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

What is induced flow (downwash) in a hovering helicopter, and how does it influence blade angle of attack?

Downward air velocity drawn through the rotor disc that reduces the effective angle of attack for a given mechanical pitch setting Upward flow created by ground reflection that increases the effective angle of attack Horizontal airflow caused by forward airspeed that shifts the lift vector aft Spanwise centrifugal airflow that delays boundary layer separation at the blade tip

Correct Answer:

Downward air velocity drawn through the rotor disc that reduces the effective angle of attack for a given mechanical pitch setting

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