As a helicopter moves forward from a hover to a speed of about 15 kts., the power

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As a helicopter moves forward from a hover to a speed of about 15 kts., the power required is reduced because

a. the efficiency of the rotor is improved.

b. the helicopter is moving into a region of undisturbed air.

c. the tip vortices are left behind.

d. All of the above.

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Flight Theory And Aerodynamics

ISBN: 9781119772415

4th Edition

Authors: Joseph R. Badick; Brian A. Johnson

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