Technical data
Type Igrado 3B/M
Function Experimental
Year 1931
Crew 2
Engines 60hp 'Walter'
Length 5.4m
Height ?m
Wingspan 10.2m
Wing area 22.4m2
Empty weight 500kg
Loaded weight 675kg
Wing Load (kg/m2) 30.7
Power load (kg/hp) 11.3
Max. Speed at 0m 120km/h
Cruise Speed 92km/h

Igrado 3B/M by I.N.Vinogradov

Interesting effort to built 'modular' biplane aircraft. First, removing of the upper wing provided pilot with a monoplane. Front section of fuselage (all-aluminum) could serve as an airsled (when installed on skis) or as a boat (on floats). Tail section had a braced wooden frame and plywood skin. Wings - wood with fabric skin, struts - steel and aluminum tubes.

Aircraft was built in 1929- 1930 at aviaclub of the Frunze Factory School (professional college). Flown by designer himself in 1931 and found underpowered even in the biplane configuration. More powerful engine installation was planned, but after hard landing accident 'Igrado' was abandoned.

Ivan Nikolaevich Vinogradov was a veteran-pilot of WWI, one of elders of Russian/Soviet aviation.

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  • "History of aircraft construction in the USSR", Vol.1 p.426;
  • ....
  • Created July 29, 1999 Back to
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