 Hansa-Brandenburg W.12

The Hansa-Brandenburg W.12 was a German biplane fighter floatplane of World War I.It was a development of Ernst Heinkel's previous KDW, adding a rear cockpit for an observer/gunner, and had an unusual inverted tailfin/rudder (which instead of standing up from the fuselage, hung below it) in order to give an uninterrupted field of fire.