The Sikorsky S-33 Messenger was an American two-seat sesqiuplane designed and built by the

Sikorsky Manufacturing Corporation Sikorsky Aircraft is an American aircraft manufacturer based in Stratford, Connecticut. It was established by aviation pioneer Igor Sikorsky in 1923 and was among the first companies to manufacture helicopters for civilian and military use. Pr ...

in 1925. The first of two examples built participated in the Sixth Pulitzer Trophy Race at Mitchel Field, Long Island, New York on October 12, 1925 and was piloted by Al Krapish, an employee of Sikorsky. The first aircraft is reported to have been powered by a Wright Gale of and the second by a Lawrance L-3 of . These were essentially the same engine type, post- and pre- acquisition of the

Lawrance Aero Engine Company Lawrance Aero Engine Company was an American aircraft engine manufacturer. Founded by engine pioneer Charles Lawrance, it designed one of the first successful air-cooled radial engines. It existed for only 5 years, being acquired by Wright Aeronau ...

by the Wright Aeronautical Corporation, respectively. Some sources assert that the aircraft was powered by an

Anzani Anzani was an engine manufacturer founded by the Italian Alessandro Anzani (1877–1956), which produced proprietary engines for aircraft, cars, boats, and motorcycles in factories in Britain, France and Italy. Overview From his native Italy, An ...

engine, but this is most likely to be a mis-identification.

Specifications (first aircraft)

References

1920s United States civil utility aircraft S-031 Sesquiplanes Single-engined tractor aircraft Aircraft first flown in 1925 {{aero-1920s-stub