equivalent head wind

Japanese: equivalent head wind(英語表記)equivalentheadwind
equivalent head wind

...QNH is the value used to set the origin of the barometric altimeter to 10 feet above sea level.
[Aviation weather forecast related]
Equivalent head wind is the difference between the airspeed and the ground speed in the direction of an aircraft's flight, that is, the component of force in the direction of flight. If the wind is blowing at right angles to the airway, there is no airway wind component, but an aircraft cannot fly on the airway unless it takes a certain drift angle, so it has a headwind component. …

*Some of the terminology that refers to "equivalent head wind" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…QNHは気圧高度計の原点を海面10フィートに設定するための値である。
【航空気象予報関係】
相当向い風equivalent head wind航空機の進行方向における対気速度と対地速度の差,すなわち進行方向の分力のことである。いま航空路に風が直角に吹いている場合は航空路成分の風はないが,航空機はある偏流角をとらなければ航空路上を飛ぶことはできないため向い風成分をもつことになる。…

※「equivalent head wind」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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