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The actual induced power loss result is less than the momentum theory result.

(a) True

(b) False

I had been asked this question in an internship interview.

This intriguing question originated from Momentum Theory topic in section Helicopter Dynamics of Aerodynamics

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The correct option is (b) False

To explain: While formulizing momentum theory, the rotor blade is modeled as an actuator disk which is only an approximation. The flow field in an actuator is assumed to be steady whereas in real life it isn’t. Hence, the actual induced power loss is higher than the calculated value from the momentum theory due to the presence of unsteady vortices.

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