Technical data
Type S-18
Function Interceptor ???
Year 1916
Crew 2
Engines 2*150hp 'Sunbeam'
Length 9.7m
Wingspan 16.5/15.3m
Wing area 58m2
Empty weight 1485kg
Loaded weight 2100kg
Wing Load (kg/m2) 36.2
Power load (kg/hp) 7.0
Armament
Guns 1*mg

S-18, I.I.Sikorsky

Drawing from "History of aircraft construction in the USSR", Vol.1 p.176

Large twin-engine biplane. Engines with pusher propellers were installed on the lower wing. Fuselage was covered with plywood.

Layout of a medium bomber, but intended as an interceptor. So gunner position was in the nose, and no rear defence were provided.

'Sunbeam' engines were a complete mess, and fully loaded aircraft failed to take off. Later it was flown successfully with four 80hp 'Gnome' in two tandems. As a result, aircraft came to service only in May 1917.



References:
  • "History of aircraft construction in the USSR", Vol.1 p.177;

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