Here's the iconic McDonnell XHJH-1, shown here in front of the McDonnell plant. It was an experimental transverse-rotor helicopter and the first successful twin-engined twin-rotor helicopter in the world. It had twin side-by-side 46 ft (14 m) rotors at the end of pylon wings which turned in opposite directions. Each rotor was powered by a 450 hp (336 kW) Pratt & Whitney R-985-AN-14B Wasp Junior engine.
Its first designation XHJD-1 was on 27 April 1946, it was changed to XHJH-1 prior to its first flight.
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