Dihedral angle

Japanese: dihedral angle（英語表記）dihedralangle

…If the plane tilts to the left, as in Figure 11-c, it starts to skid to the left and the wind hits it from the right. When the wings are gradually rising toward the wingtip as seen from the front, the angle between the wing reference plane and the horizontal plane is called the dihedral angle. If the wings have a dihedral angle as shown in the figure, the angle of attack of the left wing, and therefore its lift, is larger than that of the right wing, and a moment is generated to return the lateral tilt to the original position. This is lateral stability. …

From [Wings]

…Down-twisting is used to prevent wingtip stall (a wing stall that starts at the wingtip, which can cause the aircraft to suddenly tilt to the side), to reduce induced drag, and to balance the aircraft vertically on tailless aircraft. The dihedral angle is the curvature of the wing relative to the horizontal plane when viewed from the front, and gives the aircraft the ability to return to a horizontal attitude when it tilts to the side and begins to skid. [Kuse Shinji] …

*Some of the terminology that mentions "dihedral angle" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…図11-cのように，もし機が左に傾くと，機は左のほうに横滑りを始め，風が右から当たるようになる。前から見て，翼が翼端に向かってしだいに上がっている場合，主翼基準面と水平面とのなす角を上反角dihedral angleというが，図のように主翼に上反角がついていると，左翼の迎え角，したがってその揚力が右翼より大きくなり，横の傾きを元に戻すモーメントが生ずる。これが横安定である。…

【翼】より

…ねじり下げは翼端失速(翼の失速が翼端のほうから始まることで，これが生ずると機は急に横に傾きやすい)を防いだり，誘導抗力を減らしたり，無尾翼機で縦のつりあいをとるためにつける。上反角dihedral angleは翼を前から見たときの水平面に対する反りで，機が横に傾き横滑りを始めたとき水平姿勢に戻る性質を与える。【久世紳二】。…

※「dihedral angle」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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