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cyclogyro
The cyclogyro, or cyclocopter, is an aircraft design that uses cycloidal rotors which consist of airfoils rotating around a horizontal axis for both lift and thrust. They are capable of vertical take off and landing and hovering performance like a helicopter, without the same disadvantages such as limited forward speed, very high noise and vibration levels, limited flight altitude etc. The biggest hope of Cyclocopter developers which remains unrealised in any flying prototypes is to achieve higher efficiency in terms of lift per engine horsepower (aka Power Loading) which would translate into higher lifting capability and longer flight range. Although a number of cyclogyros were built in the 1930s, none were known to have successfully flown until 2011. The cyclogyro should not be mistaken for flettner airplanes, the unsuccessful and aerodynamically different aircraft designs using cylindrical wings which attempted to harness the Magnus effect.
==Function==
The cyclogyro wing resembles a paddle wheel, with airfoils replacing the paddles. The airfoils' pitch (angle of attack) is adjusted either collectively (by means of a control ring with links to all blades, which is located eccentrically and variably relative to the rotor's axis of rotation) or the blades are individually adjustable in pitch and are adjusted continually by the control system as they move around the rotor's axis. In normal forward flight the airfoils are given a slight positive pitch at the upper and forward portions of their arc, producing lift and forward thrust. They are given flat or negative pitch at the bottom, and are "flat" through the rest of the circle to produce little or no lift in other directions. The pitch can be adjusted to change the thrust profile, allowing the cyclogyro to travel in any direction.〔(The Development of cyclogyro )〕 Differential thrust between the two wings (one on either side of the fuselage) can be used to turn the aircraft around its vertical axis, although conventional tail surfaces are generally used as well.〔(The Cyclogyros, Planned paddle-wheel aeroplanes )〕
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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