O.Thetford, P.Gray German Aircraft of the First World War (Putnam)

Friedrichshafen FF 63
   The only information to be found on this aircraft is that it was a copy of the Brandenburg W 29, although it would appear more true to say that the design was based on the Brandenburg, as it was far from an exact copy.

J.Herris German Seaplane Fighters of WWI (A Centennial Perspective on Great War Airplanes 2)

Friedrichshafen FF63

   Friedrichshafen, who manufactured more seaplanes than any other German company, produced a competitor to the Brandenburg monoplanes, the FF63. The engine was the 200 hp Benz Bz.IV; virtually no other technical data on the type survives, and even its Marine Number is not known.
   The FF63 was not as innovative in its structural design as the Brandenburg monoplanes and only a single FF63 was built. The radiator above the engine was surely fitted to expedite early flight testing; this installation produced far too much drag for a production aircraft and also obstructed vision.

J.Herris Friedrichshafen Aircraft of WWI (A Centennial Perspective on Great War Airplanes 21)

Friedrichshafen FF63

   Friedrichshafen produced a competitor to the Brandenburg W.29, the FF63. The engine was the 200 hp Benz Bz.IV; virtually no other technical data on the type survives, and even its Marine Number is not known. The FF63 was not as innovative in its structural design as the Brandenburg monoplanes and only a single FF63 was built. The radiator above the engine was surely fitted to expedite early flight testing; this installation obstructed vision and produced far too much drag for a production aircraft.

Friedrichshafen FF63 Specifications
Engine: 200 hp Benz Bz.IV