Sikorsky S-4

S-4
S-4 displayed at an exhibition in Kharkov in the spring of 1911
Role Experimental
National origin Russian Empire
Designer Igor Sikorsky
Introduction 1911
Number built 1
Developed from Sikorsky S-3

The Sikorsky S-4 was a Russian aircraft built by Igor Sikorsky using many components of the S-3 including the 40 hp (30 kW) Anzani three-cylinder engine. Construction of the biplane began in late December 1910 and was completed early in the spring of 1911. The machine appeared in a static display at an aeronautical exhibition at Kharkov in the spring of 1911, but was never flown. Some time afterward it was disassembled.

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