Initially, design was started on a single-seat fighter by Dmitry Pavlovich Grigorovich, to compete with the Polikarpov I-1 biplane.
1, at Khodinka, near Moscow, was a single-seat, single-bay biplane of wooden construction, with the forward portion of the fuselage being covered in plywood and the rear having fabric skinning.
In development, a major problem was that of engine cooling - various methods were tested including radiators attached to the undercarriage legs, but in the end a radiator suspended beneath the engine was used.
Data from The Complete Book of Fighters[1]General characteristics Performance Armament
Related development Aircraft of comparable role, configuration, and era