EASA Part-66 Module 12: Helicopter Aerodynamics, Structures & Systems
Rotor theory, transmissions and rotary-wing systems.
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Interactive simulations
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Sample exam questions
Real Part-66-style multiple choice with explanations. Options are shuffled each attempt, just like the exam.
Rotary-Wing Aerodynamics, quiz
1. The collective control changes
The pitch of all rotor blades together (total thrust)The pitch of one blade onlyOnly the tail-rotor pitch2. The cyclic control
Tilts the rotor disc to move the helicopter horizontallyChanges engine RPMFeathers the tail rotor3. The tail rotor provides
Anti-torque and yaw controlMain liftForward thrust only4. Dissymmetry of lift in forward flight is corrected by
Blade flappingIncreasing engine RPMThe tail rotor5. The advancing blade flaps UP, which
Reduces its angle of attack (reducing its lift)Increases its angle of attackStops it rotating6. A control input takes effect about 90° later in the direction of rotation because of
Gyroscopic precessionGround effectTranslational lift7. After an engine failure the rotor keeps turning because the
Freewheel (sprag) unit disconnects the engine and the rotor autorotatesThe battery drives the rotor through an electric motor until the aircraft is on the groundThe tail rotor drives the main rotor back through the gearbox once the engine has stopped8. A helicopter's maximum forward speed is ultimately limited by
Retreating-blade stallTail-rotor failureFuel flow
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