Designed to produce maximum torque relative to its moment of inertia as for a given change in wind direction, it is rotated with the minimum of friction and is balanced to avoid bias towards any particular direction. Balanced vane with bearing mounted on steel pivot pillar terminates in 2.5 cm. BSP (Male) thread. Complete with locking nut, fitted with four arms with N.E.W.S. Overall size 40x40x40 cm. (Approx), All parts can easily be assembled for use.
