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

How does an increase in density altitude affect main rotor performance and power required to maintain a hover?

Rotor thrust decreases for a given pitch and RPM, requiring higher pitch angles and more engine power to hover Rotor thrust increases due to lower air resistance, reducing required hover power Air density has no effect on rotor lift production, affecting only tail rotor efficiency Rotor profile drag increases significantly while induced power drops to zero

Correct Answer:

Rotor thrust decreases for a given pitch and RPM, requiring higher pitch angles and more engine power to hover

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