The McDonnell XHJH Whirlaway, a.k.a. McDonnell Model 37, is a 1940s American experimental transverse-rotor helicopter designed and built by McDonnell Aircraft Corporation for the United States Navy and was the largest helicopter at the time, as well as the first successful twin-engined twin-rotor helicopter in the world.
The McDonnell XHJH Whirlaway, a.k.a. McDonnell Model 37, is a 1940s American experimental transverse-rotor helicopter designed and built by McDonnell Aircraft Corporation for the United States Navy and was the largest helicopter at the time, as well as the first successful twin-engined twin-rotor helicopter in the world.
Source: Wikipedia "McDonnell XHJH Whirlaway" · CC BY-SA 4.0
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