One of the first monoplane fighter aircraft with retractable landing gear was the I-16, developed in the N.N. Polikarpov Design Bureau.
The maiden flight was in December 30, 1934 Type 24 modification with M-63 engine and reinforced chassis was in production in 1939-1940. It were produced 934 I-16 type 24.
In the summer of 1941 I-16 fighters were the basis of Soviet Fighter Aviation. They participated in air battles in all sectors of the Soviet-German Front. I-16 fighters were used in combat until mid 1943.
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