General Information
Type IS-4
Function Experimental Fighter
Year 1941
Crew 1
Powerplant (projected)
Type M-120
Power 1650hp
Powerplant (installed)
Type AM-37
Power 1400hp
Length ?m
Wingspan 8.6m
Wing area (biplane) 20.83m2
Wing area (monoplane) 13.0m2
Weights and loads
Empty kg
Loaded 2900kg
Wing load (takeoff) 139
Wing load (cruise) 223
Power load (kg/hp) 2.07
Speed (monoplane)
Maximum 720km/h
Speed (biplane)
Maximum 436km/h
Landing 107km/h
Practical ?km
Ceiling 12500m
Fuel ?kg
2*20mm ShVAK
2*12.7mm UBS

IS-4, V.V.Nikitin, V.V.Shevchenko

Drawings (24k) provided by Dean McGinnes

Drawing (40k) provided by Dean McGinnes shows two different designs of IS-4.

Development of the IS-2. Switching from radial to liquid cooling Vee engine (M-120), enclosed cockpit, very clean lines promised good results. Expected top speed was expected of 720km/h! Unfortunately, as often happens, the engine didn't materialize, therefore designers installed mass-built AM-37 engine. New aircraft carried also more powerful armament. Drawing shows two different designs of IS-4.One above is an original outline and one below was built and flown.

Drawings (36k) provided by Dean McGinnes

The IS-4 was apparently flown sometime late 1940 or early 1941, but the flight records were lost in the German invasion.

Additionally, even though Nitikin created up as much as he could of the airframe and related equipment of his experimental design bureau, no trace of the airplane survived the hurried evacuation.

As the press of events forced the Soviet aircraft industry to concentrate upon conventional designs which could be produced in greater numbers in a short period, and the fact that apparently the IS-4 had some rather unusual handling characteristics, further work was halted.


IS-3 IS-18
  • "History of aircraft construction in the USSR", Vol.2 p.103;
  • IS-4, Shevchenko-Nikitin

  • Created November 25, 1996
    Modified February 02, 2000
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