title: Sikorsky S-4
text: # Sikorsky S-4
  
  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.
  
  ## Specifications
  
  Data from Russian Aviation Museum
  
  General characteristics
  
  * Crew: One
  * Length: 26 ft 3 in (8 m)
  * Upper wingspan: 29 ft 6 in (9 m)
  * Wing area: 300 sq ft (28 $m^2)$
  * Empty weight: 573 lb (260 kg)
  * Gross weight: 794 lb (360 kg)
  * Powerplant: 1 × Anzani 3 -cylinder air-cooled fan piston engine, 40 hp (30 kW)
  
  Performance
  
  