Sikorsky HNS-1 (YR-4B) Hoverfly Helicopter: Sikorsky's HNS-1 helicopter was test flown at Langley in March 1945. This example was initially ordered by the Army, and carries an Army serial number. Jack Reeder, the NACA's first helicopter pilot, is at the controls. This "Hoverfly" was also used for pilot training in rotary winged flight.
