IS-1 (Nikitin-Shevchenko) -
The IS-1 was a compromise between biplane and monoplane fighters: it was both.
The lower wing could be retracted upwards, flush with the forward fuselage and
the upper wing, while the wheels retracted into the lower wing surfaces. Only
experimental. Next version: IS-2. One 1100hp Shvetsov M-63 (Ash-63). 1940.
IS-2/I-220 (Nikitin-Shevchenko, don't confuse with MiG/I-220!) -
Development of the IS-1. The IS-2 had a smaller-diameter engine and generally
cleaned up lines. It did not enter production, because of concerns about the
complexity and vulnerability of the wing retraction mechanism.
One 1150hp Tumansky M-88. One built. 1941.
IS-4 (Nikitin-Shevchenko) -
Development of the IS-2. Projected, but not built. Expected top speed with a
1215kW M-120 engine was expected of 720km/h !
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