motor glider

Japanese: motor glider(英語表記)motorglider
motor glider

...an aircraft with fixed wings like an airplane, but without any propulsion power, that uses updrafts to ascend and glide long distances. An aircraft with a small engine and thrusters that can take off and ascend under its own power, then shuts off the engine in mid-air to glide, is called a motor glider.
[Principle of gliding]
An aircraft with fixed wings can stay in the air by using the aerodynamic forces acting on the wings as it moves forward. Of these aerodynamic forces, the force acting perpendicular to the direction of travel is called lift, and the force acting backward, parallel to the direction of travel, is called drag.

*Some of the terminology that mentions "motor glider" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…飛行機のように固定翼をもつが,推進のための動力はもたず,上昇気流を利用して上昇したり,長距離を滑空する航空機。小型のエンジンと推進器をもち,自力で離陸,上昇し,空中でエンジンを止めて滑空を行うものはモーターグライダーmotor gliderという。
[滑空の原理]
 固定翼をつけた航空機は,前進することで翼に働く空気力を利用して空中に浮くことができるが,この空気力のうち,進行方向に垂直上向きに働く力を揚力,進行方向に平行で後向きに働く力を抗力と呼ぶ。…

※「motor glider」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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