Hughes Aircraft’s Giant Helicopter, XH-17, 1953

‘The XH-17 “Flying Crane” was the first helicopter project for the helicopter division of Hughes Aircraft.

‘To speed construction, parts of the XH-17 were scavenged from other aircraft. The front wheels came from a B-25 Mitchell and the rear wheels from a C-54 Skymaster. The fuel tank was a bomb bay-mounted unit from a B-29 Superfortress. The cockpit was from a Waco CG-15 and the tail rotor from a Sikorsky H-19 was used for yaw control.’

‘It still holds the record for flying with the world’s largest rotor system. Only one unit was built, since the aircraft was too cumbersome and inefficient to warrant further development.’

- Wikipedia