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Old Oct 12, 2012, 12:25 PM
DPATE is offline
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Grad student in aeronautics
United States, GA, Atlanta
Joined Oct 2010
526 Posts
Quote:
Originally Posted by TangoKilo View Post
Tell me what is pushing your plane along at "a speed" (against the resistance of aerodynamic drag) if there is no thrust.

Not only that, if your propulsor is not producing any thrust it is not doing any work so it won't need any power input. Why do you need "wide open throttle" to achieve maximum speed? Where is the power going?
If the propeller is providing zero available thrust, then the work from thrust available is W = T_A * V_infinity = 0. However, the work from the motor is the product of the angular velocity of the shaft and the torque. In steady state, the torque on the shaft from the motor is equal and opposite to the torque on the shaft from the propeller, which will be nonzero.
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