S-5/S-5A, I.I.Sikorsky

Igor Sikorsky's pilot license (dated August 18, 1911 old style). The photograph shows Sikorsky at the controls of his S-5. Courtesy of Carl J. Bobrow and the National Air and Space Museum;
32k b/w as seen at "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.1 p.73

A
fter the in-flight failure of Anzani engine (S-4 model) I.I.Sikorsky incorporated German built Argus engines, which was heavier but more reliable. Upper wing span was increased. second seat was added.
The S-5, first flown in April width="256" height="187" , was able for sustained flight up to an hour. Flying this plane I.I.Sikorsky obtained his pilots license and established four Russian records:
Few flights with passenger were performed on June 14, 1911.
The seaplane version S-5A had more powerful Gnome-Rhone engine.
The seaplane version S-5A had 60hp Gnome (Rhone) engine. It had very slim fuselage, but it was rugged enough due to plywood cover. First version had pair large ski-shaped float and small cylinder float under the tail.
Test flights by G.V.Alekhnovich proved that aircraft is underpowered and it was not accepted by Sea Department. Used later as a trainer.
36k b/w two-float S-5A hydroplane "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.1 p.134
Second version of S-5A seaplane had single large float, two small support floats under the wings and tail cylinder. 80hp Gnome provided more power, and aircraft proved to have better performance than 'Curtiss' and Farman-XVI. It was in active reconnaissance service in Revel (now Tallin) since September 1914.
32k b/w two-float S-5A hydroplane "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.1 p.134
Sources:
  • 'Igor Sikorsky - The Russian Years' by K.N.Finne
  • "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.1 p.73-74, 133-135;
  • Short article(?) by Carl J. Bobrow found at RAP by A. Gretchihine.
  • Technical data
    Type S-5 S-5A
    Function experimental seaplane
    Year 1911 1912
    Crew 1+1 ?
    Engines 50hp Argus 60hp/80hp Gnome-Rhone
    Empty Weight 320kg ?
    Maximum Weight 440kg ?
    Length 8.5m 8.0
    Wing Span 12.0/9.0m 12.0/8.5m
    Wing Area 33.0m2 32.2m2
    Speed 125km/h ?
    Ceiling 500m ?
    Range 85km ?
    Records of the Sikorsky S-5 (August 18, 1911)
    Ceiling 500m;
    Range 85km;
    Speed 125km/h;
    Endurance 52 min;
    Modified September 5, 1996
    by Alexandre Savine;
    Back to
    Main Gate