During the spring and summer of 1942 the assembly lines began to switch to the production of the Bf 109 G-series. With the introduction of the Bf 109 G-series the constant operational demands for increased fire power and additional equipment brought with them a serious deterioration in the fighter's flying characteristics. The most important change denoted by the introduction of the Bf 109 G was the installation of the more powerful Daimler Benz DB 605 A engine in which the cylinder block had been re-designed to obtain the maximum possible bore with the existing cylinder centers.Bf109 G-2 was produced in parallel with the Bf109 G-1, and differed in lacking the pressure cabin and GM-1 nitrous oxide boost. It was used primarily in the fighter reconnaissance role, and the service test group at Guyana court, France, experimented with a ventral gun pack in which two rear-firing MG 17 machine guns were fitted (Schraege Musik). The Bf-109G-2 was built in substantially larger numbers than the Bf-109G-1, and was produced in a wide range of modifications.
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