page_title: Naval Aircraft Factory PN
section_title: Variants
hierarchical_section_title: Naval Aircraft Factory PN / Variants
caption_attribution_description: U.S. Navy Douglas PD-1 flying boats of patrol squadron VP-4D14 over Hawaii (USA), March 1930. "D14" designated the 14th Naval District.
context_page_description: The Naval Aircraft Factory PN was a series of open cockpit American flying boats of the 1920s and 1930s. A development of the Felixstowe F5L flying boat of the First World War, variants of the PN were built for the United States Navy by Douglas, Keystone Aircraft and Martin.
context_section_description: PN-5
  Redesignated Felixstowe F5L
  PN-6
  Redesignated F-6L. Last two Naval Aircraft Factory F5Ls, modified with revised tail surfaces.
  PN-7
  Modified version with new wings with high-lift thick aerofoil section and reduced wingspan (72 ft 10 in compared with 103 ft 9 in). Powered by two 525 hp (391 kW) Wright T-2 engines. Two built.
  PN-8
  PN-7 with metal hull. Powered by two 475 hp (354 kW) Packard 1A-2500 V-12 engines. Two built.
  PN-9
  Converted from PN-8 with redesigned engine nacelles. One converted.
  PN-10
  Similar to PN-8. Powered by two 500 hp (370 kW) Packard 1A-2500. Two built.
  PN-11
  New hull eliminating sponsons, fitted with twin vertical tail surfaces. Four built, one with two Pratt & Whitney R-1690 Hornet engines, and remaining three powered by two Wright R-1750D Cyclone.
  XP4N-1
  Improved PN-11; three aircraft ordered, originally designated XP2N but redesignated XP4N-1 before delivery. Last two aircraft completed as XP4N-2s.
  XP4N-2
  Improved XP4N-1 with additional fuel capacity.
  PN-12
  Development of PN-10 powered by radial engines. Two built. One powered by two Pratt & Whitney Hornet engines, with the other powered by two Wright R-1750 Cyclone engines.
  Douglas PD-1
  Developed production version of PN-12. Two 575 hp (429 kW) Wright R-1750 Cyclone engines. 25 built by Douglas.
  Keystone PK-1
  Production version of PN-12. Twin tails. Two 575 hp (429 kW) Wright R-1820 Cyclone engines. 18 built by Keystone.
  Martin PM-1
  Production derivative of PN-12. Two 525 hp (391 kW) Wright R-1750 Cyclone engines. 27 built for US Navy by Martin.
  Martin PM-1B
  Export version of PM-1 for Brazil. Three built.
  Martin PM-2
  Improved derivative of PM-1 with more powerful Wright R-1820 Cyclone engines and twin tails. 25 built.
caption: Douglas PD-1s of VP-4 over Hawaii, in 1930
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