Nicknamed "Gustav", the most important modification of bf-109 is divided into more than a dozen sub modifications. A total of 21600 units (23000 units) were produced and put into service in the summer of 1942. It is the type with the largest number of production. Bf-109g is refitted with a high-power db605a engine that can spray water for afterburner, so its performance is comprehensively improved, especially the firepower is strengthened. Among them, the engine power of bf-109g-5 is as high as 1800 HP, which is the highest among the modifications of bf-109. Bf-109g-1, - 3, - 5 are high altitude fighters with pressurized cockpit; G-2, - 4, - 6, - 10, - 14 are fighter bombers, which can be equipped with two 20 mm mg151 mechanism gun pods or two 210 mm anti bomber rocket launchers under the wing; G-8 is a combat reconnaissance aircraft with excellent cockpit vision; The g-12 is a two seat trainer