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Helicopter flight controls
A helicopter pilot manipulates the helicopter flight controls to achieve and maintain controlled aerodynamic flight.〔Gablehouse, Charles (1969) ''Helicopters and Autogiros: a History of Rotating-Wing and V/STOL Aviation.'' Lippincott. p.206〕 Changes to the Aircraft flight control system transmit mechanically to the rotor, producing aerodynamic effects on the rotor blades that make the helicopter move in a deliberate way. To tilt forward and back (pitch) or sideways (roll), requires that the controls alter the angle of attack of the main rotor blades ''cyclically'' during rotation, creating differing amounts of lift (force) at different points in the cycle. To increase or decrease overall lift requires that the controls alter the angle of attack for all blades ''collectively'' by equal amounts at the same time, resulting in ascent, descent, acceleration and deceleration.
A typical helicopter has three flight control inputs—the cyclic stick, the collective lever, and the anti-torque pedals.〔(Flying a Helicopter ) at helis.com〕 Depending on the complexity of the helicopter, the cyclic and collective may be linked together by a ''mixing unit'', a mechanical or hydraulic device that combines the inputs from both and then sends along the "mixed" input to the control surfaces to achieve the desired result. The manual throttle may also be considered a flight control because it is needed to maintain rotor speed on smaller helicopters without governors. The governors also help the pilot control the collective pitch on the helicopters main rotors, to keep a stable, more accurate flight.
== Controls ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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