SACAA ATPL(H) Principles Of Flight Practice Questions - SACAA Airline Transport Pilot Licence (Helicopter) Principles Of Flight Examination Exam

Ground effect (IGE hover) significantly reduces required engine power primarily because:

The proximity of the ground restricts downwash velocity, reducing induced flow and decreasing induced power required Ground cushion increases engine air intake compression, raising turbine shaft power output Tail rotor thrust becomes unnecessary when hovering within one main rotor diameter of the surface Rotor blade parasite drag drops to zero due to surface boundary layer interference

Correct Answer:

The proximity of the ground restricts downwash velocity, reducing induced flow and decreasing induced power required

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