Polikarpov's lineage I-16 -> I-180 -> I-185 matches perfectly the criterium of the growing potential. The latter was produced even in a small series for front-line tests. The problem of Polikarpov's fighters was rather soviet voluntarism than any performance or technological issues. I-185 was undoubtedly the best soviet fighter in 1942-1943. Even in 1944-1945 it could outperform any other soviet fighter upon the condition of its further development.No other 1930's fighter can match that.