glide ratio

…The angle that the flight path makes with the horizontal plane during gliding is called the glide angle or descent angle. The ratio H / X of the horizontal flight distance traveled by gliding from a certain altitude H to X is the tangent of the glide angle, and its reciprocal X / H is called the glide ratio, which is equal to the ratio of lift L to drag D , or the lift-drag ratio L / D . During gliding, the cosine of gravity is balanced with the lift, and the sine is balanced with the drag. …

*Some of the terminology explanations that mention "glide ratio" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また滑空時に飛行経路が水平面となす角を滑空角glide angleまたは降下角と呼ぶ。ある高度Hから滑空して進んだ水平飛行距離Xとの比H/Xが滑空角の正接で，その逆数X/Hを滑空比glide ratioといい，その値は揚力Lと抗力Dとの比，いわゆる揚抗比L/Dに等しい。滑空時には，重力の余弦が揚力と，そして正弦が抗力とつり合っている。…

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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