In the early summer of 1940, with the I-26) established in production in the GAZ 115, Aleksandr Yakovlev‘s OKB initiated the redesign of the fighter for all-metal construction as the I-30 (Ya-30), and the first of two prototypes entered flight test in the spring of 1941 as the Yak-3. Powered by a Klimov M-105P 12-cylinder liquid-cooled Vee-type engine rated at 1,100 hp for take-off and fitted with a Ye-100 mechanically-driven supercharger developed by V A Dollezhal, the Yak-3 had a three-piece wing with dihedral on the outer panels only and possessed an exceptionally heavy armament by contemporary standards. The single engine-mounted 20-mm ShVAK cannon and twin synchronised 7,62-mm ShKAS machine guns of the Yak-1 were augmented by two wingmounted ShVAK cannon.