1936 developing the tools for war.
The Bf109 V3. The first armed prototype with two Rheinmetall MG17 7.92mm (.303) calibre machine guns. As the British were developing aircraft with 6 to 8 wing mounted machineguns, it was intended to mount a centrally mounted gun. But this idea was abandoned due to constant problems with this gun.
1937 Condor Legion Spain. Testing for war.
The Bf109B. The first Berthas were originally installed with a fixed wooden propeller, which was soon replaced by a adjustable propeller. As problems with the centrally mounted gun continued, most were armed with just two machine guns.
1938 Preparing for war.
The Bf109C. Due to limited room the between the automatic slats and the wheels wells, there was only room for one gun in each wing. The Cesar version was the first Bf109 to be equipped with these guns.
1939 Invasion of Poland.
The Bf109D. Roughly 235 Doras took part in the invasion of Poland. But these were soon replaced by the Emil. It had both MG17 machineguns in the nose and in the wings. It was the last Bf109 to be equipped with the Jumo210 engine.
The Bf109 V3. The first armed prototype with two Rheinmetall MG17 7.92mm (.303) calibre machine guns. As the British were developing aircraft with 6 to 8 wing mounted machineguns, it was intended to mount a centrally mounted gun. But this idea was abandoned due to constant problems with this gun.

1937 Condor Legion Spain. Testing for war.
The Bf109B. The first Berthas were originally installed with a fixed wooden propeller, which was soon replaced by a adjustable propeller. As problems with the centrally mounted gun continued, most were armed with just two machine guns.

1938 Preparing for war.
The Bf109C. Due to limited room the between the automatic slats and the wheels wells, there was only room for one gun in each wing. The Cesar version was the first Bf109 to be equipped with these guns.

1939 Invasion of Poland.
The Bf109D. Roughly 235 Doras took part in the invasion of Poland. But these were soon replaced by the Emil. It had both MG17 machineguns in the nose and in the wings. It was the last Bf109 to be equipped with the Jumo210 engine.

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