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Hi guys I am mostly a lurker here and haven't really posted but am having this debate on another and have read several other boards(car/aviation/engineering) with the same debate and it seems the is pretty even split on everyones opinion as to the answer to this question. I am just trying to get your take on it.
"A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction)."
Hi guys I am mostly a lurker here and haven't really posted but am having this debate on another and have read several other boards(car/aviation/engineering) with the same debate and it seems the is pretty even split on everyones opinion as to the answer to this question. I am just trying to get your take on it.
"A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction)."
I say no because the tires are basically just spinning on the tredmil, so no because there is no wind going over and under the wings. But that is my thoughts on it, but what do I know.
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I say no because the tires are basically just spinning on the tredmil, so no because there is no wind going over and under the wings. But that is my thoughts on it, but what do I know.
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I also say no.
By the plane moving forward and the conveyor moving backward at the same rate of speed, the plane will stay in the same place. Just like a person walking on a treadmill.
If the plane isn't moving forward, then there is no wind travelling past the wings. Just like when you run on a treadmill you don't feel any wind.
If there is no wind passing the wings, the wings can't do their job and create the lift necessary for the plane to take off.
I've seen this debate on other boards...and I'm quite frankly baffled by the people who believe that it will take off. Without any kind of lift being created by wind passing by the wings, a plane can't take off.
It seems that the people that claim that it would take off are all going on the assumption that even with the conveyor moving in the opposite direction, the thrust of the plane would eventually overtake that and the plane would in fact move forward. I, personally, feel that the question is worded so that the plane moving forward is an absolute impossibility. The question states that as the plane's speed increases, so does that of the conveyor belt. If the plan is travelling at 200mph, then the belt would be moving at a speed that is high enough to compensate for the plane's speed and thus the speed of the plane (relative to someone standing and watching) would be 0 mph.
What I do wonder about this whole thing though, if it is possible for the plane to take off from the conveyor belt moving in the opposite direction, wouldn't our crazy military have done some experimentation on it to see if they could make smaller aircraft carriers and smaller airfields that would still allow the same planes to take off...just in alot less space? It would seem like if an airplane could take off from a conveyor system like this, they'd be trying to use it to their advantage.
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Last edited by Gimpdiggity : 02-26-2007 at 05:45 PM.
I would say I was already having fun with this thread until I saw the size of Jasonn's signature... gah overkill
Quote:
I've seen this debate on other boards...and I'm quite frankly baffled by the people who believe that it will take off. Without any kind of lift being created by wind passing by the wings, a plane can't take off
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Man, oh man...
Yes it wil take off. Its forward motion is provided by the prop or jet, not by driving the wheels. The wheels will spin at (conveyor speed) + (aircraft speed).
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Quote:
Originally Posted by Jacob Smith
Man, oh man...
Yes it wil take off. Its forward motion is provided by the prop or jet, not by driving the wheels. The wheels will spin at (conveyor speed) + (aircraft speed).
Right. Nobody is arguing that. But by your logic, an airplane would take off from a stand still immediately.
If the wheels are spinning at 200 mph and the conveyor is spinning at 200 mph, the aircraft is still standing still on the conveyor belt. Thus there is no wind passing the wings. Thus there is no lift. Thus there is no takeoff.
A slightly similar example would be, if an airplane were to produce enough thrust to takeoff, yet it were being held still by some giant metal arms that hold it in place, if those arms were removed would the plane immediately takeoff??
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Last edited by Gimpdiggity : 02-26-2007 at 05:49 PM.
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Quote:
Originally Posted by WannaMoto
I would say I was already having fun with this thread until I saw the size of Jasonn's signature... gah overkill
+1 bajillion
I love scrolling past 39 quotes to get to the next post.
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Yes it wil take off. Its forward motion is provided by the prop or jet, not by driving the wheels. The wheels will spin at (conveyor speed) + (aircraft speed).
I think your missing it...
Airplane <----------
Tredmil ---------->
That equals a stationary position. No wind, no lift, no fly.
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Quote:
Originally Posted by kneedraggin650s
I think your missing it...
Airplane <----------
Tredmil ---------->
That equals a stationary position. No wind, no lift, no fly.
Right. That's what our side says.
The other side says that regardless of what the conveyor does, the engines on the airplane will actually produce enough thrust for the airplane to eventually move forward, and then eventually take off.
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Will this plane take off?
