Sikorsky S-43

S-43 / JRS-1
General information
Type	Flying boat airliner
National origin	United States
Manufacturer	Sikorsky Aircraft
Designer	Igor Sikorsky
Primary users	Pan American Airways Hawaiian Airlines
Number built	53
History
Introduction date	1934
First flight	1935

The Sikorsky S-43 (sometimes referred to as the Baby Clipper) is a 1930s American twin-engine amphibious flying boat monoplane produced by Sikorsky Aircraft.

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 forward cockpit for the two crew.^[1] The S-43 was known as the "Baby Clipper" in airline service.

On April 14, 1936, an S-43 with a 500 kg (1,100 lb) payload, piloted by Boris Sergievsky, set an altitude record for amphibious aircraft when it reached an altitude of 27,950 ft (8,520 m) over Stamford, Connecticut, with designer Igor Sikorsky aboard.^[2]

Approximately 53 S-43s were built, including examples of the twin-tailed S-43B.^[1]

The S-43 was used primarily by Pan American World Airways for flights to Cuba and within Latin America. Inter-Island Airways of Hawaii (Inter-Island changed its name to Hawaiian Airlines in 1941) was the launch customer for the S-43.^[3] Inter-Island operated four S-43's to ferry Pan Am Clipper passengers and local residents from Honolulu throughout the Hawaiian Islands. Inter-Island sold its only twin-tail version to KLM.^[3] One aircraft was purchased by Norwegian airline Det Norske Luftfartselskap. Panair do Brasil operated seven aircraft. Five S-43s were used between 1937 and 1945 by the French company Aéromaritime on a colonial airway between Dakar (Senegal) and Pointe-Noire (Congo).^[4] Reeve Aleutian Airways owned two S-43s during the 1950s, one operational (N53294 purchased 1948 and trade for G-21 in 1957) and one for spares (fuselage at Alaska Aviation Heritage Museum). Another S-43 was operated in Alaska with an unknown operator, wrecked at Chignik, AK, 1950s.^[5]

The U.S. Army Air Corps acquired five aircraft in 1937 under the designation OA-8 for transport of freight and passengers.^[6] The U.S. Navy purchased 17 aircraft between 1937 and 1939 as the JRS-1, two of which served with the U.S. Marine Corps. One JRS survived by the end of 1941.^[7]

The Chilean Air Force (FACH) (formerly known as Fuerza Aérea Nacional (FAN)) in 1936 bought 2 S-43: No. 1 named "Magallanes" and the No.2 named "Chiloé," because that aircraft was going to use in the Línea Aérea Experimental Puerto Montt-Magallanes (Experimental Air Line from Puerto Montt to Magallanes) flying through the Patagonian fjords.^[8]

Two aircraft went to private owners: William Kissam Vanderbilt II and Howard Hughes.

Hughes' S-43 N440 was the last example to fly.^[9] It is now owned by Kermit Weeks, and was at the Fantasy of Flight Museum restoration facility, in Polk City, Florida awaiting reassembly and restoration, where it will never fly again.^{[needs update]}

A Sikorsky JRS-1 is displayed at the Smithsonian National Air & Space Museum's Steven F. Udvar-Hazy Center in Virginia, in an unrestored state. This aircraft was on duty at Pearl Harbor on December 7, 1941. It was acquired by the Smithsonian in 1960 and spent 51 years in storage before being placed on display in 2011. It is eventually planned to restore the aircraft. ^[10]

June 2, 1937

The Chilean Air Force S-43 (No. 2) capsized off Ancud, Chile, killing all nine on board.^[11]

August 2, 1937

A Pan American-Grace Airways (Panagra) S-43B (NC15065) crashed in the vicinity of Coco Solo in the Panama Canal Zone; all 14 on board died. The plane spiraled into the water at approximately 90 mph and was destroyed by an immediate explosion and fire. The most likely cause of the crash was a faulty gasoline system and/or sudden and severe rain. The pilot indicated he lost altitude twice in the three minutes before the crash.^[12]

August 8, 1937

A China National Aviation Corporation (CNAC) S-43W (named Chekiang) ditched at Chilang Point, Bias Bay, China, killing three of four crew; all seven passengers survived. The flying boat was forced to ditch due to bad weather. High waves broke one wing off; the eight survivors clung to the other wing until rescued.^[13]

April 25, 1938

Pan Am Flight 105, an S-43B (NC16932) stalled and crashed on landing off Kingston due to engine failure; all 18 passengers and crew survived, but the aircraft was written off.^[14]

August 13, 1939

A Pan Am S-43 (NC16933) crashed into Guanabara Bay off Rio de Janeiro due to loss of control following engine failure, killing 14 of 16 on board.

May 17, 1943

Hughes crashed his S-43 into Lake Mead, killing CAA inspector Ceco Cline and Hughes employee Richard Felt. The aircraft was later raised and restored to flying condition.

August 3, 1945

Pan Am Flight 216, an S-43 (NC15066), crashed on landing at Fort de France Hydrobase due to weather and pilot error, killing four of 14 on board.^[15]

January 3, 1947

A Panair do Brasil S-43B (PP-PBN) crashed in the Amazon River at São Paulo de Olivenca, killing 11 of 14 on board.^[16]

Data from ,^[17] American flying boats and amphibious aircraft : an illustrated history^[18]

General characteristics

• Crew: Two
• Capacity: 19 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: 780.6 sq ft (72.52 m²)
• Airfoil: root: NACA 2218; tip: NACA 2212^[19]
• Empty weight: 12,750 lb (5,783 kg)
• Gross weight: 19,500 lb (8,845 kg)
• Fuel capacity: 100 US gal (83 imp gal; 380 L) in four wing tanks
• Powerplant: 2 × Pratt & Whitney R-1690-52 Hornet 9-cylinder air-cooled radial piston engines, 750 hp (560 kW) each at 7,000 ft (2,100 m)
• Propellers: 3-bladed Hamilton Standard variable-pitch propellers

Performance

• Maximum speed: 178 mph (286 km/h, 155 kn) at sea level

190 mph (170 kn; 310 km/h) at 7,000 ft (2,100 m)

• Cruise speed: 166 mph (267 km/h, 144 kn) at 7,000 ft (2,100 m)
  
• Landing speed: 64 mph (56 kn; 103 km/h)
• Range: 775 mi (1,247 km, 673 nmi) at 7,000 ft (2,100 m) at 70% power
• Service ceiling: 19,000 ft (5,800 m)
• Rate of climb: 1,000 ft/min (5.1 m/s)
• Wing loading: 25 lb/sq ft (120 kg/m²)
• Power/mass: 13 lb/hp (7.9 kg/kW)

Related development

• Sikorsky S-42

Related lists

• List of flying boats and floatplanes
• List of aircraft of World War II

• Simpson, Rod (2001). Airlife's World Aircraft. Airlife Publishing Ltd. ISBN 1-840371153.
• Swanborough, Gordon (1963). United States Military Aircraft since 1909. Putnam & Co. Ltd.
• Swanborough, Gordon (1990). United States Navy Aircraft since 1911. Putnam Aeronautical Press. ISBN 0-870217925.

• Video - Howard Hughes Sikorsky S-43
• Design and Construction Details of the New Sikorsky S-43 Amphibian – Aero Digest