HELICOPTERS Flashcards
The rotor wings, or rotor blades, are attached to the __________.
Mast
Major components of modern helicopters.
Airframe
Fuselage
Landing Gear
Powerplant
Transmission
Main Rotor System
Tail Rotor System
Transfers power directly to the main and tail rotor systems.
Transmission
Provides the aerodynamic forces necessary to fly.
Main Rotor System
An anti-torque component that keeps the helicopter from turning due to torque.
Tail Rotor System
Newton’s third law of motion states…
…“To every action, there is an equal and opposite reaction.”
When a helicopter is hovering, it has a tendency to…
…drift laterally to the right caused by the lateral thrust supplied by the rotor.
The pilot may prevent lateral drift by tilting the…
…main rotor to the left, which counteracts the tail rotor thrust to the right.
The rotor system produces…
…centrifugal and centripetal force.
Has a propensity to make rotating bodies move away from the center of rotation.
Centrifugal Force
__________ counteracts __________ by keeping rotating bodies a certain radius from the center of rotation.
Centripetal Force
Centrifugal Force
The Coriolis Effect is also known as…
…the law of conservation of angular momentum.
The Coriolis Effect states…
…that an object will have the same velocity of momentum unless acted upon by an external force.
__________ accelerates as a rotating body moves closer to he axis of rotation.
Angular Momentum
As rotator blades move around their axis of rotation…
…there is a slight change in diameter due to the blades flapping.
The changes in diameter due to the blades flapping creates a small __________ resulting in __________.
acceleration and deceleration of the rotational velocity
fluctuations in lift
The phenomenon in which force applied to a rotating object is manifested 90 degrees later in the direction of rotation.
Gyroscopic Precession
Controls used to handle a helicopter.
Collective Pitch Control
Cyclic Pitch Control
Anti-Torque Pedals
Throttle Control
Used to change the pitch angle of the main rotor blades simultaneously.
Collective Pitch Control
As the pitch angle of the blade increases, __________ drag occurs.
More
As the pitch angle of the blade decreases, __________ drag occurs.
Less
__________ blade speed helps generate lift.
Faster
Used to fly the helicopter forward, backward, left, and right.
Cyclic Pitch Control
Used to change the pitch of the tail rotor blades, increasing or decreasing tail rotor thrust in a desired direction.
Anti-Torque Pedals
Used to control the power of the engine and ensures that the rotational speed of the rotor blades is in a desired range.
Throttle Control
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