitable for aircraft is the Wankel engine.

@WilhelmKarsten 6 месяцев назад

@@daledavies2334WRONG, Mercedes delivers the short block assembly directly to Theilert

@daledavies2334 6 месяцев назад

@@WilhelmKarsten Wilhelm, I have no recollection of mentioning Thielert or Diamond. I have written only about rotary engines and a short dissertation on the shortcomings of recip engines in general. Back to the Schnapps.

@AusVelocity 10 месяцев назад

I feel the biggest downfall of the horizontally opposed engines is the air-cooled cylinders and the leaded avgas. The cylinder walls are thin and vibrate on the case making for less life and more noise. The air-cooling means bigger clearances for greater temp ranges for greater thermal expansion. The avgas pollutes the oil, through blow by leading to sludging and lead sticks on valve stems. I couldn't bring myself to put one in the velocity, I wanted something modern simple and predictable so i went the viking 195 route. Good content and i think the topic of auto engines in aircraft needs more exposure.

@JimBronson 10 месяцев назад

Traditional aviation engines could be better if they got away from the leaded avgas. That would enable closed loop operation, which would be a big step forward in engine control in regards to air fuel ratio and spark control. The Lycoming IE2 is a step forward with EFI and push button start, but it's still desgined for leaded avgas. Full closed loop with unleaded avgas would be another step forward for AFR control over the lifetime of the engine. They'd probably last a lot longer that way, car engines sure did once modern fuel and spark control was available.

@Bob_Adkins 10 месяцев назад

Don't know about aircraft boxers, but car boxers are known for thin, poorly supported rod and main bearing webbing. Porsche goes racing with them to this day, so they must have beefed them up.

@jeffreyroth7517 10 месяцев назад

Enjoying watching the progress!

@rescue270 5 месяцев назад

Removing lead will cause current production old-school engines to last FOREVER. I really don't see much use in coming up with more expensive, complex engines when what we already have is as reliable and affordable as it could get. Just get the lead out and overhauls will almost go by the wayside.

@ArneChristianRosenfeldt 3 месяца назад

You mean that the walls expand when the pressure rises inside the cylinder? I read that steel has good tension strength and stiffness per weight. Why no flow more oil through the head and piston with a pump which continues after engine out to avoid coking? Do liquid engines have valves to lock the incompressible water in the jacket at each power stroke? Like in a 1921 Buick car engine?

@robbytheremin2443 10 месяцев назад

I suspect the biggest obstacle is the insane cost of certification. It's caused the demise of several innovations. 😢

@LetsGoAviate 10 месяцев назад

For sure. But even on the experimental side where certification isn't required, it's much more cost effective to convert auto engines than design from the ground up.

@toastrecon 10 месяцев назад

It'd be interesting to innovate in the area of certification. There would be almost zero drive to do so from the major engine manufacturers because it's their competitive barrier to entry, but if there were a lot more investment in ways to streamline the certification process, like computer analysis and simulation, different best practices that are required or other ways to make it faster and cheaper.

@arcanondrum6543 10 месяцев назад

@@toastrecon As an electronics engineer and a software/qa developer, I get a bit tired of the push for simulation testing. I knew plenty of developers who weren't too interested in making sure that they had taken every possibility into account, they wanted to ship and cash in. Nothing but nothing replaces real world testing and since I'm also a (not currently current) Pilot, I know the importance of equipment. You can't pull over and fix a problem up there. I'm not afraid of a dead stick landing but they're too expensive, even without any airframe damage and no, I don't speak from experience.

@toastrecon 10 месяцев назад

@@arcanondrum6543 simulation wouldn't replace testing, but I'm guessing that it could dramatically streamline it, or allow smaller companies to get an 80% solution before sending it to test, that would improve competition and help new companies learn and enter the market with innovations.

@DKNguyen3.1415 10 месяцев назад

@@toastrecon You'd think so but simulating a real world thing can be surprisingly difficult and if you don't do enough you might assume things you otherwise wouldn't have. Sure you might catch things you wouldn't have caught but I don't think anything that can be called an 80% simulation would catch those things.

@richardwallinger1683 6 месяцев назад

captivating video clear voice . I was Donnington GT champion in 1980 in the UK.. my powerplant was a self modified four cylinder hillman IMP engine developing 120 bhp at 9,000 plus rpm .the engine was tilted over and ran wet sump . running the water and oil pumps at lower rpm actually improved the cooling and reliability .. I loved your accent .

@craigcurtis2961 2 месяца назад

Master Auto Tech here: Certificated means "thoroughly understood", not "this is the best". Lycoming and Continental aircraft engines have two cylinders' worth of crankshaft throws and camshaft lobes between shaft bearings; this long distance allows tremendous amounts of "noodling" flex of the shafts and case; bearings typically have hourglass-shaped wear patterns due to so much dynamic misalignment, plus cylinders and engine cases sometimes fail where they meet due to vibration. I've NEVER seen that wear pattern in any modern automotive engine, including V engines in which 2 connecting rods share 1 journal. The last auto engine I saw with that much distance between bearings was a 1960's MG. Why are aircraft engines not rated above 2800rpm? Because they're likely to blow up much higher than that! Fortunately, typical diameter propellers are limited in RPM by the tips going transonic.

@Blackcloud_Garage 10 месяцев назад

Great content. I'll be the first to admit "if it ain't broke don't fix it" but there's something to be said about engine tech from the 1930's. We are definitely in an age where state of the art engine tech can/should be applied to light aviation.

@BuzzLOLOL 10 месяцев назад

LOL! Inline 4s sucked for everything... go smooth 90 degrees V2, V4, V6, V8, V10, V12, V16, or boxer 4, 6, 8...

@dposcuro 10 месяцев назад

@@BuzzLOLOL V2s are anything but smooth. V4 is the least smooth 4 cylinder engine possible. The V6 is a pair of inline threes, out of phase with each other, and work best at 60 degrees, not 90. Just...hard to believe that you could say so much wrong, in one post. Simply put, Inline 4 cylinder engines are great engines. In cars, they don't force you to make compromises with the suspension and frame like a flat engine does. They do have primary balance, unlike a V4, which also introduces a torsional or rocking moment. They offer better engine bay packaging for front wheel drive cars than either. Flat or V4 engines. Nothing needs to be buried under a cowl or the floorboards if it is transverse, so there is no incentive to do the dumbest method of longitudinal front wheel drive...unless you're AUDI or VW Brasil in the 80s...or Surbaru, or SAAB (pretty sure I've missed a few). Why is it the dumbest method? Well, if you're Audi, VW, or Subaru, you hand the engine out _in front_ of the transaxle, leading to absurd weight balance issues, having so much mass so far forward. SAAB on the otherhand...doesn't have a oil pan, because the transaxle is...part of it, with the front diff right under the front of the crankshaft. For Aircraft? An Inline 4 gives you the least frontal area, for better aerodynamics.

@BuzzLOLOL 10 месяцев назад

@@dposcuro - For you to be so totally wrong, you must have zero experience with these engines... ride a Ducati V2 and a Yamaha V4 and then come back educated!

@crissd8283 10 месяцев назад

1930s tech?? There are a few planes flying today with that old of systems but most are much newer. New electronic controlled magnetos, mechanical fuel injection, and now electronic fuel injection. I would argue airplane engines are about 40 years behind car technology. Sure in an old plane the tech is old but that is also true of old cars.

@BuzzLOLOL 10 месяцев назад

It's vastly more important in aviation for new tech to be proven totally reliable than in cars... it's harder to simply pull over and stop when something fails in a plane...

@LTVoyager 10 месяцев назад

The Rotax 9 series engines have all of the things you mention such as dry sump, water cooling, and gearbox and they are doing quite well. I do with Rotax would develop a mono lock engine such as a V4 or V6 as that would overcome many of the packaging issues of the inline 4.

@LetsGoAviate 10 месяцев назад

Rotax is somewhat of an anomaly in my opinion. They are extremely reliable, my airplane is powered by a 912.

@LTVoyager 10 месяцев назад

@@LetsGoAviate I am hoping they are reliable as I am installing a 915iS in my airplane at the moment. I actually consider Lycoming and Continental to be the anomaly’s today. Persisting with early 20th century design and technology well into the 21st century is the real anomaly. I think Rotax will soon become the norm leaving the others in its wake if it moves into the 200+ HP range. And if they offered a mono block V-6 with integrated dry sump system they would have a real winner in the 150 to 300 HP range. I say integrated dry sump as I spent most of yesterday figure out how to route and connect the 5 oil hoses that run between the engine, oil cooler and oil tank. What a pain!

@joshhhab 10 месяцев назад

VR6

@foesfly3047 10 месяцев назад

I’m anxious for liquid cooled, ECU-controlled, higher-efficiency, ‘affordable’ engines, especially for EAB aircraft

@thegreatchickenoverlord5976 10 месяцев назад

Not exactly affordable but the continental cd-135 is a thing

@russbell6418 6 месяцев назад

Within the US experimental world, there are Subaru and Yamaha options.

@rescue270 5 месяцев назад

There are reasons why aircraft engines are air cooled, have magneto ignition systems, and carburetors or mechanical fuel injection. Magnetos are independent of any electrical systems. Totally self-contained, they generate their own electricity. The whole airplane electrical system can fail and the engine will keep running as if nothing happened. Since 1941, two separate ignition systems are required on all new aircraft for safety. At least one of these must be a magneto. If one fails, the other keeps the engine running to a safe landing. Water cooling adds weight, one more point of failure, and one more system that requires rigid maintenance in order to be reliable, as the Thunderbolt proved over the Mustang and the Spitfire amongst Allied WWII aircraft. One round to the radiator or water jacket brought the water cooled aircraft down. Many air cooled P47 Thunderbolts made it back safely with whole cylinders shot off. Electronic fuel injection is, once again, dependent upon the airframe electrical system and adds complexity. Electronic injection systems were developed in cars predominantly for emissions. Backup batteries for electronic systems are not the answer. One more maintenance item to be neglected and one more unseen system to fail. These new engines are making all their horsepower through high compression, gearing and turbocharging so the engines are spinning much faster. This is too much of an automotive mindset. Cars cruise down the road using perhaps 12-18% of their total power potential, while many aircraft need 60-70% power just to maintain altitude. Given the stress that that would continually impose upon such a complex and high strung engine, I doubt that they would be nearly as durable over the long term as a typical Certificated engine. Diesels can't fly with a failed turbo, so I don't endorse those. I do believe that continuing research and development is crucial to aviation, but I think it's going in the wrong directions. We can't be making airplanes into flying cars. The realm of flight is very different, and the engines that many people are calling crude and archaic took many decades of development to get where they are now. Safety and reliability should take precedence over economy, not be an afterthought.

@timduncan8450 3 месяца назад

@@rescue270 The current trajectory is for the “realm” of personal flight to be the sole province of the economic elite. This is not how a successful technology develops. It’s not what this country or the fathers of aviation laid out us. Adaptation of mass produced engines seems like the obvious if not the only way to fix this. That means motorsports & automotive. Obviously reliability must also be improved which they have done in spades. The electrical issues you bring are real, mostly ancillary to the engine so must be addressed (and can be) in the firewall forward package. System failure is not an option so hoses & all such must all be right to achieve that. It is not easy but I have driven millions of miles without a cooling system failure. As example, I would put up any reliability stats on reputable coil over EI systems vs a pair of mags any day. Motorsport engines like the Yamaha incorporate a brushless generator on the crank for inertia and ignition power. My engineering and engine experience is that shorter stroke higher reving (within established piston speed limits) can be very durable and economical. Yes aggressive down sizing and or boosting is required to compete on system wt. But this can be a good thing, trading the moving parts in a 4 cyl for a three with balance shaft is a good win. Balance shaft has no piston scoring, valve dropping, ring sticking, bearing spinning, lifter scoring, etc, etc issues. Cutting those odds by 25% right at the dwg board is a good win. Getting back to larger cyl bore within the downsized engine will help bsfc vs 4’s. Furthermore forced induction is a natural for airplanes, a huge safety enabler against density altitude and weather. Power plants outside of aviation have shown it can be cheap and reliable for decades now. A few years ago I would not be a fan of a three. But clearly it can be done.

@jwboatdesigns 10 месяцев назад

With respect, DeHavilland build many many versions of their Gypsy four and six in line engines, they were used in a lot of light aircraft and a lot of them are still flying.

@LetsGoAviate 10 месяцев назад

9:41 in video I mentioned the dozens of aircraft using the engine, and video of one of the many currently flying in my area

@milesinnz 10 месяцев назад

@@LetsGoAviate well you should have put it at the beginning.....

@christophercripps7639 10 месяцев назад

Many years ago Porsche developed an aviation version of its circa 3 liter, turbo charged air cooled, boxer 6. The engine was a mature design and had been tested under severe operational conditions (24 hour endurance motor sports). Really anything an in-line 4 with turbos can do a similar boxer six can do better without secondary imbalance - except perhaps cost.

@louisvanrijn3964 10 месяцев назад

It was an injection engine. EASA demanded hence double generators and fuel pumps for a secure power supply. That double-of-it on vital sytems is logical because all other engines had also double, fully independent ignition. The profits of this expensive to manufacture, low-volume engine was marginal for Porsche so they pulled the plug. Logical, because claims (USA) could ruin the profit of years at once.

@BuzzLOLOL 10 месяцев назад

The Ducati 90 degree V2 is so smooth you can't feel it running... inline 4 kinda sucks for every use... VW/Porsche boxer engine started for water pump and aviation uses, as I recall...

@WilhelmKarsten 6 месяцев назад

Porsche has won the 24 hours of Le Mans 19 times!!. It's 6 cylinder 901 series is one of the most reliable engines in the world

@WilhelmKarsten 6 месяцев назад

@@louisvanrijn3964Mooney did little to promote the design either.. It was expensive, very expensive

@christophercripps7639 6 месяцев назад

@@WilhelmKarsten The 12 cylinder in the immortal 917; was essentially two boxer sixes joined together with a central power take off. In its 5.4 liter turbo form in the hands of Penske & the 917/30 all but killed the the CANAM series. Then the run of the 936, 935, 956/962 … began.

@keithnoneya 10 месяцев назад

Not a pilot or aircraft designer, but have always enjoyed aviation as a whole. I found the video very informative and interesting. Thanks so much for your time in producing the video. Best Wishes & Blessings. Keith Noneya

@LetsGoAviate 10 месяцев назад

Thanks Keith, appreciate it.

@amramjose 10 месяцев назад

As a former aircraft mechanic student (got my A&P, never used it) I was astounded at the primitivity of the "boxer" types of engines, with no bearings for camshaft and other rotating surfaces, pushrods instead of overhead camshafts, old magnetos for ignition and a near total lack of electronic engine controls. Now FADEC has contributed to some advances, as well as electronic fuel injection. Still general aviation seems to lag behind automotive technology by at least a few decades.

@ArneChristianRosenfeldt 3 месяца назад

What do you mean with “no bearings”? VW type 1 flat boxer had 3 main bearings and many more elsewhere. I would like to see a flat 6 with 4 main bearings. A magneto is just a dynamo which creates voltage on demand. So you want transistors? Still need a Dynamo though. OHV are perfect for the revs of a propeller. I think that EFI is available for all engines. I would like to see EFI which ties into the magnetos. No leaking battery.

@diamondeyz6333 10 месяцев назад

Thanks for the presentation.....would like to see you do a deep dive into what Diamond Aircraft is doing with the Austro Engine....essentially an adapted Mercedes diesel engine burning Jet-A. I have owned one for 2 years now and with Jet-A, FADEC and a host of other benefits, would never consider owning the old tech engines. Also, have a look at the Continental CD-300.....a V-6 design now being used in the Diamond DA50RG. Have a look and let us know what you think....Thanks again, DiamondEYZ

@MegaDada1995 10 месяцев назад

Exactly what I came here to say, the Austro/Thielert/CD family of engines is really the way I'd love to see more aircraft manufacturers go. Jet-A is definitely the way to go with higher compression ratios, lower fuel consumption, lower fuel price and (at least outside North America) better fuel availability. Personal opinion, they smell better too...

@AlRoderick 10 месяцев назад

This reminded me of a tangentially related story, there's a flathead straight six that's been designed by roush racing to fly on a rocket. The last stage of the ACES launch system (which I don't know if they're still working on) has an APU designed to run the hydraulic pumps and generator, it's a top stage engine so it's supposed to be able to start and stop (unlike a lower stage engine which just goes once), they need this little secondary engine to keep things running, it makes a cool 26 horsepower. And I do mean cool, because it's running on cryogenic temperature gas it doesn't need a cooling system, in fact, the heat off the engine is used to pressurize the fuel system.

@Doan84 10 месяцев назад

The "TEI PD-170" and "PD-222" is an inline 4 Diesel Engine, purpose built for Aviation. It was developed for the infamous Bayraktar TB-2 Drone, to replace the Rotax Engine, which Canada put an export ban on. I'd like to see your opinion on that engine actually.

@russotragik 10 месяцев назад

Don't even need to go that far, we have the Austro E4 that is an straight 4, and the 912 is a geared engine. And...the IO-720, have a 4 bank engine that the cooling of the back cylinders isn't an issue, actually, if wasn't by production costs, we'd have the Lycoming O-1230 still in production for crop dusters. There's also some certified conversions from Viking Aircraft, AeroMomentum, AeroMot and others, that uses regular car engines as aircraft engines with some success. Today the major.fault of lack improvements are the pilots that still "don't trust electronics" and innovation on their engines, so they prefer "ye ol' reliable Lycoming"

@stephenstephenson6614 10 месяцев назад

I only shows that I learn something from, no fiction. Thanks for such a great informative show.

@mor4y 10 месяцев назад

You might find a interesting wee rabbit hole looking into 1960's and 70's bank robbers from the UK, they could tune those 2.0ltr V4 engine that appeared in early transits and some saabs to make them preferable to use for 'work' over Jaguars of the time!

@richardtheweaver4891 3 месяца назад

8:27 There is a third factor: rod to stroke ratio. Engines with a 3:1 or more rod to stroke (like marine engines) aren’t terribly bothered with secondary balance issues. In-line fours can be way angled, which gives better oil handling than boxers. 70 or 85 degrees to one side means gravity still helps oil flows. And single prop planes have a “preferred” side based on prop rotation. A prop/engine pair with different centers of mass/thrust could play well with a single prop’s asymmetry.

@chippyjohn1 Месяц назад

What marine engine has a rod to stroke ratio of 3:1?

@ChristopherBurtraw 10 месяцев назад

You did a good job quickly explaining secondary imbalance. It took me years to fully understand it... and a D4A video was a BIG part fully completing that understanding (it was one that focused on your later point on the displacement limits of I4 engines). I'm glad you linked a video by that channel!

@tomcoryell 10 месяцев назад

Excellent explanation of a rather complex subject! Cost will always be a determining factor in aviation engine choice, consequently why design a new engine when you can modify an existing and less expensive engine like Apex or Viking have done.

@ArneChristianRosenfeldt 3 месяца назад

Because of time. Every year there is the chance that someone is just bored or needs a project to learn stuff . This gave us Linux. The problem is that all the 10 times engineers which were attracted to aviation have moved on to modern fields like computers.

@chengong388 10 месяцев назад

The simple reality is, the inline 4 car market is like 1000x the size of general aviation market, so cars simply have much more advanced engines, while light airplanes are still running designs from many decades ago.

@danieldimitri6133 10 месяцев назад

Part of the problem with non aircraft specific engines is the crank speeds. They need a gearbox which offsets some of the weight saved on a lower displacement. Another issue is how enthusiasts assume the specific power and efficiency are one in the same. While bmep is not exactly efficiency it is often related, but it is only part of the specific hp rating which also involves crank speeds. The thing is that old 2 valve combustion chambers don't actually make aweful bmep or bsfc. Bsfc has more to do with range and required fuel so that's part of the complex balance and bmep is part of torque which has to do with turning a prop. It's entirely possible that once you sort through gearbox losses aircraft balance, prop selection and the fuel capacity and range that the effects arent worth the extraordinary efforts except for the highest performance applications where the higher pitched whine of a high output engine being bothersome is the least concern. Automotive and power sports engines do amazing things but if setup well old tech isnt always so bad. The small pistons of common i4 engines and centered sparkplugs can lead to a low emissions engine but low displacement has more surface area to volume so despite how well it burns may keep less energy in the cylinder and more in the cooling medium. This might help wirh nox emissions so its an easy choice for automakers. But for a high duty cycle application where torque is king then having a larger case to disipate heat on the outside while keeping more heat in on the inside with fewer moving parts does start to look like a good idea. So even if the traditional aviation engines seem like carryovers from the 1930's and the high level of development on auto engines could put them first the aviation engines with efi have nice developments like redundancy and CAN network telemetry compatible with avionics systems. It is nice to have something that feels like a package deal. Maybe its perfectly fine that the alternatives are kept for the experimental guys who can work on bare bones avionics and lean on thr engines dependability vs the guys who pay for aircraft maintenance having some aircraft specific redundancy and avionics specific features.

@timduncan8450 3 месяца назад

We should stay in touch. I work as an engine engineer but don’t get to do architectural things like you and this video discus. I’m convinced converting automotive engines with PSRU’s is the only possible solution to high cost aviation engines. The Lyconisaurus engines have and will slowly evolve but have never come down in price. My engineering and engineering experience is that trading the moving parts in a 4 cyl for a three with balance shaft is a good win. Balance shaft has no piston scoring, valve dropping, ring sticking bearing spinning, etc issues. Cutting those odds by 25% right at the dwg board is a good win. As you say getting back to larger cyl bore will help bsfc vs 4’s. The PSRU is a good compromise vs Lyconasaurus cost. They can be very reliable and though incremental, still make competitive system wt with aggressive downsizing/up-rev’ing and or boost. Turbo charging is a very natural choice for aviation, with excellent benefits. Of course it must be done with reliability, durability and $ efficiency. These latter hurdles have all been cleared by many automotive and some sport engines now. We just have to bring them all together and package for aircraft.

@ArneChristianRosenfeldt 3 месяца назад

I have read conflicting information about ceramic coating. A flat roof and a Hereon piston ( flat with firewalls ) let’s the fireball from one or two central spark plugs just reach all walls as the piston gains speed. So before a lot of heat loss, the heat does the work. Bore < stroke. The principal scales if you rev smaller engines higher. At least in the displacement range we talk about. Planes too small for 6 big cylinders running at max rev defined by combustion, should go electric/ sailing.

@chippyjohn1 Месяц назад

A gearbox for an engine that makes 200kw and revs higher compared to one that revs lower can be made lighter as the delivery of power is smoother. Look at a turbine transmission, they are considerably lighter due to their smooth torque. Engine efficiency can be greatly improved with the use of ceramics, steel pistons, quality oil, titanium, turbochargers, liquid cooling, composites, electronics. Automotive technology is far behind, and aircraft even further. Smaller lighter engines are far better for aviation even with a gearbox, especially now with modern ecus such as Motec. Even the simple use of a tuned intake for a certain rpm can give 5-10% power gain, but with a lower revving engine the longer it has to be which weighs more. Steel pistons are stronger, lighter and more thermally efficient than aluminium, but they are far more expensive to produce. OHC and multivalued use less power and allow for easier power by means of flow and cooling. There are so many ways an aircraft engine can be optimised, currently the only people that do it are in the experimental market. Big companies are trying to make profit, that is their goal.

@ArneChristianRosenfeldt Месяц назад

@@chippyjohn1 When I read this, I think about a two stage reduction gear, where the first stage is small and the second stage only deals with smooth power delivery. Turbos are better for cruise than tuned induction NA . Interestingly, a V12 Merlin has both: smooth power delivery, and too much RPM for the large prop it can drive. Why are there many V12 cars, but only a few V12 planes? Could even reduce displacement per cylinder to 0.5 liter like in a car.

@chippyjohn1 Месяц назад

@ArneChristianRosenfeldt There are many v12s used in experimental but they are less common due to the engine being less common, cost and power requirements. There is a company that modifies bmw v12s for the experimental as well as other v12s such as the RED. A 6 litre V12 petrol would be around 250-300kw naturally aspirated, there just aren't many aircraft in need of the power in the experimental area when the market is mostly around 75-100kw.

@charlesgraham9954 10 месяцев назад

thank u bro, i appreciate u taking the time to explain the differences between the inline and boxer engines, i know the time it takes to film and edit.

@georgejleonard9410 10 месяцев назад

Thx Jaco...great info and education at 05H00 in the morning...looking forward to my lunch on Thursday at FAKT...thank you for your time on this channel an safe landings

@LetsGoAviate 10 месяцев назад

It's a bit much for 5am 😆 but thanks and enjoy!

@apuwdm2 10 месяцев назад

Very well researched video. Thanks for sharing.

@MaestroAbar 10 месяцев назад

It seems like the natural progression of light aircraft engines are parallel twins, rather than inline-4s. There are inline-3s now a days that make nearly as much if not more power than slightly older generations of inline-4s.

@Heatherder 10 месяцев назад

There are a lot of advantages to the existing lycoming/continental designs over automobile style engines. One is pressed together cylinders - no head gaskets to fail. Individually serviceable cylinders is another. Ease of packaging and maintenance, and lots of anti-fatigue features considered in the design. Redundant ignition as well, and provisions for oil pressure driven constant speed prop hubs rather than electric ones. These engines are also already capable of quite high thermodynamic efficiency. With modern techniques such as studded and doweled case halves I really see no need for the basic engine planforms to change. FADEC would be a welcome change, as long as it has commensurate redundancy, and backup for complete electrical failure, but even then is it so necessary? These engine operate with only a handful of different power settings and have a very consistent load. Ive never struggled to maintain good mixture control in my airplane. Timing adjustment is cool, but remember that part load efficiency is more important in a car than it is to an airplane (timing is set for optimum at high power). Individual cylinder fuel trimming would also be great, that one could probably help. Valve timing change is pointless as are many of the other efficiency workarounds such as Atkinson engines and cylinder shutoff. The prime directive is to keep it simple, and that’s the best thing about airplane engines as they stand right now. No need for extra cams or head gaskets or water. Automated cowl flaps to prevent shock cooling and necessary drag would be nice though.

@UguysRnuts 10 месяцев назад

It's my understanding BMW built a corporation on their inline six engine, first for Biplanes, then "Bimmers". Perhaps a one litre straight six, like the one in my '79 Honda CBX might make the most of the output vs height trade off? Sky's the limit on what "can" be done if price is no object which does make repurposed automotive engines the way to go. Thanks for updating my awareness of how A/C form following function is affected by modern engine alternatives.

@BlueMax333 11 месяцев назад

well researched!

@SoylentGamer 10 месяцев назад

While balance shafts prevent driveline vibrations from destroying the engine block and making noise, they don't solve the inherent problem of driveline vibrations, which translate to extra torsional strain on the prop.

@ArneChristianRosenfeldt 3 месяца назад

So 3,5,and 6 is better than 4?

@mrofnocnon 10 месяцев назад

Thank you, well explained.

@zopEnglandzip 10 месяцев назад

Blackburn cirrus was probably as popular as the DH engines for a while. Like for like a boxer should be lighter, due shorter crank. Had to stop an oil leak on a Porsche swapped mooney that dropped in, customer was generally upset with his life choices and believing an increase in hp meant increased performance, the words of Burt Rutan come to mind when the subject turns to fast revving low displacement engines. "Hp sells, torque propels" And of course a lyco/conti can sit at 75% power for days, not so much with small high output engines.

@bakters 10 месяцев назад

" *Hp sells, torque propels* " It's true, when designers deliberately build an engine, which delivers max power right at the redline, with no usable powerband. They basically gamed the system. No wonder it didn't work too well. Ease up a tiny bit with the resonances, you lose a few horses at the redline, which you couldn't use anyway, but gain a huge bunch all over the powerband. Max torque remains the same, but suddenly it all works 100% better. " *75% power for days, not so much with small high output engines* " That again depends on how you build the engine. Low revving truck engines very often suffer a lot in racing, because they have long stroke and high piston speeds when operated close to the redline, while smaller, revvy engines do well. Short stroke, low average piston speed. Current bike engines are built for that regime. 200 horses you can easily lift yourself, together with the gearbox! BTW - the main reason why 4-cyl engines have relatively low displacement is the optimum combustion chamber size. It makes little sense to go much above 0.5l per cylinder.

@peterlastrucci324 10 месяцев назад

Very interesting and well presented!

@LetsGoAviate 10 месяцев назад

Thanks!

@markmark5269 10 месяцев назад

Small correction: The Aeromomentum engine is not "double overhead cam", it is based on the Suzuki G13B single overhead cam engine (but 4 valves per cylinder).

@LetsGoAviate 10 месяцев назад

Interesting. Their website says the AM15 is SOHC, but they clearly state the AM15T is DOHC. But definitely does look like a single cam looking at the pictures/photos.

@markmark5269 10 месяцев назад

@@LetsGoAviate I not only know the G13B inside and out, I also live in China and know where Mark buys his engines and components from here. Though note that Mark and his team modifies and builds them completely by hand in the US to their own specifications.

@chrishenniker5944 10 месяцев назад

@@LetsGoAviateMakes sense in a small hot rod.

@mikepowell3335 10 месяцев назад

The AM20 is a 2-liter Mitsubishi Evo engine. One video where Mark describes the engine says they develop as much as 409 hp in stock, production configuration. The EVO is the only engine I found to do so -- and the manufacturer's claim of 409 hp matches what Mark said in the video. Don't know if there are any of these flying, though.

@chrishenniker5944 10 месяцев назад

@@mikepowell3335 I’d love to see one in a Ford Pop.

@andremarais2706 10 месяцев назад

Thank you. I really enjoy your content.

@robinj.9329 10 месяцев назад

THANK YOU 😊 I found this more then just "interesting"! With the very HIGH prices of modern Turbo-prop engines, I've often wondered just why we haven't seen light "Executive" transport aircraft powered by an "Inverted V-type" engine, al-la WW2 Fighter! A pressurized Twin, with two 500 h.p. inverted-V engines could favorably compete in the market place with many smallish Turbo-props ! I've even done a few initial design sketches! Twin, 500 h.p. engines. MUCH less expensive then todays light turbines! At a total of 1,000 horse power. And with a gross take-off weight of 10,000 or 11,000 lbs.

@tankermottind 10 месяцев назад

In this case, why not just do the same thing that has been done with the Viking engines to an automotive V8? Maybe use Chrysler's 700 horsepower, 6.2 liter turbo Hemi?

@AZREDFERN 10 месяцев назад

The Germans mounted their massive V-12s upside down for most of WWII. Primarily for visibility, but it also made basic maintenance easier since the top of the heads were accessible from the ground. An I-6 has perfect primary and secondary balance. The other benefit is its the only layout that can be multiplied at any angle and still remain balanced. That’s where the V-12 came from, and they can be made anywhere from 180° to 30° V angle. It would be neat to see a miniature V-12 used on light aircraft. BMW still loves it’s I-6 engines, and is the only company making a 1.6L I-6 motorcycle. That’s only one step away from making a 3.2L V-12. And one more step away from aircraft tuning it for a medium aircraft. Another layout oddity is the 90° V-2. Inertia is always delayed by 90°, and the V-2 can be surprisingly smooth with a 270° firing order because of it. Making another possible ultralight.

@LetsGoAviate 10 месяцев назад

It's like you're in my head. Don't blab all my video ideas out like that 😆

@chippyjohn1 8 месяцев назад

A 60 degree V12 is still the most ideal bank angle with consideration to firing order. A 90 degree V12 will have uneven firing intervals making it not as smooth. I was thinking about a 3.2 litre V12 from bmw engines for a long time also, I'm sure many have.

@AZREDFERN 8 месяцев назад

@@chippyjohn1 I always wondered that. I’ve heard you can make a V12 at any angle, because it’s essentially 2 perfectly balanced engines. 90° is generally a good angle because inertia is always 90° behind. Just time the tro banks 270° apart like a balanced V-twin. But if they share the same crank, I guess firing order would matter as a whole. Modern V-12s kinda settled on 60° for a reason I guess. Probably because it’s a square of 2 I-6’s and 2 V-6’s.

@chippyjohn1 8 месяцев назад

@@AZREDFERN 60 degree for a V12 is ideal because there is 60 degrees between each firing of a cylinder with 12 cylinders. A V6 is 120 degrees, v8 90, v10 72 etc. For mass production, engines such as mercedes truck engines are all 90 degrees regardless of cylinders for the ease of manufacturing. Other considerations such as a 120 degree engine being very wide and a 60 degree engine is quite tall. Even firing means even stress on crankshaft and drivetrain. If uneven, the crankshaft experiences higher fluctuations in stresses rather than a more continuous application.

@jiroyamamoto2878 Месяц назад

@@chippyjohn1 The World War 1 American Liberty engine was a 45 degree V12. The crankshaft had common journals for the pairs of connecting rods. It had crankshaft resonance problems due to uneven firing.

@RichardLewisCaldwell 4 месяца назад

7:45 You could handle secondary balance issues through complexity, but there is another way: an extremely slanted (120 degrees to 170 degrees) slant four with highly oversquare pistons and 3:1 rod to stroke ratio. You see, long rods essentially eliminate secondary imbalances (which is why container-ship engines have them), the oversquare pistons reduce the stroke so 3 times the stroke isn't insane, and the orientation keeps the total height reasonable and about the same and puts the prop only a tad lower. The offset to one side provides interesting opportunities and issues... Thanks for prodding me into thinking of this. Thumbs up.

@riverrat4631 10 месяцев назад

UL Power Aircraft Engines with Air-Cooling, Direct Drive and (FADEC) systems. It comes in horizontally opposed 4 & 6 cylinder models. Excellent power to weight ratio with Dual Electric ignition. I don’t believe they are certified yet, but working on it. I know guys that fly behind the 130hp UL Power in the LSA category and it will just hang on the prop in a 700-800lb Aircraft. They are great for STOL work. And you don’t have to worry about coolant like the Rotax. Very simple and clean install.

@jacobmoses3712 10 месяцев назад

There are some excellent diesel engines now being used in aviation. Some Mercedes diesels are now being used. Diesel's advantage is they run on Jet A1 instead of Avgas, which is getting scarcer

@Conservator. 10 месяцев назад

9:09 But not displacement but power is the goal. 2 liter inline 4 engines can quite easily produce the 180 HP of the Lycoming 5.9 liter. 2l engines would however typically produce peak power at around 6000 rpm so for aviation purposes that would require a reduction gear. That gear could be used to lower the engine so it would suit two purposes. As explained here: 15:10

@ericbucher8636 10 месяцев назад

Great Vid.

@davidrussell8689 10 месяцев назад

Fantastic video . Well explained and relevant info . Any thoughts on the AE300 engines that Diamond uses ?

@LetsGoAviate 10 месяцев назад

Thank you. The diesel Austro engines plays perfectly into the strenghts of the Inline 4 (not surprisingly, it's based on a car engine, after all). 2L displacement, relatively low rpm (less than 4,000) so secondary imbalance would not be an issue, but still requires a propeller speed reduction unit (gearbox) so they can put the prop shaft/hub at exactly the desired height. I'm not overly familiar with them but from what I've they are great engines.

@Itsjustme-Justme 10 месяцев назад

There is a second reason for the choice of engine design, that has nothing to do with the engine itself: The shape of the engine has to fit into the shape of the airplane to get a low drag and pleasing looking design. Knowledge of aerodynamics has greatly improved in the mid 1930s and made another giant leap during and right after WW2. Before, aerodynamics were thought simple. Designers concentrated on keeping the frontal area of their designs as small as possible and mostly ignored other factors. A wide fuselage was considered a high drag design. That's why side by side seating (not only) in light aircraft was very rare until the late 1930s. The narrow surface area of inline engines matches narrow fuselages perfectly. When the first purpose built horizontally opposed aero engines emerged, light aircraft with side by side seating were still rare. This lead to odd looking designs with narrow fuselages and cylinders protuding out of the cowling sides. You can see it on early Pipers for example. The shape of the engine didn't match the shape of the fuselage, it screamed drag and it always looked like an improvised design choice. Only when side by side seating was widely introduced in light aircraft, the horizontally opposed engine immediatelly kicked in. It was a perfect combination from the very start. Today, the vast majority of light aircraft with more than one seat are side by side designs. This combination allows for a low drag cowling and fuselage combination and, keeping hard technicals terms aside, a wide, short, horizontally opposed engine on a wide fuselage is just as pleasing to the eye as a long, narrow inline engine on a narrow fuselage. Looks sell, people don't just buy for technical reasons. That's especially true for expensive luxury items like private airplanes.

@grantfuller2016 2 месяца назад

Converted car engines have the huge advantage of being manufactured in the millions ( lots of availability of parts / core engines etc ) , a specific plane inline 4 would not have that . Was watching a racing boat a few years ago that had blown up its engine the day before ( a Honda engine ) . It was very fast and its owner told me it wasn’t going bad for an engine that was in a crashed car just two weeks earlier .

@sammcbride2464 10 месяцев назад

If you notice, that Gypsy engine is a "Long Rod" motor. Not a stroker, but a Long Rod. Look how insanely long those cylinders are compared to something you see in a car @11:30. This reduces the angles from side to side of the piston rod when the crank is in the middle of a stroke. It also reduces the need for a counter balance and reduces the acceleration effect of the piston during a stroke. This should be mentioned.

@PistonAvatarGuy 10 месяцев назад

It is a long stroke engine, but that's just because they didn't know any better in the 1920s. By the mid '40s, engine manufacturers knew better.

@sammcbride2464 10 месяцев назад

@@PistonAvatarGuy nope. There is a resurgence of long rod…not long stroke motors.

@PistonAvatarGuy 10 месяцев назад

@@sammcbride2464 In aviation? Long rods are definitely preferable, but long strokes are definitely not preferable in aircraft applications.

@sammcbride2464 10 месяцев назад

@@PistonAvatarGuy I don't know, but if you are only turning 2500 RPM and want no vibration, I would pick a long rod stroker engine for it regardless if it was in the air, on the ground, or on the water.

@sammcbride2464 10 месяцев назад

@@PistonAvatarGuy In any motor application, if the stroke is longer than the bore width, then it is a stroker engine. That is different than a long rod motor where the stroke is still shorter than the width of the bore. If you have the measurements of the engine, it will be easy to tell. On a side note...I don't know about you, but I would always want a dry sump oil system. Some people like to fly upside down. ;)

@centheiatrust9153 10 месяцев назад

You have overlooked one MAJOR advantage of using an inline 4 automobile engine. And that is full digital control. This results in far better fuel economy, eliminates carb icing, and eliminates hot starting problems of fuel injected aircraft engines. It also gets right of having 2 magnetos and spark plugs with smaller air gaps that can clog easily. Not mechanical moving parts in the ignition system allows for full, real time spark adjustments for best engine performance. And, their TBO can be much higher. How many aircraft engines do you know of that can go the equivalent of 200,000 road miles without engine failure?

@mikhailjairnisbett441 10 месяцев назад

Fuel injected computer controlled boxer 4s exist too though.

@richspillman4191 10 месяцев назад

There was a video recently on a "Scotch yoke" engine that claimed to do well as far as secondary balance and weight, this video made me think of that technology as a solution.

@LetsGoAviate 10 месяцев назад

I think it's the Alfadan engine? Yeah it completely solves the secondary imbalance issue as the conrod doesn't go from side to side and thus doesn't change it's relative length. It's all theory though until it is in production.

@montecorbit8280 10 месяцев назад

At 8:54 In line 4 displacement.. You were talking in automotive terms. I have seen truck engines that were larger than 4 l iters that were four cylinders.... They used to be quite common back in the day.

@LetsGoAviate 10 месяцев назад

100% correct, since I was leading the video to car engines converted for aviation, as well as just covering the basics of the secondary imbalance. The truck engines are like the 6.1L airplane engine I spoke of, in that they are low revving, which is why they can be that large.

@montecorbit8280 10 месяцев назад

@@LetsGoAviate I think a couple of them we're two stroke diesels as well.... Going to do one on six cylinders?? I seem to remember the Junkers of WW2 fame had an inline 6 burning diesel.... There is a lot of boxer sixes as I remember. Are there any boxer 8s?? Inline sixes are inherently balanced usually, primary and secondary are both balanced.

@LetsGoAviate 10 месяцев назад

Oh yeah for sure. Theres also the Gipsy inline sixes, not to mention the plethora of boxer sixes. The legendary Mike Patey's plane, "Scrappy", is powered by a Boxer 8.

@montecorbit8280 10 месяцев назад

@@LetsGoAviate You going to do videos sixes and eights??

@LetsGoAviate 10 месяцев назад

@@montecorbit8280 Yeah planning to

@NICK-uy3nl 10 месяцев назад

IF you are going to replace the boxer with an inline engine, it has to be a DIESEL to justify the expense and complexity with lower fuel cost (almost half) and lower specific fuel consumption of diesel cycle, otherwise, there is very little to be gained by the conversion - not including the huge expense of engine certification.

@jacoscholtz2716 11 месяцев назад

Great video thanks. Back in 2005 or so I was at a microlight airfield in Moscow, and present was three different manufacturers of trikes mainly geared for crop spraying. One company used a converted Suzuki 3-cylinder engine, and the other a converted Honda Civic 1.6L (it was a massive trike). I cannot recall now who did the conversion but will try to find the details and share it here. My friends convinced the owner of the big trike to allow me to fly it, on my behalf. I declined, but asked if I can be taken for a flip in this thing. Their test pilot took me up. It was the ride of my life.

@Romans--bo7br 10 месяцев назад

@jacobscholtz2716...... You said, quote.. "present was three different manufacturers of trikes...". You only detailed, Two.

@jacoscholtz2716 10 месяцев назад

@@Romans--bo7br Hi. The third one is the state university for microlights in Moscow. They manufactured the Poisk microlight and they used the Hirth engine. The Hirth is the German version of the Rotax, but I think it was also manufactured under licence in Russia (or probably Ukraine). I got to know them because I bought a Poisk from Oleg Alekseev who used to live in Cape Town, and he was friends with the guys who manufactured the Poisk. Oleg unfortunately passed away in his new Poisk at the Saldanha airfield and I heard most of the Poisk manufacturing crew died together in a helicopter accident.

@Romans--bo7br 10 месяцев назад

@@jacoscholtz2716... Hi, and thanks so much for your reply, I appreciate it. I've heard of the Hirth engine at some point in the not too distant past, but never really looked into it. WOW!!.... what sad news in relation to the crew from Poisk... very sad to hear that!! How long ago, or how recently did that happen?? When you mention Moscow.... are you referring to Moscow, RU. or Moscow, PA. ??

@chippyjohn1 10 месяцев назад

The reason air cooled is more popular is because of history and how aircraft are designed. Glycol was not common, not even in cars, seals have come a long way, radiator materials and assembly. Air cooled engines are actually heavier, aluminium cooling fins are heavier than coolant. plus you have ducting and increased drag from cowling. Aircraft are still designed around aircooled engines because that is what is commonly made. Lycoming, Continental and Rotax are all old. A 4 cylinder boxer engine is also not perfectly balanced, it experiences a rocking effect which causes vibration due to offset pistons. The use of multivalve and liquid cooling also allows you to run higher power safely due to less heat so their power to weight is higher yet again. Multi valve is not just about flowing more air, but better cooling for valves through the seat and valve stems. Bucket style lifters naturally rotate valves where as rockers do not. All of these air cooled dinosaur engines have a magnitude of problems fixed in modern engines. the reason they make them is because people buy them, a company does not stop producing their bread maker unless they are forced to.

@fidelcatsro6948 10 месяцев назад

time to go back to 2 stroke simple aircooled boxer engines

@chippyjohn1 10 месяцев назад

@@fidelcatsro6948 2 stroke and air cooled is almost obsolete. modern engines are far better, just that people know little to nothing about an engine.

@Gopferteckel 10 месяцев назад

Coming from a family who operate Tiger moths and Austers, we never had issues with inverted Gypsy Major inlines.

@LetsGoAviate 10 месяцев назад

When the Gipsy was inverted, there was issues, inlcuding increased oil consumption. Those issues were solved in the 1940's though, so I'm not surprised you never had issues. I wasn't around back then, just going on what I've read 🙂

@Christopher-xd5in 10 месяцев назад

I'm a FAA A&P looking forward to one day earning my private pilot's. Huge love for GA and historical warbirds

@davidelliott5843 11 месяцев назад

The con rod angle causes pistons to reach mid stroke After 90 degrees. This causes a nasty vibration at 2x crank speed. Inverted two stroke V4 has very low vibration and direct injection run very clean and efficient. The Delta Hawk diesel is even better.

@user-in2lo4qs9b 11 месяцев назад

wonder if that helps lubrication of rings. gravity being your friend here. but mains?

@nerd1000ify 10 месяцев назад

The mains get plenty of oil from the pressure feed being sent by the oil pump, same with the big ends. Inverted cylinders tend to have issues with too much oil draining into the combustion chambers, especially when left sitting after shut down. This is why radials tend to smoke so badly on start up, oil pools in the bottom cylinders and they smoke until it burns off. Inverted inline or V engines usually use the rocker covers as sumps and have drains running from the crankcase to the cylinder head for this purpose, which might explain why they seem to smoke less than radials. But they will still burn more oil than an upright engine.

@BuzzLOLOL 10 месяцев назад

Ducati 90 degree V2 is so smooth you can't feel it running... inline 4 kinda sucks for every use...

@JunoSolarWinds 10 месяцев назад

Turbo rotary with reduction gear box would be cool

@Iowa599 10 месяцев назад

Instead of dry sump, when turning an inline-4 upsidedown, make the valve cover into the oil pan.

@fidelcatsro6948 10 месяцев назад

and risk an air crash? never!

@mpetersen6 10 месяцев назад

That was done on an inline inverted four that was introduced around 1940. Named the SkyMotor. Wrong time.

@Iowa599 10 месяцев назад

@@fidelcatsro6948 so…never fly?

@fidelcatsro6948 10 месяцев назад

@@Iowa599 now you talking like stockton rush.. see what happened to him amigo? 🤔

@Iowa599 10 месяцев назад

It's really a lower risk of failure than a dry sump system. It's basically the same, other than the evacuation system (pump, lines, tank) eliminated. I'd be concerned of the pistons acting like cups of oil, but since they move down faster than gravity, they empty themselves. You will (probly) need to add a crankcase drain, to drain the crankcase into the valve cover, but the factory equipment might work (if the OE drains work the other way) or require minimal changes (maybe PCV porting).

@grandyhynes1636 5 месяцев назад

Could you cover the pros and cons of radial engines please. Theorizing a 4 pot radial ....

@jiroyamamoto2878 Месяц назад

two stroke only with single row even number of cylinders unless you want major uneven firing intervals.

@deltacx1059 10 месяцев назад

2:21 sure if you are driving your prop right off the crank, aircraft engines are bespoke anyway so of you really want to you can make one driven off a gear or coupling on the head of the engine, it's not a hard problem to solve. 2:50 it can't but you also don't need a wet sump or a 4 stroke in general, a 2 stroke can do it just fine. They may have their own issues but if you really want a inline 4 and the same airframe as the boxer for some reason you have to make sacrifices somewhere. 3:49 gearboxes can be made quite light and if you are saving weight by using the inline than it shouldn't matter, it can even be built into the engine which reduces weight over a separate gearbox in theory. 4:20 this is why cooling ducts exist, yes more weight than without them but it works well.

@SpecialEDy 10 месяцев назад

Would it not be cheaper and easier to build a twin I4 design than to put a single $20k-40k engine in the nose? Im an industrial mechanic, i used to work on a lot of forklifts. Many LP forklifts use automotive V6 or I4 engines, they are just derated in power and otherwise improved in durability. Forklift engines typically have a 500 to 1000 hour oil change interval, just like Aircraft they are usually run at maximum engine output for hours a time.

@optiondrone5468 4 месяца назад

Hey, man! Your explanation of the pros and cons of inline 4 vs. boxer engines was really good. I've been considering the Pipistrel Virus plane, which is designed for the Rotax 912 and 914 engines. Do you think there's a suitable Viking engine that I can use for the Pipistrel Virus plane? This might be a dumb question, but I wanted to throw it out here to see if there's any good explanation.

@LetsGoAviate 4 месяца назад

Thanks. Not a dumb question, but I don't have a great answer. Without double-checking all my facts, Pipistel suggests only the Rotax engine for their planes, and I've not seen one powered by anything other than the Rotax (excluding the electric). While surely not impossible, I think it will be difficult using something other than the Rotax on the Virus, unlike your kit plane bush planes which are designed with many different engines in mind, I think the Virus' cowl/frontal area will be limiting. For this plane personally I'd look for a used Rotax 912ULS/iS

@optiondrone5468 4 месяца назад

@LetsGoAviate I actually looked at bush planes. The problem was I couldn't find one suitable for UK CAA or EU EASA. I like the Bearhawk B4, but I don't think I'm allowed to fly it in UK skies, something to do with the airframe. I also looked at the G1 Aviation French company because I was told it can take the Yamaha Apex engine. It is so difficult to get a plane with 2 to 4 seats in the experimental class with good load capacity. The only reason I like the Virus is that it's an easy plane to fly, and it also has a good glide ratio and cross country capable. Thanks for your reply.

@mariobras167 5 месяцев назад

Many years ago the very reliable Honda designed IT engines with dry sump for their Civic and Accord cars, so many companies use them for light experimental A/C's with powers station me 150hp and adapting double electric circuit for redundance safety, propellers attached with reduction gear due to higher engine rotation against better 2,2-2,7k rpm fir propeller so tips don't achieve supersonic speed increasing drag and vibrations

@moviemenia9276 10 месяцев назад

Maybe No one will design an inline 4 engine for aeroplane... But you can use a suzuki hayabusa engine for an aeroplane.. this engine is so reliable and balanced... And also powerful.. i have done some research about that.. not too much research.. but i think this engine is better for aeroplane

@louisvanrijn3964 10 месяцев назад

This video sums up several differences between boxer and in line engine (everyone knows) Three major facts are NOT mentioned. -1. Car engines have far, far lower loading spectrums compared to aircraft engines. Do you apply full power for several minutes after driving away? (the take of is mentioned) and 85% power for many other minutes (climb-out) "This car-engine is good" (if you use it only up to 30% power AVERAGE in a car, then it is true.) 2. An ordinairry aircraft engine has everything vital double and also independently. Double ignitions, double fuel pumps etc. 3. The certification cost are extremely time comsuming and expensive. From every engine part the complete history of the metal (back to the mill) has to be cleared, described, frozen and cannot be changed after certification. No car engine complies to that. That are the reasons you see only a few car-based engines.

@andypdq 3 месяца назад

One thing that really worries me about automotive i4s, belt or chain timing drives. Gear train timing drives are what's needed for ultimate reliability.

@ArneChristianRosenfeldt 3 месяца назад

So many videos on RU-vid show straight gears in Diesel engines. Why not use those (truck?) engines? I think I figured out: those large idler gears only need to be quite thin for their load, but then you cannot put a helix on them. Teeth get loaded quit instantly on engagement. Why not use a vertical shaft as on some bikes and old Porsche?

@jaromirandel543 10 месяцев назад

It is almost like reinventing the wheel. Superchargers and the turbochargers are nothing new. Even in aircrafts. Those used to be used in many aircrafts, specially in WWII era. I think the main difference is that high power piston engines were substitued by turbo-prop engines and the "low power" engines kept conservative way.

@crono331 10 месяцев назад

Boxer has shorter crank and camshaft, which are very heavy components.

@phantomforester9337 10 месяцев назад

Why not use the camshaft drive in a purpose-designed ohc inline 4 aircraft engine to drive the propeller? That would not add the complication of a separate gearbox (though the drive would have to be sturdier), there would be an automatic 1:2 speed reduction for the propeller (or even 1:4, if you used double-lobed cams on the camshaft), the engine would be upright and could use a wet sump system, and the propeller drive would be at the top of the engine, providing the desired thrust line and good propeller clearance. The propeller doesn't care if it is being driven by the crankshaft or the camshaft. A conversion kit might be designed for an ohc automotive engine to do this as well. Just a thought.

@LetsGoAviate 10 месяцев назад

My first thought was that the camshaft would need to be seriously sturdy, but you did point that out. Also you would end-up with a belt or chain driven camshaft in turn driving the propeller. Not an issue per-se, there are belt driven propellers in the ultralight world (as propeller speed reduction instead of a gearbox), but the belts are about double as wide as a normal cambelt. But if you are going that route, might as well just belt drive the propeller hub from the crankshaft, rather than belt driving the camshaft which drives the propeller hub?

@phantomforester9337 10 месяцев назад

@@LetsGoAviate Well, that would still duplicate the drive--you would have two drives, one to the camshaft, and one to the propeller, each with a gear reduction. The old Crosley COBRA and CIBA engines had a shaft drive to the camshaft, which would have been very sturdy--maybe extra bearings would be all that would be needed to convert--or, a bespoke shaft drive to the camshaft and propeller could be a simple drive that would perform both duties easily, without too much bulk. Even if you use just a belt, driving the propeller off the camshaft drive would save an extra set of reduction pulleys, as well as the belt. It would be lighter and simpler than two separate drives.

@phantomforester9337 10 месяцев назад

@@brianb-p6586 Thank you. Okay, an idler gear would be needed. That still strikes me as being less complicated, lighter, and less bulky than a separate propeller drive. Also, there are twin-lobe camshafts that are driven at 1/4 crankshaft speed. The propeller could be more geared-down than 1:2, allowing for even higher revs for the engine, increasing power and efficiency, while still not needing a separate propeller drive. And perhaps a belt drive would avoid gear teeth wear issues, particularly with 1:4 drive. I am sure there would have to be some development time before an ideal arrangement could be worked out.

@PistonAvatarGuy 10 месяцев назад

The Continental Tiara engine did something like this.

@phantomforester9337 10 месяцев назад

@@PistonAvatarGuy Thank you. I Googled it--that engine purportedly had high fuel consumption, and did not have a sufficient performance advantage to justify its expense. The concept was to use the camshaft drive to allow for higher rpms, and more power, without a separate reduction gear. A hydraulic "Hydra-Torque" drive was used to reduce shaft vibrations--which could also be used here. Apparently, an extra idler gear was not used--maybe the Hydra-Torque drive negated this need. But the engine was of conventional flat-opposed configuration--it did not use the cam/prop drive to have a cheaper upright inline engine with smaller frontal area. And, it had a 1:2 reduction--it did not use a 1:4 reduction double-cam-lobe. On top of all that, it was in a higher-power engine category, not a small, light engine for minimal aircraft. Perhaps the upright inline 4 with a combined cam/prop drive could still find a place. The smaller engine could rev higher, especially with a 1:4 gear reduction, the lower frontal area would help fuel consumption, especially in a tandem-seater, and investment costs should be lower than with a bigger opposed-six. And the Hydra-Torque drive has already been developed. Just tossing the idea around, to see if it has validity. Thanks for the information.

@bierce716 10 месяцев назад

Seems to me that all the issues you mention with the online four were solved more than a half century ago with the Meyer-Drake Offenhauser engine. It only won the Indianapolis 500 27 years in a row, and took the entire front row ten years in a row. Even naturally aspirated, it could make 770HP, and went over a thousand with turbocharging.

@LetsGoAviate 10 месяцев назад

Thanks. I had to go look it up. I don't think they solved anything related to secondary imbalance, but really sturdied up the engine like crazy, so that the imbalance really doesn't affect it like it affects a normal production engine. I'm thinking, why is this not in any production sports cars? And why has it not been used in aircraft? I don't know the answer but I'm guessing it's relatively expensive and/or expensive to maintain in a daily use (non-racecar) vehicle due to it's much different design and assembly methods. It also looks like they are heavy, some in excess of 400lbs. Again, I don't know all the facts, I'd need to research it more, but there is a reason it isn't being used in much other than racing cars. Awesome discovery for me though, so thanks!

@bobwilson758 10 месяцев назад

Yes sir ! Indeed - how soon some narrow minded people forget what you said ! I only worked with one old offen - Awesome unit ! I was a young mechanic and into big block Chevrolet mark lV engines at the time , However - Like you said , non turbo offenhauser … Actually scared me … at first anyway . Please excuse my spelling Thank you sir !

@DirkLarien 10 месяцев назад

so from this intresting video i was led to one about INNengine. Looks Interesting for aviation. Small size low weight not many moving parts this all smells of perfect fit. Any thoughts ?

@coreyfro 6 месяцев назад

I am wondering if the Duramax LZ0 would make a good aviation engine. It is competitive with the Lycoming 580 in power to weight ratio, it is diesel which is more fuel efficient, and as an inline 6, it has perfect balance, primary and secondary. The disadvantage is length and verticality. But as a 3l diesel, this might be slightly mitigated

@jpdj2715 10 месяцев назад

There's a "big" difference between "boxer" (4) and a "flat" (4). That's in the motion of the pistons and how the pistons are connected to the cranks on the crankshaft. In a boxer engine two "opposite" pistons have their own individual cranks and the way this is timed is that the two opposing pistons go in opposite direction at exactly the same time. When one piston moves away from the crankshaft, the other does so too. In a flat engine, two pistons share one crank on the shaft and go the same direction. These differences have serious impact on the natural balance or unbalance in the engine. The boxer simply is more elegant and AFAIK it is the boxer design that is used in aircraft ICE. The same difference may be observed in V engines, by the way. And you could compare the inline 4 with the boxer in this sense, only the inline 4 got folded into two by two at 180 degrees. When it comes to natural balance, an inline 6 may be the best, though, and I am not sure if that 6 folded open into a boxer 6 still has that quality. It's all in the timing of moving - accelerating and decelerating - masses. That said, yes, why not an inline 4 (diesel) in a small aircraft. Car tech has made serious leaps ahead in the past decades and HP per cc (or ci) as well as HP per engine mass have been improved a lot.

@LetsGoAviate 10 месяцев назад

Yes and also, all boxers are also flat engines, but not all flat engines are boxers. Flat engines (that aren't also boxers) are not very popular due to horrible primary balance.

@jiroyamamoto2878 Месяц назад

@@LetsGoAviate All aviation flat 12s and H24's are common crankpin engines, 180 degree V12's is another way to describe them. The Porsche 917 12 and the Ferrari 512 were also common crankpin engines.

@danbenson7587 10 месяцев назад

Here are pros and cons unmentioned. Remember props turn < 3000 rpm 1. The I4 crank is longer which brings its the critical frequency closer to 3000. 2. In its favor, the I4 has 5 main bearings versus H4’s typically 3. (VW, Rotax, Continental, Lyc’s have 3, Subaru has 5.) 3. A direct drive I4 secondary imbalance is a non issue at 3000. Even a good possibility partial primary balance is workable. 4. Engine stiffness impacts longevity. Lycomings and Continentals flex because air cooling fins compels wider cylinder spacing. Moreover individual cylinder heads diminish stiffness. These engines compensate flex with sloppy clearances. 5. At 3000rpm, 2 valve pushrod heads work fine and lighter than SOHC or DOHC. 6. A Continental O-200 makes 100hp at 2800. Doubling the speed engine could make 200 at 5600, …1hp/cid. The point: these old engines are not all that bad. 7. Conceivably one could go to the hot rod parts bin and get a Chevy LS1 head, pistons, rods, valves mate to a custom crank and block for a 100hp engine. Check out the Crosley CoBra engine or blocks CNC machined from solid aluminum billets. It’s just time and money and imagination, …and grit Engines with Reducers. 1. In a 4 cycle engine, cylinder torque pulses don’t overlap until you get to 8 cylinders. With a 4 or 6, thru a revolution, the engine drives the prop, and then the prop drives the engine. These reversals are absolute hell on speed reducer’s gear teeth unless mitigated by a clever coupling such as the Rotax 912’s. (And Viking and AeroMomentum) Wider rpm band faster risks resonance. No easy solutions, but there are solutions. The certified aircraft engine market is small, maybe 2000 units per year worldwide, the entry barriers are prominent, and comes with 100’s trial lawyers. One sage commentator commented, it’s economics.

@LetsGoAviate 10 месяцев назад

Some of it is obvious, some of it is way more in-depth than I would ever cover in a medium-lenght video format, and some of it are great ideas for a future video. Thanks!

@danbenson7587 10 месяцев назад

@@LetsGoAviate FYI, Solid Works modeled auto parts (LS1) based 3000 RPM H-4 ~180 CID 5-bearing engine to check the weight. Projected to be heavier than an 0-200, but less than the 0-235. But such an FAA certified engine might cost the customer only $3000 on say a $30000 engine. 10% doesn’t justify the effort. Cheers D

@WilhelmKarsten 6 месяцев назад

You are clearly attempting to compare apples to oranges here... Automobile engines are not typically designed to meet the rigorous demands of aircraft applications... and as such are built to a price point that reflects these much lower automobile requirements. The notion of a $3,000 dollar type rated aircraft engine is not just wishful thinking it is pure fantasy son.

@MigotRen 7 месяцев назад

now i wanna see or rather hear an inline 5 in an aircraft

@peceed 5 месяцев назад

I started to think that sleeve valve engines would be very interesting - they should decrease size of heads.

@recoilrob324 10 месяцев назад

Weights are added to compensate for the pistons stopping at each end of the stroke. This is primary balance. Those same weights now have nothing to counter them when at 90 degrees so they impart energy laterally. The mumbo-jumbo about the minute difference in the mathematical travel of the pistons ignores the obvious weights doing their thing.

@PeterEmery 10 месяцев назад

I believe the high oil consumption of the de Havilland Gypsy Major inverted four cylinder inline engines was solved by improved piston rings.

@milenaresources4244 11 месяцев назад

This explains a lot about the popularity of small automotive engines...and raises interesting questions about the 3 cylinder engines. They must be full of vibration. Maybe that's why they are not expected to last more than 100,000 miles. And...this business about turbo...I can only imagine the cooling problems. Hot, vibrations and high rev. seems like a recipe for obsolescence. The video offers good mechanical info.

@LucasChoate 11 месяцев назад

I was thinking the same thing. My Triumphs have 3-cylinder engines (Speed triples, Daytonas) and only displace 1050-1200 cc. They make 130HP at about 10.7k rpm and can run in that range all day long. But, they hit all his points, complex (with balance shafts, water cooled) and would require a gear reduction to get the prop down to reasonable speeds.

@LetsGoAviate 10 месяцев назад

3 cylinder engines are interesting. I plan to cover it in a video the future, as a 3 cylinder car engine will now be converted for Aviation by a prominent company.

@chippyjohn1 10 месяцев назад

@@LetsGoAviate You are talking about Viking again. Looked at the Chevrolet trax engine, it is not suitable. It has a 90 mm stroke for one.

@LetsGoAviate 10 месяцев назад

@@chippyjohn1 Yes that's the one I'm referring to. Interesting enough for me to consider exploring it in a dedicated video.

@chippyjohn1 10 месяцев назад

@@LetsGoAviate Go for it. Even if you receive negativity in the comments, at least you are making a video about these topics, I applaud you for that. We do need people to push the boundaries of aviation like Viking and Aeromomentum. I just see red flags with viking. All the best.

@Archpimp 10 месяцев назад

Good video. We don’t need a custom purpose built aviation engine. I don’t think the economics exist. We need a cheap, safe, standardized FAA path for converting auto engines to aviation engines. Then we need the same path for swapping engines.

@michaelbuckers 10 месяцев назад

Cars (mostly) use inline engines because there's strict limit on engine width but not so much on engine height. The driveshaft location isn't important because cars must use a gearbox anyway. Cars don't drive fast and the bonnet space is super cramped so airflow is always poor, any car engine with more power than a lawnmower needs liquid cooling anyway.

@MISTERLeSkid 10 месяцев назад

This was cool but unless I missed it, you never explained how the secondary imbalances cancel-out on the boxer. I still don't see why that's sorted-out compared to the I4. Good video though - you explain well. Cheers.

@LetsGoAviate 10 месяцев назад

Yeah I didn't cover it in-depth. Because the conrod goes sideways as it goes around the crankshaft, it becomes shorter (relatively speaking) vertically, and pulls down the piston more at 90° and 270° of crankshaft rotation. This additional pulling down of the piston causes acceleration and decelleration of the pistons (in the normal "plane" of movement). At 0-90°, 90-180°, 180-270° and 270-360° degrees of crankshaft rotation, the pistons accelerates, decelerates, decelerates and accelerates respectively. This means the secondary imbalance's resulting force is in an "upwards" direction, upwards being towards TDC. So the reason the boxer 4 can cancel out secondary imbalance naturally is because the pistons face in opposing directions, and each bank of 2 cylinders cancels out the imbalance on the other bank of 2 cylinders, as opposed to the inline 4's pistons all facing in the same direction. There's more to it, but that's the basics.

@marjoh669 10 месяцев назад

Not gonna lie, I thought I clicked on a Driving 4 answers video😅😂 Still, I enjoyed it a lot! Thank you for making it🤗

@LetsGoAviate 10 месяцев назад

😅😆 thanks!

@coreyfro 6 месяцев назад

Talk about inline 6!

@sammcbride2464 10 месяцев назад

Ford made a 4L gasoline engine. It was only for Australia. There are so many big diesel engines that are 4 cylinders, I cannot count. Buses, Semi's, etc. The Porche 3.5 liter motor in the 928 was a very smooth engine. The balancer that you are describing is actually called a counter balancer for some reason. I believe the reason the planes use boxers is that they are air cooled big 4 cylinder flat engines. No one makes them anymore except for Lycoming and they have a good reputation. It is simple, fits the air frame parameters, air flow is along the cowling, exhaust goes straight down and out to pipe, intake comes from the top...very simple. As for inline configuration of engines, the Merlin and Alison engines were both successful engines that replaced the radial engine during the war.

@UguysRnuts 10 месяцев назад

"In line" means a single bank.

@sammcbride2464 10 месяцев назад

@@UguysRnuts Not necessarily for this discussion. When it comes to this configuration, it is called a straight-whatever. Some argue that a V12 is 2 inline 6s mated together. The arrangement though is inline as opposed to radial or boxer. I do agree that it is in a narrow V shape, but it was very narrow vs. 90 degrees and replaced a radial engine configuration of the time. The W configuration is also an inline configuration to me. It is being debated that if something that is not a boxer (or radial) can be used as an airplane engine. It is also stated that there are no big inline 4 cylinders in the automotive industry. This is just not true. If you wanted a diesel airplane with a big 4 cylinder and direct injection that turned at 2500 rpm, there are plenty to be had in the automotive industry with off the shelf diesel engines.

@PistonAvatarGuy 10 месяцев назад

@@sammcbride2464 The Cummins 4BT makes 170 hp and weighs about half as much as an entire airplane that would typically be powered by a 170 hp engine, that's never going to fly... literally.

@rederos8079 10 месяцев назад

I mean there have been quite some inline 4 and inline 6 engines that were in use in the sixties too. Zlin 26 line of aircraft uses a bunch of different inverted inline engines, and they I think have been fairly popular as aircraft, with seeing there were at least 2 or 3 in finland only. I'd guess in central and eastern europe the skies are still full of them. Looking at 1400 of only the 526 produced, with probably even more of earlier ones I doubt they would've died out. Earlier versions were powered with engines designed in 1920's and 1930's, but later ones were updated to more modern inlines introduced in 1960's

@julianizydorczak5258 10 месяцев назад

Zlins and walters worked great together

@B0RN2RACE100 10 месяцев назад

The opposite piston layout should be the best type of piston engine for this application, but I think someone tried and got shut doing for…(legal issues? Licensing? I don’t remember)

@dylanmorgan5589 10 месяцев назад

How about an inline 6 which is completely balanced?

@kellyaquinastom 10 месяцев назад

What about opposing cylinder motors? Achates?

@fidelcatsro6948 10 месяцев назад

thats UFO technology even car makers should adopt!

@WilhelmKarsten 6 месяцев назад

The Jumo 205 was very successful

@GoldenGrenadier 10 месяцев назад

Why not use inline 5 cylinder engines with a weighted propeller to counteract the rocking motion?

@tinolino58 10 месяцев назад

Correction: a Viking 130 with it’s gearbox is lighter than an corresponding boxer engine.

@johnburns4017 10 месяцев назад

But with power sapping gears and more to go wrong.

@RulgertGhostalker 10 месяцев назад

a high rod ratio ( 1.8 -2 ) Radial 3 can be perfectly balanced.....bore 108mm, x stroke 108mm, x 3 cylinders = 2.968 L , ( 3L for short ) Torque is a function of disparagement and BMEP, so add a turbo, and it would not need a gear box....( being able to function at much lower RPM ) air cooling would be even, so the addition of an oil cooling circuit could easily regulate the engine temperature from there. it would be the perfect pusher prop engine, ( if visibility was a problem )

@UguysRnuts 10 месяцев назад

And they look great!

@RulgertGhostalker 10 месяцев назад

@@UguysRnuts yeah, i think so too.

@grandyhynes1636 5 месяцев назад

Are radial engines better??

@brandonb417 10 месяцев назад

I'm curious what the reliability of some of these converted inline 4's is. There are some planes out on the market that need new engines, which makes them a very expensive buy since new engines are so expensive. But if you could hang one of these on it....

@LetsGoAviate 10 месяцев назад

I'm curious about the reliability as well. Not a lot of data out there, mostly just what can be found on forums.

@dima343. 4 месяца назад

Engine with bigger displacement and same power, all else being equal, would be less stressed, therefore more reliable, therefore more safe. And air cooling is more simple and there's nothing to break, works great for aircraft, but limits amount of boost, which can be applied to engine.

@gj1234567899999 9 месяцев назад

Won’t 4 cylinder inline engines still have the cooling issue though? Less airflow and more reliant on radiators etc?

@LetsGoAviate 9 месяцев назад

Liquid cooled won't as long as the radiator gets air. Aircooled can have cooling issues if the air ducting design isn't great. An airplane designed for the air cooled inline 4 (e.g. Tiger Moth) have taken the engine layout into account with cowling design, and thus doesn't have cooling issues. Put an aircooled I4 in anything else you'll likely have cooling problems.