Calling all clever people :) What do you make of this?

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#561
anatech said:
The belt will move at increasing speed to oppose the rotation of the wheels.
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That is stipulated

The plane accelerates normally with respect to the ground, the wheels are stationary with respect to the belt. [/B]
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Chris, Please try and explain that one. I can't get my head around what the wheels and belt will be doing at the point of takeoff in your scenario. ie: the speed and rotation of each.

Here we go again! 😱 [/B]
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Indeed.
 
#563
Hi Cal and Al,
Didn't you have enough the first time around??🙄 😀 😀

Cal, in my version, the belt moves to oppose the rotation of the wheels. So when the wheels begin to rotate, the belt must move in the direction that the fuselage is moving to stop that motion. Therefore, the rotation of the wheels is replaced by the forward motion of the belt. Plane is happy and off it goes.

Sorry, just had to respond. :clown:

-Chris
 
#568
Hi Cal,
In answer ...
Cal, in my version, the belt moves to oppose the rotation of the wheels. So when the wheels begin to rotate, the belt must move in the direction that the fuselage is moving to stop that motion. Therefore, the rotation of the wheels is replaced by the forward motion of the belt. Plane is happy and off it goes.
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The question is in the point of reference. I am making the assumption that the situation is plausible in that nothing that defies physics is allowed to occur. Otherwise, it's a rather pointless question as a mind exercise. The question is pointless as it relates to our reality.

Tell you what, send me a ticket (round trip) and we'll discuss this over a beer, maybe a few. Then we'll celebrate! :cheers:

Al,
The wheels are not rotating and the belt is moving to ensure the wheels do not turn.

-Chris
 
#572
Hi Cal,
I posted too.

Please forgive me for this ....
Imagine a plane is sat on the beginning of a massive conveyor belt/travelator type arrangement, as wide and as long as a runway, and intends to take off. The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation.
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I had to.
A snippet, if you will ...
The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation.
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Okay, a smaller piece of the above ....
moving in the opposite direction of rotation.
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I interpret this to mean the belt opposes the rotation of the wheel. Is this okay?

-Chris
 
#577
bottom line. the jets push the plane, not the wheels. therefor the plane will take off and the conveyor belt will loose traction because the plane is lifting itself in movement. if will fly, will take a long-asss time because the conveyor is stealing all of the planes potential momentum....like as if the plane was loaded with way more weight then it should have. but once its in the air. it'll take off no problem. (assuming the wheels dont have terrible bearings, creating drag)
 
#578
well...in that theory the wheels could increase speed indefenantly and the rubber would explode when they wear down and rub up against the aluminum landing gear...so the plane would meet face to face with the conveyor at thousands of MPH and be thrown back into a giant fireball. :whazzat:
 
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