World Library  
Flag as Inappropriate
Email this Article

Boeing XP-4

Article Id: WHEBN0006164626
Reproduction Date:

Title: Boeing XP-4  
Author: World Heritage Encyclopedia
Language: English
Subject: Packard 1A-1500, Vultee XP-68 Tornado, Tucker XP-57, Boeing XP-9, Boeing XP-8
Publisher: World Heritage Encyclopedia

Boeing XP-4

Boeing XP-4 during trials
Role fighter
National origin United States
Manufacturer Boeing
First flight 1927[1]
Number built 1
Developed from Boeing Model 15

The Boeing XP-4 was a prototype United States biplane fighter of the 1920s that was grounded permanently after just 4.5 hours of flight testing.[1]


  • Development and design 1
  • Specifications (XP-4) 2
  • See also 3
  • References 4
    • Notes 4.1
    • Bibliography 4.2
  • External links 5

Development and design

In 1926, the United States Army was very interested in the turbo-supercharger as a way of improving engine performance, and requested that one be added to the last of the PW-9s, and the engine upgraded to a 510 hp Packard 1A-1500. This machine was designated XP-4.[1]

In addition, the basic PW-9 armament of one .50 and one .30 cal. machine guns in the nose was supplemented by two added .30 cal. guns mounted under the lower wing, far enough out to be outside the propeller arc (thus not needing synchronization).[2]

All these modifications added weight, so the lower wing span was extended by 9.5 feet.

The airplane was delivered to Wright Field for testing on 27 July 1927, but it quickly became apparent that the Packard engine did not have sufficient power to compensate for the 800 lbs of extra weight, the craft performing more poorly than its predecessor, and the project was quickly abandoned.[1]

Specifications (XP-4)

Data from Fighters of the United States Air Force [3]

General characteristics


  • Guns: one 0.3 in and one 0.5 in machine guns firing through propellor disc plus two wing mounted 0.3 in machine guns

See also

Related lists



  1. ^ a b c d Angelucci 1987, pp. 71–72.
  2. ^ Jones 1975, pp. 20–22.
  3. ^ Dorr and Bishop 1990, pp. 33–34.


  • Angelucci, Enzo. The American Fighter from 1917 to the present. New York: Orion Books, 1987. ISBN 0-517-56588-9.
  • Dorr, Robert F. and David Donald. Fighters of the United States Air Force. London: Temple, 1990. ISBN 0-600-55094-X.
  • Jones, Lloyd S. U.S. Fighters: Army-Air Force 1925 to 1980s.. Fallbrook, California: Aero Publishers, Inc., 1975. ISBN 0-8168-9200-8.

External links

  • Joe Baugher page on the XP-4
  • USAF Museum page, with pictures
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.