: the bf109g series, or gustav", was introduced in mid-1942; its initial variants (g-1 through g-4) differed only in minor details from the bf 109f, most notably in being powered by the more powerful 1475hp db 605 engine. Odd numbered variants were built with a pressurised cockpit and gm-1 boost as high altitude fighters, while even numbered variants were non-pressurized air superiority fighters and fighter bombers. Long-range photo-reconnaissance variants also existed. The later g series (g-5 through g-14) was produced in a multitude of variants. By early 1944 tactical requirements resulted in the addition of mw-50 water injection boost and high performance superchargers, boosting engine output to 1,800-2,000hp.

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