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The Sikorsky S-43was twin engine amphibious aircraftmanufactured in USA during the 1930s by the American firm Sikorsky Aircraft.

Sikorsky S-43 (JRS-1)
U.S. Navy Sikorsky JRS-1 in 1945


Airline service

The Norwegian Sikorsky S-43 LN-DAG Valkyrien at Gressholmen Airport near Oslo in 1936.

The S-43 first flew in 1935 and was a smaller version of the Sikorsky S-42 "Clipper". It accommodated between 18 and 25 passengers, with a separate two-crew forward cockpit.[1] The S-43 was known as the "Baby Clipper" in airline service.

It was used primarily by Pan American World Airways for flights to Cuba and within Latin America. Two were also flown by Reeve Aleutian Airways in Alaska and three were used by Inter-Island Airways of Hawaii, the predecessor to modern-day Hawaiian Airlines, to ferry Pan-Am Clipper passengers and local residents from Honolulu to the other islands. One aircraft was purchased by Norwegian airline Det Norske Luftfartselskap.

Military service

Sikorsky S-43 preserved at Pima Air & Space Museum, Tucson AZ, in 2005, painted to represent a USMC JRS-1 of VMJ-2 Squadron.

Five aircraft were acquired by the U.S. Army Air Corps in 1937 under the designation OA-8 and were used for transport of freight and passengers.[2] 17 aircraft were procured by the U.S. Navy between 1937 and 1939 as the JRS-1, two of which served the U.S. Marine Corps. One JRS survived in service at the end of 1941. [3]

In total, approximately 53 S-43s were built, including examples of the twin-tailed S-43B.[4]

Executive service

Two aircraft went to private owners: Harold Vanderbilt and Howard Hughes. Hughes' S-43 remains the last example of this aircraft type flying [1].

Specifications (S-43)


General characteristics

  • Crew: two (pilot, copilot)
  • Capacity: 15 passengers
  • Length: 51 ft 2 in (15.60 m)
  • Wingspan: 86 ft 0 in (26.21 m)
  • Height: 17 ft 8 in (5.38 m)
  • Wing area: 781 ft² (72.5 m²)
  • Empty: 12,750 lb (5,783 kg)
  • Loaded: lb ( kg)
  • Maximum takeoff: 19,096 lb (8,662 kg)
  • Powerplant:Pratt & Whitney R-1690-52 radials, 750 hp (560 kW) each


  • Maximum speed: 190 mph (306 km/h)
  • Range: 775 miles (1,247 km)
  • Service ceiling: 20,700 ft (6,310 m)
  • Rate of climb: ft/min ( m/min)
  • Wing loading: lb/ft² (115.84 kg/m²)
  • Power/mass: hp/lb ( kW/kg)


  1. ^ Simpson, 2001, p. 499
  2. ^ Swanborough, 1963, p. 528
  3. ^ Swanborough, 1990, p. 524
  4. ^ Simpson, 2001, p. 499
  • Simpson, Rod (2001). Airlife's World Aircraft. Airlife Publishing Ltd. ISBN 1-84037-115-3.  
  • Swanborough, Gordon (1963). United States Military Aircraft since 1909. Putnam & Co. Ltd. ISBN none.  
  • Swanborough, Gordon (1990). United States Navy Aircraft since 1911. Putnam Aeronautical Press. ISBN 0-87021-792-5.  


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