30 Questions
Match the following helicopter movements with their corresponding actions:
Yaw = Rotation around the vertical axis Pitch = Rotation around the lateral axis Roll = Rotation around the longitudinal axis Autorotation = State of flight where the main rotor system is being turned by the action of the relative wind passing up through the disc, rather than engine power
Match the following helicopter components with their corresponding functions:
Main rotor disc = Tilts to control the helicopter's pitch attitude Anti-torque system = Controls the yawing movement around the vertical axis Vertical hinge, also called the drag hinge = Accommodates blade acceleration/deceleration Freewheeling unit = Allows the main rotor to continue turning even if the engine is not running
Match the following rotor blade movements with their corresponding effects:
Blade flaps up = Centers of mass move closer to the axis of rotation, causing the blade to accelerate Blade flaps down = Decelerates until it reaches the neutral, or level position Blade flaps up and down = Equalizes lift Retreating blade at high forward speed = Stalls because of a high angle of attack and slow relative wind speed
Which of the following is the correct definition of autorotation?
Autorotation is the state of flight where the main rotor system is being turned by the action of the relative wind passing up through the disc, rather than engine power.
Which axis does a helicopter yaw around?
Vertical axis
What is the primary function of the cyclic pitch control in a helicopter?
To control the pitch movement of the helicopter
True or false: The combination of blade flapping and slow relative wind acting on the retreating blade normally limits the maximum forward speed of a helicopter.
True
True or false: Coriolis effect causes the acceleration or deceleration of the rotor blade as a result of the blade's centre of mass moving closer to or further from the axis of rotation.
True
True or false: Autorotation is the state of flight where the main rotor system is being turned by the action of the relative wind passing up through the disc, rather than engine power.
True
Which of the following statements about blade flapping in a helicopter is true?
Blade flapping increases the angle of attack and associated lift
What is the term for the situation when the retreating blade of a helicopter stalls due to a high angle of attack and slow relative wind speed?
Retreating blade stall
What is the purpose of the vertical hinge, or drag hinge, in a fully articulated rotor system?
To accommodate blade acceleration and deceleration
What is the term for the state of flight where the main rotor system is being turned by the action of the relative wind passing up through the disc, rather than engine power?
Autorotation
Which axis does a helicopter pitch around?
Lateral axis
What is the primary function of the cyclic pitch control in a helicopter?
To tilt the main rotor disc forward or backward
What causes the acceleration or deceleration of the rotor blade in a helicopter as a result of the blade's center of mass moving closer to or further from the axis of rotation?
Coriolis effect
True or false: The combination of blade flapping and slow relative wind acting on the retreating blade normally limits the maximum forward speed of a helicopter.
True
True or false: In autorotation, the main rotor blades rotate at a higher speed compared to normal powered flight.
False
What controls the rotation around the vertical axis in a helicopter?
Anti-torque system
True or false: The retreating blade stalls in a helicopter due to a high angle of attack and slow relative wind speed.
True
True or false: The pitch angle of the main rotor blades must be reduced during autorotation by lowering the collective pitch.
True
True or false: The anti-torque system controls the pitching movement of a helicopter around the lateral axis.
False
Which of the following statements about blade flapping in a helicopter is true?
Blade flapping increases the angle of attack and associated lift.
Which of the following best describes the retreating blade stall in a helicopter?
The retreating blade stalls due to a high angle of attack and slow relative wind speed.
Which of the following is the correct definition of autorotation?
Autorotation is the state of flight where the main rotor system is being turned by the action of the relative wind passing up through the disc, rather than engine power.
Which of the following best describes the Coriolis effect in a helicopter?
The Coriolis effect causes the acceleration or deceleration of the rotor blade as a result of the blade's center of mass moving closer to or further from the axis of rotation.
Which of the following best describes the primary function of the cyclic pitch control in a helicopter?
The cyclic pitch control is used to control the pitch attitude of the helicopter by tilting the main rotor disc.
During autorotation, airflow enters the rotor disc from ______ as the helicopter descends.
below
To successfully change the downward flow of air to an upward flow during autorotation, the pitch angle of the main rotor blades must be reduced by lowering the ______.
collective pitch
A helicopter yaws around the ______ axis, pitches around the lateral axis, and rotates around the longitudinal axis.
vertical
Test your knowledge on helicopter rotor systems and their role in generating lift. Learn about the effects of coning and blade bending in a semirigid rotor system, as well as the significance of weight in helicopter operations.
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