機翼的上表面與下表面距離之間一半的點連線稱為中弧線(mean camber line)或弧線(camber line)。而弧度(camber,又稱彎度),是弧線與翼弦線間最大的距離。弧度由翼弦量起,往上為正,往下為負[1][2]。正的弧度在機翼攻角為零度時會提供正的升力,反之則提供負升力。
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