Zero lift torque

The zero lift torque is the torque at the neutral point of a wing profile with no lift or downforce. It depends on the aerodynamically effective curvature (curvature and hollow curvature) and its position on the profile chord . At the neutral point, the air force always turns so that the wing nose is pressed and the wing trailing edge is lifted. This direction of rotation always has a negative value. Non-arched (symmetrical) or certain S-flapping profiles have no zero lift torque. The larger the arching and concave arching reserve, the higher the zero lift torque. The zero lift torque also determines the pressure point migration ${\displaystyle \!\,C_{m0}}$ and the corresponding stabilization effort for aircraft.

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• Schmitz, FW; Aerodynamics of the flight model; Aero, 1983, ISBN 3-934596-08-8
• Abbott, I.; v. Doenhoff, AE: Theory of Wing Sections; New York, 1949; ISBN 0-486-60586-8
• Althaus, D., Wortmann, FX: Stuttgart profile catalog; Braunschweig, 1981; ISBN 3-528-08464-2