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 | | By the mid-1930s, the U.S. Army Air Corps (USAAC), superseded by the U.S. Army Air Forces (USAAF) on 20 June 1941, was ordering all-metal, single-engine, monoplane attack and pursuit aircraft with enclosed cockpits to replace the fabric-covered, open cockpit biplanes of the 1920s. |
 | | For the first time, USAAC and USN aircraft could be built with standardized equipment, e.g., engines, propellers, communications equipment, pressure pumps, pipe fittings, nuts, bolts, etc. This became the Army-Navy (AN) standard. |
 | | This aircraft was the first in the series to be equipped with the standardized 600 hp (447 kW) Pratt and Whitney R-1340-AN-1 radial engine used in all later models, a Hamilton Standard two-bladed constant-speed propeller, removable fuel tanks in the wing center section, a triangular shaped vertical fin and rudder, and blunt wingtips. |
| www.microworks.net /pacific/aviation/snj.htm (2137 words) |
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