Fig. 11. Schematic, not to scale, for evaluating the drag force and torque acting on a medial or lateral mechanoreceptor sensillum contained in a plane passing through the flagellum axis and oriented at an angle with respect to the local tangent to the flagellum surface. The velocity component, U_x(y), inducing the drag and torque is normal to the plane of the figure and, at any location along the sensillum, U_ns()=U_x(y) where y=sin.