Operated be the US Air Force, refitted with metal rotor blades.
Design authority: Sikorsky Aircraft Corp.
Primary manufacturer: Sikorsky Aircraft Corp.
Parent type: Sikorsky S-51
Aircraft status: Status unknown
VTOL type: Helicopter
Lift devices: 1 Single main rotor
Dedicated control device: 1 Tail rotor
Crew required: TBA in Side-by-side arrangement
Landing gear: Wheels (non-retractable)