Term
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Definition
| Pilot control longitudinal and lateral movement with a joystick to her front center. Controls tilt of main rotor. |
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Term
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Definition
| Controls pitch by lifting or lowering the handle, as well as engine torque by means of a throttle rotates around the handle. |
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Term
| Directional control system |
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Definition
| the pilot controls the tail rotor torque. Controlled by tail rotor pedals at the pilot's feet. |
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Term
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Definition
| occurs in single-rotor helicopters when lateral cyclic is applied. At the rear half of the rotor disc, downwash is greater that the for the forward half of the disc. For conventional American helicopters (whose rotors turn counter-clockwise), a left cyclic input will cause a temporary increase in torque and a cyclic input will cause a temporary drop in torque. |
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Term
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Definition
| the action of turning a rotor system by airflow rather than engine power. |
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Term
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Definition
| additional lift the helo gets when it flies out from own downwash, which has a cushioning effect when the helo is low enough |
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Term
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Definition
| a force applied to a spinning disc has its effect happen 90º later in the direction and plane of rotation |
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Term
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Definition
| Spin accelerates when the center of mass of the rotor blades are closer to the axes of rotation. Another example is an ice skater bringing his arms in to spin faster. |
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Term
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Definition
| when air flowing over the rear portion of the main rotor disc is accelerated downward by the main rotor, which causes the rear portion to have a smaller angle of attack. Results in less lift to the rear portion, which is felt 90º later. |
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