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Forum » If a jetliner was on a conveyor belt...
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Thread: If a jetliner was on a conveyor belt...

post 1622743271 11-15-2020, 08:48 PM
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If a jetliner was on a conveyor belt...

I.e. a powered conveyor belt (like a treadmill) which always matched the jets rolling speed, in calm weather conditions, would it take off or no?
Explain your answer.
post 1622743391 11-15-2020, 08:50 PM
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Originally Posted By OneLegSquats⏩
which always matched the jets rolling speed
This means the plane is stationary on the treadmill?

Then it wouldn't take off. Planes achieve liftoff due to traveling forward causing a difference in air pressure on the wings.
post 1622743561 11-15-2020, 08:53 PM
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I think it will take off

The propellars are going full power so its still suckin in air and expelling it. Basically the pilot can sit on the treadmill and whenever hes ready pull back and make it fly
post 1622743681 11-15-2020, 08:54 PM
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Originally Posted By TheTwilightZone⏩
This means the plane is stationary on the treadmill?

Then it wouldn't take off. Planes achieve liftoff due to traveling forward causing a difference in air pressure on the wings.
All it means is whatever speed the wheels are rolling at, the conveyor belt will match that speed. E.g. the wheels roll at 200mph, the conveyor belt will move at 200mph, thus matching the speed of the wheels
post 1622743781 11-15-2020, 08:56 PM
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post 1622743821 11-15-2020, 08:56 PM
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Lol op.
post 1622744051 11-15-2020, 09:00 PM
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Come on OP everyone knows planes achieve liftoff due to traveling forward causing a difference in air pressure on the wings.
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post 1622744081 11-15-2020, 09:01 PM
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Originally Posted By lawlessly⏩
Come on OP everyone knows planes achieve liftoff due to traveling forward causing a difference in air pressure on the wings.
but surely the turbines would overpower the force of the belt
post 1622744191 11-15-2020, 09:02 PM
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Doesn't a jet get thrust from its jets and not the wheels even on the ground? Then the wheels don't mean anything, it would still move at whatever speed the jets are pushing it at and the wheels would just spin twice as fast
post 1622744281 11-15-2020, 09:04 PM
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Inb4 300 page thread.

The answer is NO. IT WILL NOT FLY. NO PRESSURE, NO LIFT.
post 1622744401 11-15-2020, 09:05 PM
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Originally Posted By padrote⏩
Doesn't a jet get thrust from its jets and not the wheels even on the ground? Then the wheels don't mean anything, it would still move at whatever speed the jets are pushing it at and the wheels would just spin twice as fast
But the conveyor is set to match the speed of the wheels, so wheels spin twice as fast = conveyor moves twice as fast
post 1622744501 11-15-2020, 09:06 PM
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Originally Posted By OneLegSquats⏩
But the conveyor is set to match the speed of the wheels, so wheels spin twice as fast = conveyor moves twice as fast
Negged.
post 1622744601 11-15-2020, 09:07 PM
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Originally Posted By luckyboy23⏩
Negged.
Negged.
post 1622744761 11-15-2020, 09:09 PM
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Mythbusters tested this. A plane would take off.
post 1622745061 11-15-2020, 09:13 PM
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Originally Posted By goingcia⏩
Mythbusters tested this. A plane would take off.
can confirm just watched
post 1622745271 11-15-2020, 09:16 PM
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post 1622745331 11-15-2020, 09:17 PM
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Originally Posted By goingcia⏩
Mythbusters tested this. A plane would take off.
can confirm Adam touched his sister
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post 1622745411 11-15-2020, 09:18 PM
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A treadmill isn't going to make a plane stationary. You might tear off the landing gear/blow up the tyres, but the plane is still going to move forward.
post 1622745861 11-15-2020, 09:23 PM
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the conveyer belt doesn't matter, the thrust from the engines will still cause the plane to move forward, doesn't matter the speed of the wheels.
post 1622745981 11-15-2020, 09:25 PM
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Originally Posted By OneLegSquats⏩
I.e. a powered conveyor belt (like a treadmill) which always matched the jets rolling speed, in calm weather conditions, would it take off or no?
Explain your answer.
Flat earth proves that the plane isn’t even actually moving in the air. So technically it’s flying on the conveyor belt.
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post 1622746151 11-15-2020, 09:27 PM
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Originally Posted By TheTwilightZone⏩
It could work if the giant conveyor belt is moving the plane forward.

There is absolutely no way a plane on a giant treadmill that is stationary would take off. Why would the wheels spinning cause the plane to take off? That makes zero sense.
Plane will accelerate and take off no matter how fast the belt moves. It uses air to move itseld.
post 1622746201 11-15-2020, 09:28 PM
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Originally Posted By Atrnmike⏩
the conveyer belt doesn't matter, the thrust from the engines will still cause the plane to move forward, doesn't matter the speed of the wheels.
The treadmill does matter because it's applying friction to the plane. The problem is planes aren't designed to go max speed on their landing gear - the friction would tear off the landing gear way before the wheel friction was enough to equal the force of the engines.
post 1622746741 11-15-2020, 09:36 PM
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It would take off. The wheels are free rolling and so there will be minimal force or friction in the backward direction regardless of how fast the belt moves in the opposite direction. The thrust of the engine is the primary moving force and the plane would eventually take off even if there was some small friction applied.
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