Question: Will the plane fly? (warning: nerdy)
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I get that you guys are very passionate about this. Just dont assume that it is common knowledge to understand these things. It would bother me if you guys really thought that someone was inferior because they didnt understand how this would function.
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See, was it that hard to play nice.
I understand what your saying. I just didnt think that the plane could create enough force under the wing to take off at zero ground speed.
I have seen jets take off by hovering then rotating the engines to propell them forward. It just didnt look as if that was the same case as a passanger plane.
I understand what your saying. I just didnt think that the plane could create enough force under the wing to take off at zero ground speed.
I have seen jets take off by hovering then rotating the engines to propell them forward. It just didnt look as if that was the same case as a passanger plane.
above picture is of a plane that was not properly tied down in a storm. its ground speed was 0, but the wind over its wings created enough lift to break the tie downs and send the plane airborn. of course, uncontrolled, it crashed.
think of a bird, the most basic example of flight in nature. a bird can fly in a wind tunnel, or in a storm, with 0 ground speed. it generates its propulsion by pushing air, not the ground. planes and helicopters do the same thing.
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lol jesus this again?
There are 2 ways to view/read this questions
1) The plane provides just enough force for the wheels to match the treadmill speed in reverse at take off speed. IN this case, the plane will just stay stationary and wont take off. I DO NOT support this case with the WHEELS only spinning at take off speed. However, this is simply retarded and you might as well just tether the plane to a light pole and turn on the treadmill then ask if it will fly
2) The plane takes off as it normally should, and there is a treadmill instead of a full length runway that matches its AIRSPEED in reverse. Key term, air speed, as in the plane is still moving through the air. In this case the plane still takes off, the only thing that changes is the wheels are spinning 2x as fast as they normally would on a stationary runway. With a proper designed wheel, the firction in the bearings won't be enough to change anything assuming the engineer wasnt a dumb nut and has a SF of at least 3 or 4 built in
So as a ME, and the way I read the question, the plane WILL take off. All the naysayers can get bent if you ask me. And if you try to use a car or a person running on a treadmill as an example. Do not pass go, do not collect $200.
There are 2 ways to view/read this questions
1) The plane provides just enough force for the wheels to match the treadmill speed in reverse at take off speed. IN this case, the plane will just stay stationary and wont take off. I DO NOT support this case with the WHEELS only spinning at take off speed. However, this is simply retarded and you might as well just tether the plane to a light pole and turn on the treadmill then ask if it will fly
2) The plane takes off as it normally should, and there is a treadmill instead of a full length runway that matches its AIRSPEED in reverse. Key term, air speed, as in the plane is still moving through the air. In this case the plane still takes off, the only thing that changes is the wheels are spinning 2x as fast as they normally would on a stationary runway. With a proper designed wheel, the firction in the bearings won't be enough to change anything assuming the engineer wasnt a dumb nut and has a SF of at least 3 or 4 built in
So as a ME, and the way I read the question, the plane WILL take off. All the naysayers can get bent if you ask me. And if you try to use a car or a person running on a treadmill as an example. Do not pass go, do not collect $200.
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1) The plane provides just enough force for the wheels to match the treadmill speed in reverse at take off speed. IN this case, the plane will just stay stationary and wont take off. I DO NOT support this case with the WHEELS only spinning at take off speed. However, this is simply retarded and you might as well just tether the plane to a light pole and turn on the treadmill then ask if it will fly
Werd, a simple free body diagram will show that the plane will progress forward through the air since there is there no force to stop it, the treadmill is negligible for all intensive reasons. Show me a freely spinning bearing (that's not seized of course) that can some how impede thousands of pounds of force and Ill give you $100
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My mistakes were not reading the entire thread and assuming that a Jumbo Jet needed some ground speed to create enough lift to take off.
Not to say that only ground speed would allow it to take off, but that it needed the ground speed in combination with the thrust from the jets to take off.
Not to say that only ground speed would allow it to take off, but that it needed the ground speed in combination with the thrust from the jets to take off.
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this entire thread was rendered useless by the 1980's:
http://www.youtube.com/watch?v=RrpJmNRrVHI
http://www.youtube.com/watch?v=RrpJmNRrVHI
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for some reason this thread makes me think about Oakland people cars with spinners on them, and one of the spinners wont spin! LOL