Polikarpov in February 1943, began preliminary design of two updated versions of the I-185.. The I-187 had a M-71F engine of 2200 hp, a bubble canopy, four 20 mm cannons, eight RS-82 rockets and an estimated maximum speed of 710 km/h. The I-188 used an improved M-90 engine with 2080 hp and used the same armament as the I-187. (Artist's view).