Autorotation - Autorotation

Japanese: オートローテーション - おーとろーてーしょん
Autorotation - Autorotation

…Although it is sometimes called a gyroplane, gyroplane is originally a trademark of autogyro. An autogyro has a freely rotating rotor located at the top near the center of gravity of the aircraft. When the rotor is first turned slightly by hand, the rotor surface tilts slightly backward as the aircraft moves forward, allowing air to flow in from below, so the aircraft continues to rotate naturally (autorotation). However, a propulsion device is required for forward flight, and this is often an engine-driven propeller, similar to that of a normal airplane. …

From [Helicopter]

…Cyclic pitch control was first used by Pescara in his helicopter, where the blades, rigidly attached to the shaft, were periodically twisted. He also developed the autorotation system, which controlled the pitch of the blades to allow the rotor to rotate with the airflow from below during the fall, for a safe descent when the engines were shut down. The flapping mechanism was used in Baumhauer's first single rotor. …

*Some of the terminology that refers to "autorotation" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ジャイロプレーンgyro planeと呼ばれることもあるが,ジャイロプレーンは元来はオートジャイロの一商標名である。オートジャイロは,機体の重心付近の上部に自由に回転する回転翼をもち,この回転翼は,初めに手でちょっと回しておくと,機体の前進とともに回転面が若干後方に倒れて下方から空気が流入するので,自然に回転し続ける(オートローテーション)。ただし,前進飛行を行うための推進装置は必要であり,これにはふつうの飛行機と同様の,エンジン駆動のプロペラを用いることが多い。…

【ヘリコプター】より

…サイクリックピッチ制御を採用したのは,ペスカーラのヘリコプターで,シャフトに剛に取り付けられたブレードは周期的によじられた。また彼はエンジン停止のとき,安全に降下するため,ブレードのピッチを制御することで,落下に伴う下方からの空気流でローターを回転させるオートローテーションautorotationが利用できるようにした。 フラッピングの機構はバウムハウエルの最初の単ローターに採用されている。…

※「オートローテーション」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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