Fig. 2. Drag coefficient (C_D) for five crab specimens at orientation angles () from 0° to 90°. Based on the expected symmetry of the flow patterns around the crab (i.e. roughly symmetrical left to right and front to back), a functional form of cos(2) is assumed for the drag variation with orientation angle. A trend line based on linear regression is shown and yields an r² value of 0.84. A third-order polynomial fit with respect to yielded a similar r².