WWII Soviet Fighter-Biplane (winter version) The improved version of I-15 fighter was the I-15bis. Its main differences werenormal wing centre section and NACA type engine cowling. Serial production of I-15bis began in 1937 and continued to 1939.
WWII Soviet Fighter-Biplane (winter version) The improved version of I-15 fighter was the I-15bis. Its main differences werenormal wing centre section and NACA type engine cowling. Serial production of I-15bis began in 1937 and continued to 1939.
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