- Right, as this is a new forum, will a plane take off if it is on a conveyor belt
I can’t believe I’ve never heard this argument before! Which way is the conveyor going. Is the aircraft powered or not?
Scenario 1. ac not powered but conveyor moving it quickly enough through the air to create lift then it will take off, then stall.
Scenario 2 ac moving under its own power at the same speed that the conveyor moves in the opposite direction. No air over wings, no lift, no take off.
I live next to 2 airfields and know lots of aerospace engineers so i obviously know what I’m on about. If you disagree with me you will feel my rock and power washer.Posted 9 years agomboySubscriber
zokes – Member
Either you’re a poor troll Devs, or…….
zokes, how did you work that one out, he’s the first person on this thread to speak any real sense (though in fairness, he could have worded what he said a bit better).
AIR SPEED over the planes wings is ALL THAT MATTERS, the wheels on a plane are totally unconnected to the planes ability to get airborne. Conveyor belt moving at 200mph in a normal atmospheric environment (ie. not a vacuum) will result in enough air speed over the wings of most planes to make them take off, though if the engines aren’t running, it will stall and hit the ground.
Regarding helicopter on a turntable. Well, even at 78rpm it’s not likely. I’d much rather be the pilot in the plane on the conveyor belt than the poor dizzy bastard in the helicopter! 😉Posted 9 years ago
devs… it’s a conveyor that matches the plane speed in the opposite direction, so your scenario 2. Unfortunately you are wrong in that you think it won’t take off though.. [:D]
It won’t. The ac is standing still with regards to the air. It has no airspeed. There is no air  going over the wings to provide any lift so it cannot take off.
 Except for maybe some prop wash but this alone is not enough to make a plane take off otherwise they would be capable of vertical take off from a standing start.Posted 9 years ago
There’re lots of explanations on the web as to why it will take off. There’s a video of a model airplane on a conveyor belt, which takes off. Mythbusters made what was in essence a giant conveyor belt from which a plane took off.
Why do people insist on arguing that it won’t take off?Posted 9 years ago
Having read up on this now. If the wheels were frictionless i.e. the ac stood still if the conveyer moved backwards then the ac could take off put that is not how the question is worded. Forward speed does not equal conveyor speed in that case. To all the nay sayers take a kite down the park and run with it till it takes off. Then go down the gym and run on a running machine with the kite. When it takes off come back here and post the results.Posted 9 years agoGrahamSSubscriber
The wheels don’t really need to be frictionless – that’s just to avoid people saying “Ah.. but if the conveyor belt was going backwards at an infinite speed then the friction alone would be enough to hold back the plane”
In reality, with an actual plane and an actual conveyor belt as long as a runway it would easily take off.
go down the gym and run on a running machine with the kite
“go down the gym and run on a running machine with a kite that has jet engines attached to it”
Fixed that for you. 🙂Posted 9 years ago
If the forward speed equaled the conveyor speed, then if the aeroplane is stationary, then so is the conveyor. For the conveyor to have any speed at all, then the aircraft must have forward speed…
If the aircraft has forward speed, then it must be moving through the air…
Now follow that through.
As for the attempted kite analogy, well, unfortunately it’s incorrect.
D- (must try harder) 😉Posted 9 years agoclubberMember
Yes, so long as:
– the plane is capable of taking off on a normal run way
– the converyor belt isn’t going so fast that the friction in the landing gear wheel bearings prevents the plane reaching its min speed for take off.
(- the plane doesn’t hit the treadmill uprights as per 5th elefant 😉 )Posted 9 years ago
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