Controllable Pitch Propeller - Controllable Pitch Propeller

Japanese: 可変ピッチプロペラ - かへんピッチプロペラ

A propeller for an airplane or ship whose pitch can be freely changed while the aircraft is in flight. In airplanes, the pitch is increased at high speeds and decreased at low speeds such as during takeoff or ascent to increase the efficiency of the propeller. In addition to constant-speed propellers, which use a governor to automatically change the pitch according to flight conditions while keeping the propeller speed constant, feathering propellers, which can orient the propeller blades in the direction of the aircraft's movement to minimize propeller resistance when the engine is stopped, and reversible pitch propellers, which can act as brakes when landing, are also widely used. Controllable pitch propellers, which keep the engine speed constant and can freely change the propeller pitch from forward to reverse, are also in practical use on ships.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

飛行機または船のプロペラで航行中ピッチを任意に変えられるもの。飛行機では高速時にピッチを大きく，離陸，上昇などの低速時には小さくして，プロペラの効率を高める。調速機で，プロペラ回転数を一定にしたまま飛行状況に応じピッチを自動的に変化させる定回転プロペラ（定速プロペラ）のほか，エンジン停止時などにプロペラの抵抗を最小にするため，プロペラ羽根を機の進行方向に向けることのできるフェザリングプロペラ，着陸時にブレーキ作用を行える可逆ピッチプロペラも広く利用されている。船でも機関の回転は一定で，プロペラのピッチを前進から後進まで自由に変えることのできる可変ピッチプロペラが実用化されている。

出典　株式会社平凡社百科事典マイペディアについて　情報

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