Sikorsky S-4


The Sikorsky S-4 was a Russian aircraft built by Igor Sikorsky using many components of the S-3 including the Anzani three-cylinder engine. Construction of the biplane began in late December 1910 and was completed early in the spring of 1911. The machine was never flown but did appear in a static display at an aeronautical exhibition at Kharkov in the spring of 1911. Sometime afterward it was disassembled.

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