When was the American single-engined, single-seat, all-metal fighter and ground-attack aircraft first flew in which design Donovan Reese Berlin was associated?
Don R. Berlin Donovan Reese Berlin (June 13, 1898 – May 17, 1982) was an American military aircraft designer and aircraft industry executive. Among the many designs with which he is associated, are the Curtiss P-36 Hawk, Curtiss P-40 Warhawk and Fisher P-75 Eagle. His name is "synonymous with the development of military aviation". He designed aircraft that were safe, rugged and "a pilot's joy."
Fokker F.25 The Fokker F.25 Promotor, first flown in 1946, was a single-engined, twin-boomed, four-passenger monoplane with a pusher engine mounted at the rear of a central nacelle. It was of wooden construction and has fitted with a retractable nosewheel undercarriage. One feature of the design was that instead of a 2 + 2 seating, the pilot sat in front to the left, and all three passengers were on a bench seat to the rear of him. Alternatively, when being used as an air ambulance aircraft, it could carry a patient on a stretcher, which was loaded through a hatch in the aircraft's nose. The F.25 was evocative of the pre-war G.I design. The F.25 was based upon the design of the Difoga 421 aircraft, home-built and -designed secretly during World War II by Frits Diepen, a Ford garage owner from Tilburg, the Netherlands. His intention was to escape from German-occupied Europe to Britain using this aircraft that was powered by a Ford V-8.