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Fig. 3. Experimental apparatus used to measure the fluid-dynamic forces of a wing in rotational motion (constant-velocity rotation and accelerating rotation). The measuring system (MS) comprises a load cell and a motor. X, Y, Z, earth-fixed coordinate system; x, y, z, wing-fixed coordinate system; LX, LY, LZ, dimensions of the tank; LZ1, depth of liquid; 0.5LX, 0.5LY, 0.5LZ, position of a root of a wing.