Martin PM

The Martin PM was a twin-engine biplane flying boat that the Glenn L. Martin Company built for the United States Navy at the end of the 1920s as a production derivative of the Naval Aircraft Factory PN-12, itself a descendant of the Felixstowe F5L of the First World War. Because the Naval Aircraft Factory could not build enough boats, the Navy contracted production out, and Martin received the PM-1, with two 525 horsepower Wright R-1750 Cyclone engines, of which 27 were built for the Navy, and the PM-2, which had more powerful Wright R-1820 Cyclone engines and twin tails; 25 were built. Both had an enclosed cockpit. Three export PM-1B aircraft went to Brazil, where the Navy called the type P1M and used PM-1s in bombing raids during the 1932 revolution.