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The R-4 was the world's first large-scale mass-produced helicopter and the first helicopter used by the United States Army Air Forces, [1] the United States Navy, the United States Coast Guard and the United Kingdom's Royal Air Force and Royal Navy. In U.S. Navy and U.S. Coast Guard service, the helicopter was known as the Sikorsky HNS-1.
In use by RAF and FAA Avro 671 "Rota" Mk.1 (licence-built Cierva C.30A) (general purpose autogyro - used for radar station testing) Bristol "Heliogyro" RI/II (experimental helicopter) Cierva W.5 - 2-seater twin outrigger rotor helicopter, first flight 1938. Cierva W.6 - twin rotor helicopter, flown in 1939
First helicopter tested by the USAAF. [1] 1941 Never 2 Sikorsky R-4: Sikorsky Aircraft Corporation: World's first large-scale mass-produced helicopter and the first helicopter used by the United States Army Air Forces. [2] 1942 Unknown 131 Sikorsky H-5: Sikorsky Aircraft Corporation 1943 1945 300 Sikorsky R-6: Sikorsky Aircraft Corporation ...
Sikorsky HNS - Helicopter; Sikorsky HO2S - Helicopter; Sikorsky HO3S - Helicopter; Sikorsky JRS - Transport amphibian; Sikorsky JR2S - Impressed transport flying boat; Sikorsky XPBS-1 - Patrol flying boat; Stearman N2S - Trainer; Stinson OY Sentinel - Observation/liaison aircraft; Stinson R3Q - Trainer/utility aircraft; Spartan NP - Trainer
List of United States Air Force aircraft designations (1919–1962) List of United States Navy aircraft designations (pre-1962) List of United States Army aircraft designations (1956–1962) List of United States Tri-Service aircraft designations; List of U.S. DoD aircraft designations; List of undesignated military aircraft of the United States
During World War II, Flettner Fl 282s were used in Germany for reconnaissance, and Sikorsky R-4s were used by the United States to rescue downed aircrews and injured personnel in remote areas of the China Burma India Theater, from April 1944 until the war's end.
If the date of an aircraft's entry into service or first flight is not known, the aircraft will be listed by its name, the country of origin or major wartime users. Aircraft used for multiple roles are generally only listed under their primary role unless specialized versions were built for other roles in significant numbers.
The linchpin of US Army tactics was the helicopters, and the protection of those helicopters became a vital role. [2] It became clear that unarmed troop helicopters were vulnerable against ground fire from Viet Cong and North Vietnamese troops, particularly as they approached landing zones to disembark or embark troops.