The Sikorsky S-19 was a Russian twin-engine experimental prototype biplane aircraft built late in 1916 by the Russian Baltic Railroad Car Works while Igor Sikorsky was chief engineer of the aircraft manufacturing division.
The S-19 was a two bay biplane powered by two Sunbeam Crusader water-cooled V-8 engines installed in a push-pull configuration. Arranged as a twin-boom aircraft, it had a large rudder located in the center of the empenage. Two crew members occupied cockpits in the forward-most section of the booms in front of the lower wing and served as pilot and machine gunner.
Flight testing revealed sluggish performance and the aircraft was scrapped after a minor crash.