page_title: Felixstowe F5L
section_title: Design and development
hierarchical_section_title: Felixstowe F5L / Design and development
context_page_description: The twin-engine F5L was one of the Felixstowe F series of flying boats developed by John Cyril Porte at the Seaplane Experimental Station, Felixstowe, England, during the First World War for production in America.
  A civilian version of the aircraft was known as the Aeromarine 75.
context_section_description: Porte had taken the Curtiss H-12, an original design by the American Glenn Curtiss, and developed it into a practical series of flying boats at the Felixstowe station.  They then took their F.5 model and further redesigned it with better streamlining, a stronger hull using veneer instead of doped linen and U.S.-built 330 hp (later 400 hp) Liberty 12A engines. The prototype was built and tested in England and the design then taken over by the Naval Aircraft Factory, Philadelphia, where further modifications were made to suit their production methods under wartime conditions. The American-built version was also known as the Curtiss F5L and (in civilian operation) as the Aeromarine 75.
  The F5L was built by the Naval Aircraft Factory (137), Curtiss (60) and Canadian Aeroplanes Limited (30). Some were converted for civilian use by the Aeromarine Plane and Motor Company in 1919.
caption: The first Naval Aircraft Factory F5L, 24 July 1918.[1]
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