Technical data
Type S-9 'Kruglyj'
Function Experimental
Year 1913
Crew 3
Engines 1*100hp Gnome Monosaupape
Wing Span 12.0m
Wing Area 30.0m2
Empty weight 690kg
Loaded weight 990kg
Wing Load (kg/m2) 33
Power load (kg/hp) 10
Maximum Speed less than 100km/h

S-9 'Kruglyj' (The Rounded One), I.I.Sikorsky

(48k b/w)"History of aircraft construction in the USSR", Vol.1 p.92;

First monocoque monoplane built in Russia. Plywood skin thickness was 5mm on nose section and 3mm on the tail. Rectangular wings had aerodynamically clean joints with fuselage. Despite advanced design, aircraft was overweight and almost all dimensions were larger than in the project. In addition the engine provided only 80% of its nominal power. All this resulted in quite poor performance, and after few test flights S-9 was abandoned.

  • "History of aircraft construction in the USSR", Vol.1 p.94;

  • Modified September 2, 1997 Back to
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