Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Friedrichshafen FF.31 was a German lightweight two-seat floatplane of the 1910s produced by Flugzeugbau Friedrichshafen. The FF.31 was a biplane floatplane with a central nacelle and two open cockpits. The engine was mounted at the rear of the nacelle, driving with a pusher propeller. The twin open-frame tail booms extended aft from the wings to carry the tail unit. A version of the FF.31 with a fixed tailskid landing gear was designated the FF.37.

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