Patent ID: 6065334
Filing Date: 2000-05-23
Classification: B64D,F03D,F05B,G01P,Y02E

Abstract:
Device for rendering visible the direction of a fluid flow over a surface of an object, comprising a flap-like member which is joined in a hinged manner to said surface and which is located closer to or further away from said surface depending on said flow, wherein the surface of at least one side of said flap and that part of the surface of said object which is located on one side of the hinge line are constructed such that when said part of the surface is optically covered by said flap an optical appearance is obtained differing from the optical appearance in case when said part of the surface is not optically covered, wherein said flap-like member comprises a number of stall flaps, each being arranged to move entirely from one position to another without torsion taking place over the width of the flap.