SR1942American helicoptersSikorsky R-4The world's first mass-produced helicopterSikorsky · United States→B41945American helicoptersBell 47The first helicopter certified for civil useBell Helicopter · United States→SH1949American helicoptersSikorsky H-19 ChickasawUtility helicopter with the engine in the nose and the cabin under the rotor, used by many armed forces.Sikorsky · United States→PH1952American helicoptersPiasecki H-21 ShawneeTandem-rotor transport helicopter, nicknamed the "Flying Banana" for its bent fuselage.Piasecki Helicopter · United States→KH1953American helicoptersKaman HH-43 HuskieIntermeshing rotors: two rotors that turn through each otherKaman Aircraft · United States→BU1956American helicoptersBell UH-1 IroquoisOne of the most produced helicopters everBell Helicopter · United States→SS1959American helicoptersSikorsky SH-3 Sea KingTwin-engined helicopter for anti-submarine warfare and search and rescue, also used as Marine One.Sikorsky · United States→KS1959American helicoptersKaman SH-2 SeaspriteShip-based helicopter of the US Navy for anti-submarine warfare and rescue.Kaman Aircraft · United States→