The Friedrichshafen FF.53 was a German torpedo-carrying biplane floatplane of the 1910s produced by Flugzeugbau Friedrichshafen. Development and design The FF.53 was a twin-engined biplane floatplane, designed to carry a torpedo and powered by two Mercedes D.IVa engines. It was a development of the Friedrichshafen G.III heavy bomber. Only three aircraft were built. Specifications (FF.53) See also References Bibliography Further reading 1910s German bomber aircraft Floatplanes FF.53 Biplanes Twin piston-engined tractor aircraft Aircraft first flown in 1918