Piasecki HRP Rescuer tandem rotor helicopter nicknamed "The Flying Banana". Twenty eight were built in the late 1940s.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...a_fullsize.jpg
Previously:
Laflamme LAF-01 tandem rotor helicopter - photo
Helicopter with intermeshing rotors - GIF
Sikorsky H-2 coaxial rotor helicopter - photo
Piasecki PA-97 Helistat hybrid aircraft - photo
Piasecki X-49 SpeedHawk compound helicopter - GIF
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