Sikorsky VS-44 was a large four-engined flying boat

The Sikorsky VS-44 was a large four-engined flying boat built in the United States in the early 1940s by Sikorsky Aircraft. Based on the XPBS-1 patrol bomber, the VS-44 was designed primarily for the transatlantic passenger market, with a capacity of 40+ passengers. Three units were produced: Excalibur, Excambian, and Exeter, plus two XPBS-1 prototypes

In the early 1930s, the primary mode of long-distance air travel over oceans was in flying boats, due to the ease of constructing docking facilities on shore without having to construct runways, and the possibility of malfunction forcing a sea landing. One flying boat designer was Russian immigrant Igor Sikorsky who had founded Sikorsky Aero Engineering Company when he came to the US in 1919. In 1930, his company became a subsidiary of United Aircraft.

Operators

XPBS-1 patrol bomber

In March 1935, the United States Navy was making plans for a new patrol bomber that would have increased performance and weapon load capability from their newly procured Consolidated YP3Y-1. Prototypes were ordered from Sikorsky in June 1935 and Consolidated Aircraft in July 1936. Sikorsky's entry, the XPBS-1 (Bureau Number 9995), made its first flight on 9 September 1937, the Consolidated XPB2Y-1 on 17 December of the same year.