Plane on conveyer: Will it ever take off?
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From: limerick
Tedow! Please explain this to me. I'm hopelessly confused, I'm assuming that I'm not getting something.
I'm reading that the plane is producing thrust but relative to the ground and the aire isn't moving foward so no air is actually moving over the wings. Where's the lift?
I'm reading that the plane is producing thrust but relative to the ground and the aire isn't moving foward so no air is actually moving over the wings. Where's the lift?
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From: limerick
Originally Posted by Tedow,Dec 2 2005, 07:33 PM
Let me try coming at it from a different direction.
A plane is coming in to land at 200 mph. It's going to land on a conveyor belt that is moving in the opposite direction at 200 mph. What happens when the plane lands? Does it stop immediately simply because the conveyor belt is there? Absolutely not. The plane lands and rolls down the runway exactly as normal, except the wheels will spin twice as fast.
Does that illustrate the point any better? About the only other thing I can think of to explain more clearly than I have is to break out a scanner, a free-body diagram, and some equations
.
A plane is coming in to land at 200 mph. It's going to land on a conveyor belt that is moving in the opposite direction at 200 mph. What happens when the plane lands? Does it stop immediately simply because the conveyor belt is there? Absolutely not. The plane lands and rolls down the runway exactly as normal, except the wheels will spin twice as fast.
Does that illustrate the point any better? About the only other thing I can think of to explain more clearly than I have is to break out a scanner, a free-body diagram, and some equations
.
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From: limerick
I would expect that if there was any air moving over the wings that would create a slight lift that if it could bump up it would accelerate extremly fast but how does it get the initial lift if relative to to the air there isn't any air moving over the top of the wing how does it get the lift?
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From: limerick
Originally Posted by r_duff,Dec 2 2005, 09:29 PM
hot water freezes faster than cold water? 
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From: limerick
Originally Posted by Elistan,Dec 3 2005, 12:22 AM
Why do you think the plane isn't moving forward? The belt could be moving at five thousand miles per hour, but the plane will still easily move forward from the engine thrust. Remember, they just turn freely.
Joined: Jun 2003
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From: Johnstown, PA
I think for the people who didnt get it, they just read to deep into understanding peoples replies. Thus resulting with a bunch of confused people!
I caught it after the first person said about the engines thrust having nothing to do with the wheels on the plane. Being a sort of aircraft enthusiast, it was kinda funny to watch people get more and more confused as the thread went on!
I caught it after the first person said about the engines thrust having nothing to do with the wheels on the plane. Being a sort of aircraft enthusiast, it was kinda funny to watch people get more and more confused as the thread went on!