Stal-11 by A.I.Putilov

assenger/mail delivery aircraft, capable to perform reconnaissance missions in wartime. Low wing monoplane with retractable landing gear of very uncommon design. Both wing and fuselage had monocoque construction with stainless steel frame and 0.8 to 2.5mm thick plywood skin.Wing spars - light and elegant 3-D frames, with numerous weight saving holes. Plywood strips (~40mm wide) were attached to the frame via point-wielded short 'nails'. Then the skin was glued on those strips.
Material use in Stal-11
Stainless steel40%
Other steels 20%
Plywood 30%
Other materials10%
Surface quality was very good, whole construction was very light and rigid. Wing airfoil was developed at TsAGI by F.G.Glass. Flaps could be deployed at angles up to 600.
Aircraft was ready on Fall 1936. Extensive trials were carried out, in both civil and military configurations. Approximately 300 landings were performed.
No production followed. Looks like project was cancelled with arrest of leading designers.
  • "History of aircraft construction in the USSR" by V.B.Shavrov, Vol.1 p.562-563;
  • None found;
  • Technical data
    Type Stal-11
    Function Passenger
    Year 1936
    Crew 1
    Engines 1*860hp M-100A
    Length 12.5m
    Wingspan 15.0m
    Wing area 31.0m2
    Empty weight 1830kg
    Loaded weight 2700kg
    Wing load 87kg/m2
    Power load 3.1kg/hp
    Maximum Speed at 0m 430km/h
    Cruise Speed 370km/h
    Landing Speed 80km/h
    Ceiling 8000m
    Fuel 380kg
    Seats 4
    Cargo ?kg
    Created February 19, 1999
    by Alexandre Savine
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