Fig. 8. Ratios of thrust T and torque Q acting on the bristled wing in accelerating rotation (=20 ° and =45 °) to those on the solid wing. t, time (s); T_0r, period of acceleration phase in rotational motion; , angle of attack. Open circles, T at =20 °; filled circles, Q at =20 °; open squares, T at =45 °; filled squares, Q at =45 °.