纳粹德国空军1944年开始的主力战机除了新是的Me 262之外就是Bf 109 K系列和Fw 190 D系列，而K-4和D-9则是其中的绝对主力。有关其历史，之前笔者已经写 ...

During its production run, the Bf 109 was also built by Erla ... Armed with two 13 mm machine guns atop the cowling and a 20 mm or 30 mm cannon that was mounted through a sealed tube between ...

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