Abstract
In order to design a variable pitch angle windmill, which generates maximum torque at each angle, it is necessary to know the dynamic characteristics of an aerofoil. The dynamic characteristics of an aerofoil, whose pitch angle changes with constant speed in uniform air flow, are investigated experimentally. The characteristics are uniquely determined by nondimensional pitch angle speed cd/U, where c, a, U are chord length, pitch angle speed and velocity of flow, respectively. The maximum lift coefficient increases with ca/U almost linearly, and the shapes of hysteresis loops in the lift and drag coefficients are determined by ca/U.
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