Re: think about this...
 

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Alright, now what if it's a jet?

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The owl better stay in the cockpit.

Re: think about this...
 

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opposite direction of the plane

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Define "opposite" if the plane isn't moving.

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Oohh! I think you're on to something!

Re: think about this...
 

How bout some normal forces up in this!

Re: think about this...
 

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[ QUOTE ]
opposite direction of the plane

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Define "opposite" if the plane isn't moving.

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no.

Re: think about this...
 

[ QUOTE ]
Alright, now what if it's a jet?

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[img]/images/graemlins/frown.gif[/img]


i've got no more ideas right now. i poured my heart and soul into that diagram.

Re: think about this...
 

The proposed scenario is physically impossible. As soon as the plane starts to move forward relative to the ground by thrusting with it's props or jets, the wheels will move faster than the conveyor belt.

If the conveyor tries to speed up to compensate for this then the wheels, which are touching the conveyor belt, will also speed up, up to infinity, and maintain their relative speed compared to the conveyor. So, if the plane is moving forward 200 MPH relative to the ground, it's wheels will always move 200 MPH faster than the conveyor belt.

Bob

Re: think about this...
 

[ QUOTE ]
The proposed scenario is physically impossible. As soon as the plane starts to move forward relative to the ground by thrusting with it's props or jets, the wheels will move faster than the conveyor belt.

If the conveyor tries to speed up to compensate for this then the wheels, which are touching the conveyor belt, will also speed up, up to infinity, and maintain their relative speed compared to the conveyor. So, if the plane is moving forward 200 MPH relative to the ground, it's wheels will always move 200 MPH faster than the conveyor belt.

Bob

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This is at the same time both the most wrong and the most right (outside of Ray, blinden84, and myself) I've seen anybody be in this thread.

Re: think about this...
 

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ok, I think I'm still missing some stuff, but I tried to be as thorough as possible. I demand a lot of partial credit for showing formulas


http://img474.imageshack.us/img474/6564/plane4vg.jpg

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wow where is the 10 star option?

Re: think about this...
 

Is this really any different than asking if a plane can take off on a sheet of ice (or something frictionless)? If I'm standing on roller skates on a treadmill (which I do often) and somebody pushes me forward I'm still going to move forward, just as the plane will still move forward because the props are propelling it forward --- the wheels seem irrelevant.

Re: think about this...
 

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Is this really any different than asking if a plane can take off on a sheet of ice (or something frictionless)?

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Well, the wheels do help keep it from sliding sideways and from yawing.