The upper wing of I-15bis fighter in comparison with I-15 had straight lines (without - "Seagull" - "Chayka").
On the I-15 was improved nose-over of a motor and was strengthened a plane.
The I-15bis was equipped with more high-power and high-altitude motor M-25V and had stronger armament.
On fighter I-15bis the Soviet pilots - volunteers battled in the sky of Spain, China and Mongolia. The airplane was applied and in an initial stage of World War II.
Were built 2408 fighters I-15bis (1938-1939)