I wish someone would just go and test the myth That would solve all the hassles of people arguing about who is theoretically right and blah blah blah....
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the fun is bringing up little extra things outside the scope of the question!

like the effect the massive moving runway would have on the air above it, and therefor on the plane trying to take off. The runway should generate some headwind, making it easyier for the plane to take off.

So what would happen if the pilot hit the ejector seat button.
Would he go straight up or would he go up and backwards?
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As someone pointed out, the problem is the question is badly worded.

"Plane speed" and "the plane moves" are too vague, and there are too many unspecified variables.

It depends on whether you are referring to ground speed, relative to a ground-stationary observer, what the wind is doing.

The plane could be doing 100km/hr ground speed, but with a tail-wind high enough to reduce its *airspeed* below its stall point, it wont take off.

It could be doing 20km/hr into the wind and easily take off.

Assuming the wind to be nil, "plane movement" to refer to ground speed. the plane will take off exactly as normal, the only effect will be that the wheels will be doing twice the apparent ground velocity of the plane.

@George. Again. relative to the ground, he would follow a ballistic arc... relative to the plane (ignoring wind drag), he would go straight up.

think of the old analogy of playing ping pong on a train. Its all about frames of reference and velocity vectors.. stuff your average person isnt used to thinking in

Asking vague questions with trick wording sure is good to get everyone thinking..
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ok i my opinion (right or wrong) this way might make it take off (this may be what your getting at), picture your rear wheel driven car and a dino putting the rear wheels on the dino and letting it build up speed than hitting the breaks on the dino rollers and watching the car shoot forward at whatever speed they were testing it at the same could be said bout the plane.

let it build up to take off speed then hit breaks on conveyr belt launch the sucker that way .
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best quote ever:: "Those Gas-Turbine style warehouse heaters arent illegal, and neither is remote controlling one as far as I know."

yep crappy question wording
australian robot ppls are 100% correct
damn we are just so smart eh
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Mechanical engineers build weapons, civil engineers build targets

damn straight
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YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

No. Wrong.
The car on a dyno would all come down to momentum. An object at rest will tend to stay at rest while an object in motion will tend to stay in motion. So on and so forth.
What you are looking at here is momentum. Momentum = mass * velocity. A car at rest (relative to the ground) spinning its wheels on a dyno will posses only a small amount of momentum in the form of rotational momentum in the wheels (and transmision and bits in the engine). Rotational momentum = moment of inertia * angular velocity. If the brakes are suddenly applied to the dyno the total momentum of the wheels will only bring the speed of the combined mass of the car and wheels up to only a fraction of that at what the dyno was reading.
If you don't believe me read this: http://www.glenbrook.k12.il.us/gbssci/phys/Class/momentum/u4l1a.html
So with the aircraft on a conveyer (if you still beieve that an aircraft is driven through its wheels and not by propellers/jets) the mass of the wheels compared to the total mass of the aircraft is almost insignifcant and the aircraft would bearly move at all if the breakes where suddenly aplied even if you ignore the losses through friction.

Sorry for the spelling but I'am tired.
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if the brakes did grip and the tires also griped the conveyor then the plane would suddenly be launched back wards as the conveyor is susposed to be going in the opposite direction lol

quote:

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Will this plane take off?

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quote:

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if the brakes did grip and the tires also griped the conveyor then the plane would suddenly be launched back wards as the conveyor is susposed to be going in the opposite direction lol

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the plane would take off because i pushed it
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quote:

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Originally posted by Big AL:
anyone got an ultra light willing to test this out?

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Nice modified boat trailer you have there Brett
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Actually the trailer I built for it looked more like a boat.

Someone called it a "mobile hangar" once, but it was a PITA to tow with anything less than a land-cruiser..
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Great minds discuss ideas. Average minds discuss events. Small minds discuss people