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Old Oct 15, 2012, 11:50 AM
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Dr Drela gave you a figure for thrust. He never told you the speed the plane is moving at. He told you that if the plane were to move at the same speed as the efflux there would be no thrust from the motor. How the plane got to that speed is irrelevant, we can assume it didn't get there because of the motor's thrust, because the maximum speed the plane can reach is when the thrust matches its drag. And that's well before the plane matches the efflux speed.
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