Boeing XP-9


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Boeing XP-9

In May 1928, the USAAC issued a single-seat fighter specification to which Boeing responded with a shoulder-wing all-metal monoplane, the Model 96, which was assigned the official designation XP-9. Low development priority and production problems delayed the planned delivery date of the XP-9 from April 1929 until September 1930, the aircraft eventually flying for the first time on 18 November of that year. Powered by a Curtiss V-1570-15 liquid-cooled engine rated at 600hp, but actually delivering 583hp, the XP-9 featured a semi-monocoque fuselage of sheet Dural over metal formers. Performance proved disappointing, the poor vision from the rear-positioned cockpit and the unpleasant handling characteristics resulting in the test pilot referring to the XP-9 as "a menace". After initial tests, the original vertical tail surfaces were replaced by larger P-12 surfaces, but little improvement resulted and the USAAC did not exercise its option on five Y1P-9s.

Boeing XP-9

  Take-off weight1643 kg3622 lb
  Empty weight1210 kg2668 lb
  Wingspan11.13 m37 ft 6 in
  Length7.66 m25 ft 2 in
  Height2.36 m8 ft 9 in
  Max. speed343 km/h213 mph

Boeing XP-9A three-view drawing (1280 x 840)

Morgan Kennedy, e-mail, 10.12.2023 08:29

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Graham Clayton, e-mail, 13.02.2021 02:32

Landing and taking off would have been interesting with the lack of forward vision.


William Bruns, e-mail, 14.12.2011 07:25

As a retired Boeing Customer Quality Manager I am always interested in the airplanes in the Boeing archives and thier history. I have never seen this one before until an article in my Flight Journal magazine, February 2012 issue, page 11 showed it and a website to view and download the plans. I have yet to fine the plans but am still looking. If they are available on the internet someplace I would love to see them. After 33 years with Boeing i am still an airplane nut.


Jack Derrickson, e-mail, 06.02.2024 William Bruns

Did you ever find the plans for the XP-9?


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