S-49/R-6A/hos-1/Hoverfly Mk II helicopter sikorsky s-49/R-6a army Serial No. 43-45379



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S-49/R-6 Development Timeline


  • April 30, 1943. Cost plus fixed fee contract for six XR-6 helicopters signed.

  • October 15, 1943. First Flight of the XR-6

  • September 1943. Contract negotiated with Nash-Kelvinator to build R-6 helicopters. Sikorsky contracted to provide engineering services and dynamic components.

  • August 28, 1943. Production contract for Nash-Kelvinator to build 900 Sikorsky R-6A helicopters under license signed.

  • March 2, 1944. XR-6A set unofficial nonstop distance record of 397 miles in 4 hours 55 minutes.

  • September 1944 First XHOS-1 delivered to USN and transferred to USCG Air Station Floyd Bennett Field.




  • October 23, 1944. First Nash-Kelvinator R-6A helicopter accepted by USAAF.




First YR-6A Helicopter completed by Nash-Kelvinator in Detroit



  • January 1945. Last XR-6A accepted by USAAF.

  • May 27, 1945. Three R-6A helicopters make first helicopter rescue in China. Three crewmen from a C-46 crash in the Yuan Chiang Valley are rescued nearly 100 miles from the helicopter base in Kunming, China.

  • July 14, 1945. Army R-6A helicopter dispatched to the Paricutin Volcano in Michoacán, Mexico to gather scientific information by hovering over the volcano. The scientists benefited by studying the lightning-like discharges with thunder within the erupting material and the Army gained experience with high altitude (over 8,700 feet), turbulence, and high temperature operations similar to those encountered in the South Pacific. Over 60 flights were conducted. Igor Sikorsky, an amateur volcanologist, accompanied the expedition.



R-6A flies over Paricutin volcano in Mexico July, 1945


  • August 16, 1945. Nash-Kelvinator R-6A contact cancelled after 219 of 900 helicopters ordered were completed.

  • July 1, 1946. VX-3 (Helicopter Development Squadron Three), the U.S. Navy’s first helicopter Squadron is formed at NAS New York with 7 HOS-1 (R-6) and numerous HSN-1 (R-4) helicopters transferred from the U.S. Coast Guard.

  • July-October 1946. First four helicopter Detachment of VX-3 HOS-1 helicopters embarked on USS Saidor (CVE-117) and joined Operation Crossroads to collect data during Atomic Testing at Bikini Atoll in the Marshall Islands. The helicopters retrieved film from camera towers that were inaccessible using any other means. During the trip from the east coast to the west coast a VX-3 HOS-1 became the first helicopter to fly nonstop from the Atlantic to the Pacific ocean along the Panama Canal

  • September 20, 1946. A U.S. Coast Guard HOS-1G from CGAS Floyd Bennett is disassembled, loaded in a C-54, and reassembled in Gander, Newfoundland to assist in rescuing 16 survivors of a SABENA airlines DC-4.

  • December 1947. Captain Clayton Marcy, the CO of VX-3, completes the first transcontinental helicopter trip from Lakehurst, NJ to San Diego, California in a HOS-1 helicopter.

  • May 1949. Last USCG HOS-1G is retired from service.

  • August 1951. Last RAF Hoverfly Mk II is retired from service.




VX-3 Sikorsky HOS-1 takes off from a Seaplane Tender



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