Dual towline spin-recovery device

Abstract

A device which corrects aerodynamic spin wherein a parachute 38 exerts anti-spin forces on an aircraft 10 to effect spin recovery. The dual parachute towlines 30 and 32 are each attached to the parachute 38 and are attached to the rear fuselage equidistant to and on opposite sides of the aircraft centerline, at 25 and 27. As the parachute 38 is deployed during spin, the parachute force 40 acts through only the towline 30, and exerts its force outboard of center on the aircraft 10. As a result, the parachute exerts not only an anti-spin torque, but additionally causes the aircraft to roll, creating a gyroscopic anti-spin rolling moment. The additional anti-spin rolling moment facilitates spin recovery by permitting a relatively smaller parachute to accomplish spin recovery equivalent to that of a larger parachute attached to the center of the rear fuselage. The relatively smaller parachute enables spin recovery while minimizing the aerodynamic, structural and in-flight complications associated with larger parachutes and chute forces.

Dependencies are inferred from the claim text.