U.S. Patent Specifications

In an aircraft, a hollow stabilizing plane having a slot in each of its upper and lower surfaces leading into its interior, blower means in communication with said interior to cause an inward flow through said slots, valve means to direct the major flow through cither slot, pilot's steering means operably connected to said valve means to operate it, an auxiliary vane pivotally mounted to be sensitive to the wind direction, and means operably connecting it to said valve means to operate it and direct the flow to the slots differentially in accordance with the wind direction and to transmit a force to said pilot steering means.