induced drag

…Lift also faces slightly backwards at right angles to the airflow, so its horizontal component becomes resistance. This is called induced drag, a by-product of lift generation, and in order to increase the lift-to-drag ratio, it is first necessary to reduce it. To do this, it is best to increase the aspect ratio of the wing and move the wingtip vortex further to the left and right, so aircraft that require range and load capacity, such as transport aircraft, have slender wings with an aspect ratio of 7 to 12, and gliders have 20 to 30 (Figure 4-a). …

*Some terminology that mentions "induced drag" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…揚力も気流に直角にやや後ろを向くので，その水平成分が抵抗となる。これを誘導抗力induced dragといい，揚力発生の副産物で，揚抗比を上げるにはまずこれを減らす必要がある。それには翼のアスペクト比を増し翼端渦を左右に離すほどよいので，輸送機など航続性能や積載能力が要求される機種はアスペクト比7～12，グライダーは20～30もの細長い翼にしている(図4-a)。…

※「induced drag」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