Aviation of World War II

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Transport flying boat

YRS-1 Sikorsky

The YRS-1 transport flying boat was a variant for the US Navy aviation of the S-43 "Baby Clipper" passenger amphibian - a smaller version of the four-engine S-42 "Clipper".

The aircraft was an all-metal monoplane with a wing raised above the fuselage on a pylon. Depending on the interior layout, the car could accommodate 18-25 passengers. The S-43 was supplied to airlines in the USA, Norway, Brazil and several other countries. In 1937, deliveries of such aircraft in transport versions to the US Army and Navy began. A total of 53 S-43s were produced, of which 22 were in military versions.

Power plant - two 9-cylinder air-cooled Pratt & Whitney R-1690-52 Hornet engines (750 hp). There were no weapons. Crew - 3-4 people. Capacity - 19 passengers.

In 1937-1939 17 units of OA-8 were delivered - a variant for the US Army, mainly corresponding to the JRS-1. In 1937, 5 aircraft were delivered, and in 1942, another former civilian aircraft, designated OA-11, was delivered.

After the United States entered World War II, a number of JRS-1s (sources give various figures - up to 10 vehicles) received bomb racks for 2 × 227 kg bombs (small arms were not installed) and in the first half of 1942 were used for anti-submarine patrols in Hawaii and the West Coast of the United States.

Subsequently, JRS-1 returned to transport tasks. The last of them were in operation until 1944; in the US Army, the OA-8 and OA-11 aircraft served as transport aircraft until the end of 1945.

Sikorsky YRS-1
Crew 4
Wing span, m 26.21
Wing area, m² 72.52
Length, m 15.70
Height, m 5.38
2 × PE Pratt & Whitney R-1690-52 Hornet, power hp. 2 × 750
Weights, kg
Empty weight 5,783
Loaded weight 8,850
Maximum speed, km/h 285
Cruise speed, km/h 246
Service ceiling, m 6,300
Service range, km 1,247
Payload, passengers up to 19
Photo Description
Drawing YRS-1
Transport flying boat YRS-1


  • "Encyclopedia of military equipment" /Aerospace Publishing/
  • "American military aircraft of World War II" /ed. David Donald