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The momentum conservation equation for a helicopter in climb state is independent of which term?(a) Climb velocity(b) Induced velocity(c) Wake velocity(d) Mass fluxI got this question during an interview.This interesting question is from Momentum Theory in division Helicopter Dynamics of Aerodynamics

Answer»

Correct ANSWER is (a) Climb velocity

For explanation: The MOMENTUM equation for the helicopter in flight CONDITION is given by:

T=\(\dot {m}\)(V+w)-\(\dot {m}\)V

T=\(\dot {m}\)w

Where, V is the climb velocity

w is the induced velocity in the wake region

T is the thrust

\(\dot {m}\) is mass flux

On observing the equation, we see that the momentum equation is independent of the climb velocity.



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