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22 Cards in this Set
- Front
- Back
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What are the major components of a helicopter?
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The cabin, airframe, landing gear, powerplant, transmission, main rotor system, and tail rotor system
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What does the cabin area carry?
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The cabin is where the payload and crew are carried
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What main components are attached to the airframe?
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The powerplant or engine and the transmission.
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What is the job of the transmission on the helicopter?
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It takes the power of the engine and transmits it to the main rotor, which provides the aerodynamic forces that make helicopters fly.
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Helicopters can have a _____ _______
rotor or a ______ rotor system |
single main
dual |
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What are the three classifications of rotor systems.
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Fully articulated, semi-rigid, or rigid
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What are fully articulated rotor systems?
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Usually consists of 3 or more blades. The blades are aloud to flap, feather, and lead or lag independently of each other.
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What does feathering mean on rotors?
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The changing of the pitch angle of the rotor blades.
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Rigid rotor systems cannot flap or lead and lag, but they can be ______
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feathered
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Semi rigid rotors allow for two different movements. What are they?
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Flapping and feathering. This allows the blades to see saw together. As one blade flaps down the other flaps up
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What does the antitorque produce?
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It produces thrust to oppose torque and helps prevent the helicopter from turning in the opposite direction of the main rotor.
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What is Fenestron on the helicopter?
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Fan in tail design of the antitorque rotor.
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What is the Notar system?
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Uses a low pressure air that is forced into the tailboom by a fan mounted within the helicopter for directional control
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Common type of landing gear on a helicopter
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Skids
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What is an airfoil?
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Is any surface such as an airplane wing or a rotor blade, that provide aerodynamic force when it interacts with a moving stream of air
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Symmetrical Blades have
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the same camber. the upper and lower curvatures are the same
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asymmetrical rotor blades
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vary on curvatures
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When referring to an airfoil, the span
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is the distance from the rotor hub to the blade tip.
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What are the flight controls?
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The cyclic pitch control, the collective pitch control, the throttle, the anti-torque pedals
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what is relative wind created by
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It is created by the motion of an airfoil through the air, by the motion of air past an airfoil, or by a combination of both
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Relative wind may be affected by what factors
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rotation of the rotor blades, horizontal movement of the helicopter, flapping of the rotor blades, and wind speed and direction
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For a helicopter relative wind is
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the flow of air with respect to the rotor blades
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