Friedrichshafen FF.11 explained

The Friedrichshafen FF.11 was a flying boat built in Germany in the early 1910s.

Bibliography

• Book: Herris . Jack . Friedrichshafen Aircraft of WWI: A Centennial Perspective on Great War Airplanes . 2016 . Aeronaut Books . Charleston, South Carolina . 978-1-935881-35-3. Great War Aviation Centennial Series. 21.