View Poll Results: what do you think?
Hoss is da man, no
25
33.78%
Geico's question. He knows, yes
42
56.76%
your both wrong its a vto
7
9.46%
Voters: 74. You may not vote on this poll
will the plane fly?
12-07-2005, 05:11 PM
#541
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Originally Posted by RustyJC
Justin,
The wheel is imparting no forces on the plane other than a vertical force to overcome gravity. It has 100% traction against the conveyor belt but (1.) is not being braked and (2.) has frictionless bearings. Therefore, it cannot retard the acceleration of the plane. That being the case, the thrust force vector (forward) is only working against the mass (inertia) and aerodynamic drag vectors (aft) - nothing different than a normal takeoff. The plane will accelerate and lift off, even if the conveyor speed has matched the plane's velocity and the wheels are stationary. If the conveyor is moving opposite the plane and matching the plane's velocity (minus sign relative to the plane), then the wheels will be rotating at twice their normal speed, but the plane will still take off.
The key is that the velocity of the plane relative to the conveyor is meaningless. All that matters is the plane's velocity relative to the atmosphere.
Rusty
The wheel is imparting no forces on the plane other than a vertical force to overcome gravity. It has 100% traction against the conveyor belt but (1.) is not being braked and (2.) has frictionless bearings. Therefore, it cannot retard the acceleration of the plane. That being the case, the thrust force vector (forward) is only working against the mass (inertia) and aerodynamic drag vectors (aft) - nothing different than a normal takeoff. The plane will accelerate and lift off, even if the conveyor speed has matched the plane's velocity and the wheels are stationary. If the conveyor is moving opposite the plane and matching the plane's velocity (minus sign relative to the plane), then the wheels will be rotating at twice their normal speed, but the plane will still take off.
The key is that the velocity of the plane relative to the conveyor is meaningless. All that matters is the plane's velocity relative to the atmosphere.
Rusty
12-07-2005, 05:19 PM
#542
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Originally Posted by HOHN
Since the velocities are identical (change in position), and occur over the same time (in opposite directions), then the POSITION MUST BE THE SAME.
12-07-2005, 05:37 PM
#543
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Originally Posted by Geico266
There is your mistake. Position is not the same only the speed of the wheels.
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