primary

Japanese: primary
primary

...Large gliders were developed for transporting troops, military and supplies during World War II, but after the war, glider flying became the predominant sport. In the past, glider piloting training consisted of three stages: primary gliders for the very basics, secondary gliders for intermediate training, and soarers with a lift-to-drag ratio of over 30. However, today, training begins with two-seater soarers, and the primary and secondary gliders have disappeared.
[Glider Performance]
As mentioned in the principle section, the greater the lift-to-drag ratio of a glider, the farther it can fly.

From [Wings]

…The remex (plural remiges), also called flight feathers, are the main organs of flight and are attached directly to the wing bones. Of these, those attached to the palm and the second and third phalanges are called primary flight feathers, and those attached to the ulna are called secondary flight feathers. The innermost secondary flight feathers are sometimes called tertiary flight feathers because they are different in length and shape from the others. …

*Some terminology explanations that mention "primary" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…第2次世界大戦では兵員,軍事,物資の輸送用に大型のグライダーも開発されたが,戦後は再びスポーツとしてのグライダーがもっぱらである。 なお,かつてはグライダーの操縦訓練において,ごく初歩の訓練用のプライマリーprimary,中級訓練用のセコンダリーsecondaryと呼ばれる機体での訓練を経て,揚抗比が30を超すような高性能のソアラーsoarerに進むという3段階がとられていたが,現在では初歩からソアラーの複座機で訓練が行われており,プライマリー,セコンダリーは姿を消している。
[グライダーの性能]
 原理のところで述べたように,グライダーでは揚抗比が大きくなるほど遠くまで飛行することができる。…

【翼】より

…風切(かざきり)羽remex(複数はremiges)は飛羽flight featherともいわれ,主要な飛行器官で,翼の骨に直接ついている。そのうち,腕掌骨と第2・3指の指骨に付着しているものを初列風切primaryといい,尺骨に付着しているものを次列風切secondaryという。また次列風切の内側の数枚は,他のものと長さや形状が違うので,三列風切tertiary(tertial)として区別されることがある。…

※「primary」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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