SACAA PPL (H) Aircraft Technical Practice Questions - SACAA Private Pilot Licence (Helicopter) Aircraft Technical & General Knowledge Examination Exam

Why are hydraulic or mechanical drag dampers installed on the drag hinges of a fully articulated main rotor hub?

To prevent the blades from teetering into the tail boom during low RPM shutdown To control and damp lead-lag oscillations caused by Coriolis effect, preventing ground resonance To lock the blade pitch angle during high-speed autorotative descents To balance aerodynamic lift between advancing and retreating blades in forward flight

Correct Answer:

To control and damp lead-lag oscillations caused by Coriolis effect, preventing ground resonance

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