Locking Blades - Turbine Engines: A Closer Look

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Installation of the turbine blade lock pins in the GE J47 turbojet engine.
To see the removal procedure for the pins...check out Jet Questions 48
For even more detail, check out "removing turbine blades from a J47" here:
• Removing blades - J47 ...

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23 июл 2024

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Комментарии : 320

@StonyRC 7 лет назад

Yours are amongst the MOST interesting and informative videos on all of RU-vid. Succinct and to the point with no unnecessary content. Many thanks.

@kevinolesik1500 10 лет назад

that is so cool ... imagine the heat and forces applied to those materials during operation ... thanks for the up close look at how this stuff goes together !

@yousafzaifrnd 5 лет назад

Excellent! you mean business. No extra music, nothing. I appreciate.

@vigneshk6320 4 года назад

Iv been searching for design details on jet engine for over a month now and the videos from your channel saved me a lot of time, "SUBSCRIBED"😊😊👍👍

@parsecpres 3 года назад

Amazing! Technical explanations while demonstrating practical application. I envy you in your vocation!

@oisiaa 13 лет назад

Another awesome video! You have no idea how much I look forward to each of these.

@2011dtish21 5 лет назад

What I would give for just a few hours of a macro shot of you working on installing blades. Boy. The most relaxing thing while working on projects late at night

@AgentJayZ 5 лет назад

I think you need to take the gearhead test...

@jaypearce6743 6 лет назад

I want to say "fantastic". You've got a great coping mechanism

@SPEAKERSRULEMYWORLD 8 лет назад

"actually the mop bucket wouldn't be there in operation" lol... good one

@jolietjake1970 13 лет назад

Keep up the good work and please dont stop bringing us these awesome videos!

@phillipolivarri1 5 лет назад

We apply Pt-al coating for the t56/501k stage 2 vane segments down here in Texas for Rolls Royce. That was really interesting to see the size difference between that j series and t56

@John6697 10 лет назад

I would never have thought of that trick. thanks for the responce

@56hueycobra 9 лет назад

You're Teaching ME Something I Did Not Know Sir!!!

@kkooloo5781 4 года назад

This guy makes super explained videos for the layman 🇬🇧

@BennyHeflinger 9 лет назад

Wow... these videos are great, thanks for sharing them!!! I hope one day it could be possible to make stage compliant commercial SST's...

@WasimAkhtaraircraftengineer 10 лет назад

Excellent work

@davidcircuity6473 9 лет назад

that is just amazing! you have a cool job. Thanks!

@AgentJayZ 12 лет назад

@343jonny Those are struts in the tail pipe, used for positioning the rear cone. The rear cone reduces turbulence in the exhaust stream by eliminating the step change from the annular shape of the turbine exit to the tubular shape of the jet pipe. The struts are airfoil shaped to reduce turbulence as the gases flow past them. They are replaceable, but not adjustable. Thrust-vectoring is a relatively new technology of flight engines, and we never see it in our business.

@FrontSideBus 13 лет назад

Letting you do these vids is good advertising, and it's working. If I had an engine that needed servicing, I'd want you guys to do it!

@zainahmed1994 7 лет назад

amazing...keep making such videos

@oddballlw 13 лет назад

Nice vid! Can't wait to see it run!

@SnimHD 4 года назад

I'm watching your videos and You are the best.

@TalksWithDirt 13 лет назад

You are the purveyor of North American turbine goodness to humanity!

@jimthompson129 9 лет назад

Excellent video!

@xnato-uq1tn 5 лет назад

Those lock pins are spring roll pins, which I've used as an auto and bus mechanic for decades. They look to be SS or better, very hard, strong, tough, doesn't like to deform. I am going to see if I can find a video that shows how you remove those pins. They are installed into blind holes, you can hear them clang as they bottom out in their holes. I'll bet it isn't easy. And these are the hollow types. There are pins that look like a lunch wrap, a tight spiral of SS or spring steel. I remember the pain of trying to remove those monsters. Cryo, perhaps? I'm keen to find out, if I dan.

@vigsara9183 4 года назад

Great videos and I expecting more from you.

@jacobg2296 3 года назад

Spins 4 times with a single push, those bearings are so perfect

@jrdeckard3317 3 года назад

You need dedicated roll pin holders and punches, as used in gun-making.

@bchokola 11 лет назад

I have to correct you, sir. I worked on C-130's for about 6 years. We used the T-56-A-15 engines which put out around 4,000 horsepower. If you do the math, 19,600 in/lbs at 13,820 rpm = 4297 horsepower. If you subtract frictional losses from the gearbox (13.54:1) , I wouldn't be surprised to see that you lose 100-200 hp at least! That being said, I really do enjoy your videos. I just so happen to be a specialist for one engine. You seem to know quite a bit about turbine engines in general!

@jessereiter328 8 лет назад

Older than I am and I am 60 . I worked APU s one was used to start the F4. The other ran Radar we would get some that had 40,000 hours on them, we would put new bearing and seals in them, ship them back

@AJKandK 11 лет назад

Ok got it. With the molds, tools & machines I design and build for a living I'm used to the hardened dowel and roll pins that are used. One would have to beat pretty hard to get them to shear & in the process destroy the blade and possibly the disk. The pins you're using, being a roll pin and probably a little softer allows it to fold over and shear with minimal persuasion. Trust me until being able to have you walk use through these engines, most things about these was a big mystery.

@PheloUre 7 лет назад

Excellent professor!! :)

@psycronizer 8 лет назад

Jayz those lock pins you have (we call them roll pins here in NZ) are what I used to rebuild the power-valves in my Suzuki RGV-250 N....and when done right they last forever and dont flog out a horrible hole...usually due to the difference in characteristics

@AgentJayZ 8 лет назад

+psycronizer A long way back, I rode a friend's RG500 Gamma. It was quite impressive,

@sgtjonmcc 7 лет назад

Wow just a standard rollpin retaining those blades incredible

@AgentJayZ 7 лет назад

The blade locks, whether pins or small metal strips have a very specific function, discussed in detail in other videos. It would not be correct to say that the locking devices "retain" the blades during operation of the engine, but in only a very small range of rotor speeds which are between being completely stopped, and turning just enough so centripetal force begins acting on the blades. Centripetal forces lock the blades into their mounts in the disk long before any aerodynamic forces are created which would tend to slide the blades axially in their mounts. The locking devices only need to be as strong as a paperclip, whereas the forces on the blade roots in their mounting slots during engine operation is equal to the weight of several full size pickup trucks for each blade.

@blackbirdpie217 6 лет назад

It's a little hard to get size perspective when we're looking at just the core of one engine and the entire housing of the other. But it likely is a big size difference. I think looking at the turbine disc was where the extreme size difference was more obvious. I am curious how much the sheer mass of that spool not only slows the acceleration but adds significant weight to the aircraft.

@AgentJayZ 13 лет назад

@MiG29MOVT The pins are destroyed in shear upon blade removal. The pins are then driven out of the hole in the disk... towards the hub. The blades are indeed ceramic thermal barrier coated. This can increase the temperature tolerance of these parts for increased performance or longer life, or both. The blades themselves are made of hi-temp alloys, like the blades in all jet engines.

@intellectracoon 6 лет назад

thank you sir your videos are great :)

@Jatin19902 9 лет назад

great work, post more.

@Windtee 13 лет назад

@AgentJayZ I enjoy your vids and all the extreme detailed close-ups of the jets. There's always something new to learn about every time. Oh, maybe a "female hand-model" pointing to jet-parts on an episode (as you narrate) would be a fun twist. ;) All the best to you and continued... jet-success!

@javierestrada6927 6 лет назад

This videos are great

@SuburbAllied 6 лет назад

As always im greatful for your interesting videos! You showed us how the turbine disk got cooled by air coming in through a center hole in the rear(?) cone. As I've understood it, it enters there, but where does the hot air, after it has cooled the disk leave, or exit? Is it through same pipe?

@AgentJayZ 6 лет назад

Cooling air for the back of the turbine disk in this engine leaks out into the gas stream where the outside edge of the rear cone forms a small gap to the base of the blades mount to the disks.

@mytmousemalibu 13 лет назад

@AgentJayZ lol, I had kinda wondered if the blades simply sheared them off! Otherwise there would be evidence of removal, just shear it, tap out remaining piece! Pretty ingenious system they thought up back then! Neat stuff! If i remember correctly, there was 1 afterburning Sabre, the very last one, The "Dog" the F-86D. I dont see it as an F-86 myself, looks way differant, not much in common with the other variants. Much uglier too! Forgot we have a Westinghouse J30 at school too...

@EsotericInnovator 10 лет назад

That's pure art..

@IgnitionAeroTech 8 лет назад

Hey +AgentJayZ love the videos, they've been very helpful with my personal project! Quick question: How much clearance is there between the tailcone inner portion and the rotating disc? Is there anything that contacts the disc to seal the area where the cooling air travels or is the cooling air higher pressure so no inward leakage occurs?

@AgentJayZ 8 лет назад

+Ignition Aero Tech On the older engines I work on, which are from fighter jets of the 1950s, there's about 1/4 to 1/8 inch between the back of the turbine disc and the tail cone front face. That gap between these two is often supplied with compressor bleed air to help in cooling the turbine disc.

@turbodyne.lighting 13 лет назад

@AgentJayZ all this is true, and you have helped me greatly in understanding that, but I was speaking more of a jet powered go cart, or something ive always wanted, a small jet powered glider, with a system that restarts the engine while air born so one could get to altitude under its own power, shut the engine off, glide back down, then get back up to altitude again. Or in my own crazy case, just having an engine to run and work on for the hell of it : )

@fromanabe8639 5 лет назад

Are those eight or ten smaller cylinders the combustion chambers?

@AgentJayZ 13 лет назад

@mytmousemalibu Yes, I'm not as up on my old time fighters as I should be, but i know some J47s were fitted with afterburners. The roll pins are hi temp, and bit softer than regular ones. At least they shear off easily when the blade roots are tapped forward to remove the baldes.... Uhhhhh never mind that! I never said that.

@scrfce123 13 лет назад

@Fierobsessed I was going to ask the same. My best guess is that since it is a blind hole, a self tapping bolt and a slide hammer is used. Would be a good subject for another vid.

@automechanicabrarkuwait 5 лет назад

I like this work

@thebentley71 4 года назад

Have you ever worked on a j58 out of the sr71? I'm an A&P mechanic as well, but I never used my license much just a little sheet metal work. I went to an Aviation school in San Antonio. The name of the school was Hallmark Aviation school of Aeronautics, but it is now called Hallmark Aviation College. I would love to work on turbines like yourself. As a young teenager I was fascinated with jet aircraft.

@bchokola 11 лет назад

That would be a really fantastic career! And yes, I'm heavily biased haha. We were brainwashed to hate "straight jets" (turbofan/jet) In the USAF, there were two engine mechanics: turboshaft/prop and straight jets. It kinda biased us a bit, but we got to work on some really cool aircraft! (The slow aircraft tend to have the most guns). But I'd much rather have the deep knowledge of different types of turbine engines. Impulse, reaction, impulse/reaction, dual spool, Variable IGV's, etc etc

@russkysalamander5983 10 лет назад

fantastic!, facinating

@colindhowell 12 лет назад

@mytmousemalibu You're right that the F-86D Sabre "Dog" was an afterburning Sabre, but it was far from the last Sabre. Rather, it was an offshoot of the main Sabre line that was specialized as an all-weather air-defense interceptor, a bomber killer. It had an afterburner for faster climb. The ordinary Sabre was a general-purpose fighter not suited as an interceptor.

@343jonny 12 лет назад

Question: It looked to me like the airfoils on the tail cone are adjustable since they have those little circles under them. I watched your videos on the engines with adjustable vanes. Do the tail cone vanes use the same piston-linkage system if they are adjustable?

@zarbitzmitsuwan2414 10 лет назад

Thank you very much oh you are very nice man. I like a person like you ,you are very kind to share these for the people. i wish God bless you. Hey AgentJayZ please let me see how to take out the locking Blades. Very thanks again and that will make every one be happy and you too. May God bless you.

@nguyentuan1990 11 лет назад

how did you take the pin out originally?

@nor4277 4 года назад

Is the ceramic coating a update,I work,on J 79 net engines Its been 50 years But I don't remember the ceramic coating on the hot section turbine blades ,but it's been a long time ?

@AgentJayZ 4 года назад

We apply modern technologies to old engines, and they become immortal.

@lesbrown7009 8 лет назад

What are you using for grease on the pins? Nickel-Moly?

@ramtek2702 4 года назад

It's NOT grease. It's anti seize compound.

@geralddobrynski7231 7 лет назад

Is that SSR on the shelf for sale?

@turbodyne.lighting 13 лет назад

I was hoping you would say what the compressor rotor in the background was, I have a C-130 squadron right across the street from my shop. I wonder how much thrust a T-56 engine without the extra turbine stages would produce? I like the size of the T-56 not to big, but not to small. Perfect size to do some experimenting with :)

@superdau 12 лет назад

How do you get out the sheared part of the pin that's still stuck in the blade? Is there a small hole in the blade to drive them out from the other side or is there some kind of "extractor" for them?

@AgentJayZ 13 лет назад

@mykhaledi F86-F sabre, flown in California Airshows.

@randyz1592 11 лет назад

So it looks like the roll pins fit into blind holes. How do you get the old pins out?

@srgofcb 12 лет назад

JayZ, shoulden't the slots in the pins all be oriented the same (facing enine inlet)? I can imagine 96 tiny slits could add up to close to an ounce of weight?

@AJKandK 11 лет назад

JayZ you do a pretty awesome job with your video's. Like many Canucks I've known and follow on youtube, you are entertaining and have a gift of teaching. I have one little complaint, What video is it because I haven't found it. Don't beat me for asking, Please! Go easy, I'm a new follower.

@haljohnson6947 8 лет назад

how do you remove those pins to replace a blade?

@AgentJayZ 8 лет назад

I've shown the procedure in a video. Please use the index for the playlist "Your Questions Answered"

@jamesmcpherson3924 6 лет назад

Could you plan to start balancing that first section of rotor blades by matching lighter pins with heavier blades?

@AgentJayZ 6 лет назад

No. The weighing and sorting only gets you to the starting point. The balancing runs are where the balancing takes place... Also, all the pins are of identical weight, within the resolution of our scale.

@sanjivvkhanna1498 3 года назад

Hi!! Agt J very nicely explained. I suggest you to start tutorial classes ,step to step ,every minute details inside of latest fighter and pax jet engines. Either you be live or video post. You see at currently all your previous videos are not in order.

@AgentJayZ 3 года назад

Just uploaded the 54th video chronicling the overhaul of a turbojet engine on Patreon.

@Ihavetruth22 10 лет назад

Your videos are sharp and closeups are clear. What camcorder do you use?

@AgentJayZ 12 лет назад

@Dhillipboy Turbines, wherever they are, have only one function. and what do you mean "the" turbine ? Typical bypass turbofans have two, and sometimes three turbines. They all do the same thing. They convert the energy contained in a stream of moving fluid into mechanical torque.

@bchokola 11 лет назад

The T-56-A-7 engines put out even less horsepower, since the TIT was reduced from 1050 to 960 *C (If I remember correctly; I used the tech data that dealt with -7 engines, but never dealt with them in reality. They used solid turbine blades vs. the -15 hollow, cooled turbine blades that could handle the higher temps). I believe that would put the horsepower somewhere around 3500+. Again, all of this is on a nice, cold day. A warm day would make you hit TIT before max torque and limit your power

@Ignignokt5150 8 лет назад

Curious as to the turbine blade removal , how are the roll pins removed to facilitate blade removal from the disc , and do they have a corresponding hole in the base ? I love this stuff , worked on yacht diesels and generators for 30 years but missed my calling .. The only thing that I wouldn't like is dealing with all of those HP lines :p ....

@AgentJayZ 8 лет назад

+Ignignokt Mooninite You need to look at the index for a playlist called Your Questions Answered. Hidden therein is the video where I demonstrate the process of removal.

@Ignignokt5150 8 лет назад

Thanks , wilco . Great videos !

@kilian7919 8 лет назад

+Ignignokt Mooninite any success in finding the video you were looking for? there's so many Qs...

@Ignignokt5150 8 лет назад

+Kilian Seelbach Yes . Q48 23:29 , of the Questions answered playlist . I had thought they were extracted whole , but being that they're softer metal than the actual blades , they're designed to shear . These videos are just great , especially if you have mechanical aptitude .

@AgentJayZ 8 лет назад

+Ignignokt Mooninite Oh.. you're giving away the secret! However, the mystery shall endure, because nobody reads previous comments before asking about the pins. Extra points to you for using the correct spelling for shear... most folks type in sheer.

@marlibread 5 лет назад

that turbine wheel looks spiffy.....hahaha...awesome!!!!!

@mytmousemalibu 13 лет назад

I thought the pins would be somthing special, not just a simple roll pin! I'd be a bit nervous putting the tail cone on there with an overhung turbine! Also intresting a big castle nut holds it on! Now the F-86 wasn't afterburning if I remember right? Cool stuff Jay! I may be one of you soon! There's a chance ill be at GE here soon. If allowed ill film some at school, we have a JT8D, some APU turbines, looks like what's in your huffer cart!

@sangarp2001 4 года назад

how heavy is one piece of the ceramic turbine and will break if knocked?

@AgentJayZ 4 года назад

How much wood could a woodchuck chuck...

@blobusus 13 лет назад

@gushhnet Is that what that was? It gave me a little chill, like it was a ghost or something.

@AgentJayZ 11 лет назад

I have answered this question so many times, I'm afraid I am unable to continue. Perhaps you may want to read below...

@laohantun7404 6 лет назад

thank you mate.....

@TerryPullen 9 лет назад

These videos are great. Sound, lighting, content, all first rate. Thanks! A couple of questions, first do you make any of your own tools? And, you deal with a lot of little parts, how do you know for sure that all the pins are in, that you didn't somehow loose a pin and skip a hole?

@AgentJayZ 9 лет назад

Yes, if needed. You need to be organized, and check, check , and check again.

@TerryPullen 9 лет назад

I thought so, you can't afford to make even a small mistake.

@AgentJayZ 11 лет назад

Correct me regarding what? This video is about a different engine that the one you mention.

@mariusfrost640 Год назад

It's interesting that the pins don't modify the balance. Or does balancing happen after this point?

@AgentJayZ Год назад

I've wondered about that too. I weighed a few dozen pins individually. They are all the same weight, within 0.1 gm. Actually they all register exactly the same on our scale with a resolution of 0.1 gm is a better way to say it. The pins are added after the final balance, but during test runs, the engines are far under maximum vibe limits.

@blameyourself4489 6 лет назад

AgentJayZ. How do you get the pins out again?

@AgentJayZ 6 лет назад

That question has been answered in several of my videos. ... Think of it as an Easter egg hunt...

@AgentJayZ 12 лет назад

Whether the slots face front or back, they still are arranged from inner diameter to outer diameter, so balance-wise it makes no difference. Axial position is of such a small consequence that it is disregarded.

@charleschristensen3085 7 лет назад

AgentJayZ

@wadehicks9270 6 лет назад

It looked as though there was a crack in the side wall of that part just behind the turbine. As you were panning the camera showing where the pipe go's together rite after the pipe ends it looks like there's one on that side wall. But maybe it just looked that way lol

@AgentJayZ 6 лет назад

You shoulda put the lol first. Then we could all just stop there.

@wadehicks9270 6 лет назад

AgentJayZ it's looks like there's a crack is that better ?

@AgentJayZ 6 лет назад

No. Watch the video... ... ... in two seconds the "crack" disappears. Because it is a dribble mark being highlighted by the lights. Do you really believe, that several experienced jet engine mechanics would not notice a huge, 6 inch crack in a case of an engine, sitting in the shop for weeks? Do you think that you can see, for one second of a video... something that the person who shot the video... couldn't? You must have "the best eyes ever"...

@jimmysparks315 4 года назад

How do you get the locking pins back out ?

@AgentJayZ 4 года назад

RTFIS

@stevereid7140 3 года назад

How do you get the pins out to remove the blades???

@AgentJayZ 3 года назад

The answer is literally right in front of you. Literally, and I mean that literally.

@AgentJayZ 13 лет назад

@TalksWithDirt .. I'm just a machine geek who is allowed to film the toys. Most turbine overhaul companies won't let employees take pictures of the work they do. I'm lucky, so feel it's my obligation to share with the curious.

@A0P1C0 6 лет назад

Hello Jay, How do you get the pins out?

@A0P1C0 6 лет назад

Dooh, I should have read the comments first. Lol

@bpark10001 5 лет назад

How do you get the pins out when servicing? Aren't they in blind holes?

@AgentJayZ 5 лет назад

Info section...

@docbipe 13 лет назад

@AgentJayZ When do I begin my training Master Yoda?

@braiansingh9730 5 лет назад

Just a little question, how do you do take that pins?

@AgentJayZ 5 лет назад

A very frequent question. It's answered quite a few times, and the procedure is shown in my most recent video of a J47. I have another one in the shop now, and removed a couple of blades just today. I'll take some more video of the blades being removed.

@bearbait2221 4 года назад

How do you get the roll pins out?

@AgentJayZ 4 года назад

Info section is a good source of info...

@AgentJayZ 13 лет назад

@JetAce08 A go kart or a display engine? Well, a 501, which is a T56 without the gearbox or prop, weighs 1200 lbs, and at 3 to 5 thousand Hp,burns many hundreds of gallons of fuel per hour. You need to look at one of those start carts. They come up for sale often on Ebay. Keep in mind they are about 75 to 100 Hp. They`d make good engines for a kart project. An insane kart project...

@Fierobsessed 13 лет назад

Silly but obvious question. How in the world do you get the roll pins back out?

@SG-oi9ie 7 лет назад

You must have a serious amount of patience to install that many pins.

@turbodyne.lighting 13 лет назад

@AgentJayZ lol, well ok a drag cart then. But I was speaking more of using the thrust to push it, not shaft Hp though. Plus I think i have more fun building my own stuff then getting a actual jet engine. I learn more from building it, not to mention its hard enough building the little projects I do since I have no real area to build in. Im technically not suppost to have any of this crap in my barracks room, or work on it at the cryo shop, so im kinda stuck with hoping a shop mate will let

@gushhnet 13 лет назад

@Fierobsessed I would imagine you tap them similarly to how you remove headless / broken bolts from an engine head, etc. There are reverse bits you can use, but we're talking lawn mower vs jet engine here, potentially having quite a few differences in finesse and tools required :)

@fw1421 5 лет назад

Those look like any roll pin,what’s the difference other than FAA/PMA?

@AgentJayZ 5 лет назад

They have a part number in the J47 Illustrated Parts Catalog, so we purchased them. I don't know if they are special in any way, but we use OEM parts whenever we can.

@AgentJayZ 11 лет назад

Oh, well I will not argue with anything you say, because you have much more experience with that engine than me. I was just rying to point out how much better the T56 was at making power than the older engines. When you say gearbox, that is a different thing on a turboprop: The J47 gearbox uses one percent or so of engine power to drive accessories. The T56 gearbox drives the prop with about 99% of engine power, so it would likely have the losses you mention.