Patent ID: 7938001
Filing Date: 2011-05-10
Classification: G01P

Abstract:
1. A direction indicator comprising: a direction pointer arranged to pivot about a fulcrum and having a longitudinal axis; and a flight mounted on the direction pointer that is configured to interact with a fluid flow, the flight having a resistive portion that widens progressively away from the fulcrum and that projects from the direction pointer to form a first surface which extends transversely to the longitudinal axis of the direction pointer, said first surface protruding into the fluid flow when the direction pointer is aligned with the direction of that flow such that the resistive portion is resistive to fluid flow in a direction parallel to the longitudinal axis of the direction pointer, the resistive portion being substantially effective to cause the direction pointer to pivot about the fulcrum and thereby align the flight with the direction of the fluid flow; and wherein the flight terminates at its end furthest from the fulcrum with a substantially flat rear second surface transverse to the longitudinal axis of the direction pointer.