That window killed their thrust. The idea is to create low pressure in front of the craft and high pressure behind. The craft attempts to stabilize eh pressure, by pulling the craft forward. The intake has to be unobstructed, or to have a duct that brings the intake axis, in line with the direction you want to go. They could have made a split duct with intakes on both sides of the cab. Something like this: intake___ \ ____engine intake___ /
one of my fav gags on TG is when they're traveling at walking speed in a boat and May throws a rope in the water, counts the knots and then says "we're doing 113 knots so about 130 MPH."
I just LOVE the shot of the jet engine maxed out and the wait for frame of camera. Then it slowly comes into frame lol I could have worded that better lol👍🐄🐮
You can't expect a turbine engine to have any significant thrust when you place it 10cm away from a plexiglass board, almost completely restricting the airflow.. have the boat whatever shape you like..
Jet engines: Big, scary, noisy, dangerous, probably only useful on airplanes. I like how all three know it's probably not going to work but all wonder "but what if it does work?"
I think that's one of the great things about it. If it works, it'll be brilliant and we'll be happy, if it doesn't, they'll have a laugh and we'll still be happy. It's a win-win.
Turbine engines exist that are small, not as loud, are not dangerous. Scary is subjective. The OH-6 I flew 51 years ago had a 250SHP turbine you could pick up and carry. The scary part came from the low level flying and the odd bullet or RPG. Years before that Chrysler built a series of turbine powered cars and firetrucks. I saw the firetruck in action and it seemed to be about as loud as a diesel powered truck. I never had the chance to see the turbine powered railroad engines. But I would guess that hey were big and noisy. Oh and yeah turbines really aren't the best choice for a car. : )
@@fred1barb The only time turbines become a choice for a car is as an electric range extender and in a small form factor. They run at their peak efficiency all the time and turn a generator that keeps charging the battery as you drive, so that combined with regenerative braking you'll never have to pull in to a charger. They weigh around 90 kilograms with a 10k hour maintenance interval (this is the Hybrid Kinetic H600 turbine) and output around 60kW of power at 40% thermal efficiency, a number subject to rise as we learn how to optimize the design for maximal peak efficiency instead of weight or power output.
I read everything you said in a normal voice in my head, but then with out thinking about it read "But what if it does work" in Jeremy's voice, and pictured him turning towards the camera as he said it.
No, it means he's playing it safe because he was left hospitalised for months with his life hanging by a thread after an accident in a jet powered car during the Top Gear years.
@@andrewmitchell2313 If they wanted insurance they could definitely afford/get it (remember this is Amazon not the BBC).... he was 100% playing safe... Imagine having a crash at 300mph plus, having a brain injury enduring a hospital stay for several months and then going and doing it again... you would be considered a moron if you did... Would you yourself want to do that yourself?
probably because the last time he got into a jet powered car it went off track, flipped violently and left him in the hospital pretty f*cked up lol don't blame him
When I'm flying a turbo prop I love taking off parallel runways with jets. Jets accelerate so slowly since the jet engine is chocking below about 200 mph.
I suspect that the reason for the slow speed is that the jet engine is pushing thrust downwards, which pivots the nose of the boat downwards. So the nose of the boat is being pressed into the water, creating lots of drag. Aim the jet engine upwards a bit, and that will lift the nose of the boat, and will probably result in good speed. Cheers!
That's true but the front surface of the car is always going to be subject from lots of resistance by the water, ideally trying to pivot the vehicle to some small degree. Of course what you say would certainly improve the outcome, but this situation is hard to remove entirely. Having a longer vehicle would also help, too, as well as mounting the engine as low as possible to lower both the center of gravity and the moment of the force
While you’re listing all the problems James, don’t forget to point out the nozzle is pointed down forcing the nose of the car into the water, thus creating more drag. Change the nozzle position, or make it adjustable.
@@jackbinmat7088 what do you mean. The engine requires about 2200 lbs of air per second at full throttle. Wouldn’t putting a flat piece of lexan in front of it about 2 feet away help air flow???🤔
Nether the slightly restricted intake nor the angle of thrust make any difference to the end performance of the vehicle in this example. Learn things before talking about shit you don't know.
For everyone wondering why the car didn't move that fast: it's a jet engine that requires a lot air to flow through it (sucks in air from the front, and blasts it out from the back). The placement behind the glass was not a good idea as everything in front of it would be sucked in it, including James and Jeremy. They didn't operate it anywhere near full power, it consumes over 300 gallons a minute at full power and would suck everything in it.
That and they hydrodynamics were shite with those pontoons and using air to push against air to propel through a substance that's 80 times as dense as air just doesn't work.
One of the major problems is the "cockpit" was directly in front of the jet. It cant pull in enough air with that obstruction in the way. The pontoons were also creating too much drag esp after being driven into the water. Also, water is much denser than air.
Jeremy: Why doesn't it work? James: Well its mainly to do with... (Some say James went on pontificating all through the cold night. Others say he's still there.)
That thing can only go 3 mph on the surface of a lake you call that an amphibious car 😂 it works though of all their faliures this thing actually works
That end where James mention everything that went wrong and the video just fade out is hilarious. Im dead :v Please make this again will yaa? I love it very much.
Hammond: "how much did it go?" Clarkeson: "3" Hammond: "that's your top speed? 3. You could row at 3mph" Clarkson: 😐😐 Me: "my grandma walks faster than that" 😂😂😂😂😂
Suggestion: Dump the pontoons, remove the perspex to give the engine a clear inflow for the air and run it on dry land. Alternative suggestions: Park it at Diddly Squat farm and use it for toasting marshmallows. As above but used as a bird scarer, for clearing snow, stubble burning...
I could be wrong, but I dont think that type of engine would work on water unless the output was below water, You don't see ships with huge engines shooting out the back into the air, its output is under water because it has to be transferred that way for maximum speed.
From someone who has operated a lot of jet engined vehicles, the middle point isn't necessarily the braking point. Accelerate-go/accelerate-stop distances are important in airplanes ;)
I love how they expected the engine to be powerful enough to push a high drag boat through water with the intake completely obstructed. The high speed airflow through the intake that happens in flight is really important for proper combustion and full power.
Ever since the days of Top Gear I've marvelled at all the amazing adaptions & stunts they've created over the years, driving sportscars through Romania, the Toyboater and caravan pisstakes being some of the favourites, the scariest was probably the homophobic reaction in the US southern town to Richard's 'Man Love' car. This water car film has to be up there with the rest, the hilarious speedometer and Jeremy's '70 is a 100' dial and the 3mph speed achieved. Yet none of that matters because what's important are the ludicrous and imaginary stunts and doing them plus the hilarious commentary from all 3 and the fade out of Captain Slow reeling off the reasons for this particularly epic failure. Since last December I've become a part time carer, looking after my newly widowed 85 year old mum who has colonic cancer (Europe's most common cancer) and has lost interest in doing anything and doesn't want to wake up in the morning. Last week she got her 3 offspring to sign the DNR form. She's given up and just wants to be with our Dad. At the days end we sit and watch her TV and one evening, on a hunch, I put on the 1st episode of Clarkson's Farm which she loved and was keen to watch more, even mastering the TV remote (something she had no previous interest in doing) and is looking forward to season 2. I'd like to thank the Producers, editors, the Trio and camera crews for all the memories and moments they've created to make us all laugh. Because laughter is the best ever medicine and it's free. The 3 of them should get an OBE or an MBE for what they've done, Captain Slow for cookery, the hamster for engineering and Jeremy for helping people to understand farming and farmers and for the 'receiving one in the nads from a sheep' clip shown in the Clarkson's Farm titles.
I should do an American version of this show! My dream is to have a job like this! Just reviewing vehicle all day and doing trips sounds like best job ever to me!
Jet engines are not a very effective method of propulsion at ground level, but if you change the progade vector of the engine to point slight downwards it should lift the front end of your vehicle to reduce drag. A hydrofoil or ekranoplan uses that exact method to achieve lift from the water's surface.
Wouldn’t have made much difference. Water resistance is a lot stronger than air resistance obviously and if it was due to angle the back end would’ve lifted up
@@nice_sprite5285 it was pretty close to the engine but I’ve seen things like that stuck in front of the engine and it still works. Not the best thing for it but works.
oh my goodness! I'm so glad you both survived! that was absolutely spectacular! I don't want to be a bullwilnkle or anything; but maximum hull speed can never be exceeded unless the hull displacement is overcome by actually riding on top of your front wave and lifting the boat up out of the water and reducing hull displacement. your trying to lift a car and a boat up out of the water with the thrust of a jet engine. if you ever actually achieve reducing your hull displacement and riding on top of your front wave then you may break some kind of world record for the most incredible achievement since the moon landing. that was probably one of the coolest youtube videos I've ever seen. you guys were so funny. I'm so glad you didn't sink. you should sell tickets to that event.
thats a total fail :D my homemade mini electric boat with one motor goes way faster than this and is way quieter. None the less I came to watch my 3 favorite top gear hosts :D
Something's wrong with their jet engine. That thing should have been able to give a few tons of thrust which would literally fly their boat. It provides a vertical accent to a plane that is heavier than that boat. Hammond was right they could even row with that speed. Surely that engine should give more power than two elderly people, lol.
@@TheFPSPower it was all for show anyway just bullshit pretending.....no one would actually be that stupid to think it would have worked ..the car and pontoons would had so much drag in the water even a slow speed would have torn it apart
@@skezburah I'm wondering if they tow it with a rope? Or push it? You'll notice they edit/cut off quite often just before the front/rear is shown in some shots.
@@TechyBen yeh wouldn't surprise me ..its all just for a show and entertainment...those 2 dudes would have never have put themselves in a position where the helmet and neckbraces are necessary....but yeh its a tv show and its got a lot worse since then as in this show was nothing compared to the reality poison garbage we have now ...but yeh u can tell they brand whore hard and say certain makes are good for $$$.....
