S-12, I.I.Sikorsky

(44k b/w) At the front airfield about 1915. The two pilots at the left are dressed in the typical flight suits of the Imperial Russian Air Force. The presence of the binoculars and map suggest the reconnaissance role played by most single-engine aircraft at the beginning af the World War I.
Courtesy of Carl J. Bobrow and Sergej Sikorsky;

L
ight development of the S-11, proposed by pilot G.V.Yankovsky (first on the left). It was the first aircraft of original Russian design to perform Nesterov Loop (G.V.Yankovsky). The same pilot set Russian altitude record in 1913, 3680m.
Stars may be seen on the fuselage and underwing. 32k photo from "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.1 p.96;
Aircraft appears to be a success, built in small series (10-12 built) and was in service through the Civil War until 1922.
Sources:
  • "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.1 p.96-97;
  • 'Igor Sikorsky - The Russian Years' by K.N.Finne
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  • S-12, Sikorsky
  • Technical data
    Type S-12
    Function Fighter
    Recce
    Year 1913
    Crew 2
    Engines 1*80hp Rhone, later Gnome
    Wing Area 19.7m2
    Empty Weight 419kg
    Loaded Weight 681kg
    Wing load 34.5kg/m2
    Power load 8.5kg/hp
    Ceiling 3680m
    Modified September 24, 1997
    by Alexandre Savine;
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