| 词条 | Boeing XP-9 | ||||||||||||||||
| 释义 |
The Boeing XP-9 (company Model 96) was the first monoplane fighter aircraft produced by the United States aircraft manufacturing company Boeing. It incorporated sophisticated structural refinements that were influential in later Boeing designs. The sole prototype exhibited unsatisfactory characteristics with its lack of pilot visibility directly leading to its cancellation.[1] Design and developmentThe XP-9 was designed in 1928 to meet the requirements of a US Army request for a monoplane fighter. Its primary contribution to aircraft design was its semi-monocoque construction, which would become a standard for future aircraft. Boeing employed the structural features of the XP-9 into their contemporary P-12 biplane fighter when the P-12E variant incorporated a semi-monocoque metal fuselage structure similar to that of the XP-9. The undercarriage arrangement of the P-12C had also been first tried out on the XP-9 and then transferred into the production model.[2] Operational historyThe prototype XP-9, marked A 028-386, was first flown on 18 November 1930. It had impressive stats on the specification sheet, but it quickly became apparent that its large (6 ft chord) wing, which was placed atop the fuselage directly in front of the pilot, obstructed downward visibility so badly that simple landing maneuvers were hazardous.[2] Test pilots at the Army Test Centre at Wright Field found that the XP-9's inherent instability was so severe that immediate modifications were requested to increase the size of the vertical tail.[3] An enlarged vertical tail surface with smooth metal skinning was introduced, but failed to effect any significant improvement, and this revised XP-9 was grounded for instructional airframe use in August 1931, after only 15 hours of test flying.[4] Variants
Operators (planned)
Specifications (Boeing XP-9){{aircraft specifications|ref="The Complete Encyclopedia of World Aircraft" [5] |plane or copter?=plane |jet or prop?=prop |crew=1 |capacity= |length main= 25 ft 1.75 in |length alt= 7.66 m |span main= 36 ft 6 in |span alt= 11.13 m |height main= 7 ft 10.25 in |height alt= 3 m |area main= 210 ft2 |area alt= 19.51 m2 |airfoil= |empty weight main= 2,669 lb |empty weight alt= 1,211 kg |loaded weight main= |loaded weight alt= |useful load main= |useful load alt= |max takeoff weight main= 3,623 lb |max takeoff weight alt= 1,643 kg |more general= |engine (jet)= |type of jet= |number of jets= |thrust main= |thrust alt= |thrust original= |afterburning thrust main= |afterburning thrust alt= |engine (prop)= 1 |type of prop=Curtiss SV-1570-15 Conqueror |number of props= |power main= 600 hp |power alt= 448 kW |power original= |max speed main= 185 knots |max speed alt= 213 mph, 343 km/h |cruise speed main= 156.4 knots |cruise speed alt= 180 mph, 290 km/h |never exceed speed main= |never exceed speed alt= |stall speed main= |stall speed alt= |range main= 369 nautical miles |range alt= 425 mi, 684 km |ceiling main= 26,800 ft |ceiling alt= 8,170 m |climb rate main= 1,560 ft/min |climb rate alt= 7.9 m/s |loading main= |loading alt= |thrust/weight= |power/mass main= |power/mass alt= |more performance= |armament=2 machineguns, one .30 (7.62mm) and one .50 (12.7mm), 125 lbs bombs. |avionics= }} See also{{aircontent|related= |similar aircraft= |lists=
}} ReferencesNotes1. ^Yenne, Bill. World's Worst Aircraft. Greenwich, CT: Dorset Press, 1990. {{ISBN|0-88029-490-6}} 2. ^1 Pedigree of Champions: Boeing Since 1916 1969 3. ^Baugher, Joe. Boeing XP-9. 6 June 1998. {{cite web |url=http://home.att.net/~jbaugher1/p9.html |title=Archived copy |accessdate=2007-03-17 |deadurl=yes |archiveurl=https://web.archive.org/web/20051227024148/http://home.att.net/~jbaugher1/p9.html |archivedate=2005-12-27 |df= }} Access date: 17 March 2007. 4. ^1 Eden and Moeng 2002, p. 74-77. 5. ^Eden and Moeng 2002, p. 321. Bibliography{{refbegin}}
External links{{commons category|Boeing XP-9}}
4 : United States fighter aircraft 1930–1939|Boeing military aircraft|Single-engined tractor aircraft|High-wing aircraft |
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