The Great Debate
This has inspired quite a bit of debate on our local board, so I thought I'd copy it over.
Originally Posted by Abneriel
I've been on MW where a question was posted (months ago) that has been brought back up...here's the question:
Imagine a plane is sat on the beginning of a massive conveyor belt/travelator type arrangement, as wide and as long as a runway, and intends to take off. The conveyor belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation. There is no wind. Can the plane take off? you guys are forgetting the key to the equation...the WHEEL speed and the BELT speed always exactly match. in a real situation, the plane would move forward, but the wheel speed would have to be going whatever the plane speed is + the belt speed. This is not the question the original poster presented. A= plane speed B= wheel speed (rotation) C= belt speed if A = 300 mph and C = 300 mph (in the opposite direction) then B must= 600 mph (rotation) 600 mph does not = 300 mph in order to get B to equal C, A must be at a stop. in other words if A = 0 mph and C = 300 mph, then B must also = 300 mph here we see that B and C are equal, which is what the original poster placed as the constant in the equation. to get B to = C, A must be at 0, which in this case A = the plane, which = no flight what do you guys think? anything I'm overlooking? I'm with the Pilots on this one, I believe the plane will take off every time. |
Somebody put a wind up plane ( the one with the rubber band) on a treadmill going full speed and the plane flew off the end of the treadmill like it was nothing.
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In aeronautics(sp?) what causes a plane to fly is lift (aka wind/airspeed underneath the wings). So if there is no airspeed the plane will not take off.
-Mark |
Originally Posted by 04 Terminator
Somebody put a wind up plane ( the one with the rubber band) on a treadmill going full speed and the plane flew off the end of the treadmill like it was nothing.
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All you'll end up with is the wheels spinning faster as it takes off normally.
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if this goes on for more than 2 pages, i feel sorry for all who think the plane wont take off.
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Originally Posted by Wnt2Go10o
if this goes on for more than 2 pages, i feel sorry for all who think the plane wont take off.
No airspeed = no lift = a grounded aircraft It isn't rocket science. -Mark |
Originally Posted by Bitemark46
Oh really? Then explain on how the plane will generate airspeed when the plane itself is not moving only the wheels.
No airspeed = no lift = a grounded aircraft It isn't rocket science. -Mark |
Originally Posted by Wnt2Go10o
because the riddle starts with the conveyor belt matching the speed of the wheels in the opposite direction. wheels are not powered there for the only result would be a false ground speed reading. air speed wouldnt change and the plane would take off.
Thrust from a jet or pull from the prop is what moves a plane. It is irrelivant what the speed of the tires are so long as the plane is moving forward. In this scenerio which "is" different than the original post (but doesn't change the result) the plane will take off. Even if the conveyor moved in reverse as fast as the plane goes (which would keep the wheels stationary) the plane would lift do to drag on the top of the wings. Wheel speed has nothing to do with a plane taking off other that allowing the plane to move freely as the thrust or prop moves the plane. A plane is capable of taking off from water where the plane doesn't even use wheels anyway. |
Make the scenerio a tail wind factor that matches the speed of the plane and then you have a grounded plane.
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