Friedrichshafen FF.48

The Friedrichshafen FF.48 was a German two-seat floatplane fighter of the 1910s produced by Flugzeugbau Friedrichshafen.
Development and design.
The FF.48, along with the smaller single-seat FF.43, was designed for defence of the floatplane bases, it was a biplane powered by a Maybach Mb.IV inline piston engine. The pilot and observer each had control of one 7.92 mm (.312 in) machine gun. Only three aircraft were built.