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{{short description|Fighter aircraft prototype by Boeing}}
The [[Boeing]] '''XP-4''' was a prototype United States [[biplane]] [[fighter aircraft|fighter]] of the 1920s that was grounded permanently after just 4.5 hours of flight testing.
{|{{Infobox Aircraft Begin
|name=XP-4
|image= File:Boeing XP-4.jpg
|caption=Boeing XP-4 during trials
}}{{Infobox Aircraft Type
|type= Fighter
|national origin= United States
|manufacturer= [[Boeing]]
|designer=
|first flight=1927<ref name="Angel">Angelucci 1987, pp. 71–72.</ref>
|introduced=
|retired=
|status=
|primary user=
|number built=1
|developed from= [[Boeing Model 15]]
|variants with their own articles=
}}
|}


The '''Boeing XP-4''' was a prototype American [[biplane]] [[fighter aircraft|fighter]] of the 1920s. It was grounded permanently after just 4.5 hours of flight testing.<ref name="Angel"/>
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 [[Boeing Model 15|PW-9]]s, and the engine upgraded to a 510 hp [[Packard 1A-1500]]. This machine was designated XP-4.


==Development and design==
In addition, the basic PW-9 armament of one .50 and one .30 cal. [[machine gun]]s 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).
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 [[Boeing Model 15|PW-9]]s, and the engine upgraded to a 510&nbsp;hp [[Packard 1A-1500]]. This machine was designated XP-4.<ref name="Angel"/>

In addition, the basic PW-9 armament of one .50 and one .30 cal. [[machine gun]]s 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).<ref>Jones 1975, pp. 20–22.</ref>


All these modifications added weight, so the lower wing span was extended by 9.5 feet.
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 [[July 27]], [[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.
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&nbsp;lbs of extra weight, the craft performing more poorly than its predecessor, and the project was quickly abandoned.<ref name="Angel"/>


==Specifications (XP-4) ==
== References ==
{{Aircraft specs
|prime units?=kts
|ref= Fighters of the United States Air Force <ref name="USFightersp33-34">Dorr and Bishop 1990, pp. 33–34.</ref>


|crew=One
* Lloyd S. Jones, ''U.S. Fighters'' (Aero Publishers, Inc., 1975) pp. 20-22 ISBN 0-8168-9200-8
|length ft= 23
* [http://home.att.net/~jbaugher1/p4.html Joe Baugher page on the XP-4]
|length in= 11
* [http://www.wpafb.af.mil/museum/research/p4.htm USAF Museum page, with pictures]
|length m= 7.29
|span ft= 32
|span in= 1
|span m= 9.78
|height ft= 8
|height in= 10
|height m= 2.69
|wing area sqft= 245
|wing area sqm= 22.8
|empty weight lb= 2,783
|empty weight kg= 1,264
|max takeoff weight lb= 3,650
|max takeoff weight kg= 1,655
|eng1 name=[[Packard 1A-1500]]
|eng1 type=supercharged liquid-cooled piston engine
|eng1 number=1
|eng1 hp= 510
|eng1 kw= 380
|max speed kts=146
|max speed mph= 168
|max speed kmh= 270
|cruise speed kts= 104
|cruise speed mph= 120
|cruise speed kmh= 193
|range nmi= 326
|range miles= 375
|range km= 604
|ceiling ft= 22,850
|ceiling m= 6,965
|climb rate ftmin= 1,400
|climb rate ms= 7.1
|guns= one 0.3 in and one 0.5 in [[machine gun]]s firing through propeller disc ''plus'' two wing mounted 0.3 in [[machine gun]]s
}}


==See also==
{{aircontent
{{aircontent
|related=
|related=
Line 23: Line 82:
* [[List of military aircraft of the United States]]
* [[List of military aircraft of the United States]]
* [[List of fighter aircraft]]
* [[List of fighter aircraft]]

}}
}}
{{aviation lists}}


==References==
{{USAF fighters}}


===Notes===
{{aero-specs}}
{{Reflist}}


===Bibliography===
[[Category:United States fighter aircraft 1920-1929|P-04, Boeing]]
{{Refbegin}}
[[Category:Boeing aircraft|XP-4]]
* 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}}.
{{Refend}}

==External links==
* [http://www.joebaugher.com/usaf_fighters/p4.html Joe Baugher page on the XP-4]
* [https://web.archive.org/web/20060716165848/http://www.wpafb.af.mil/museum/research/p4.htm USAF Museum page, with pictures]

{{Boeing military aircraft}}
{{Boeing model numbers}}
{{USAF fighters}}


[[Category:1920s United States fighter aircraft|Boeing P-04]]
{{aero-pre1930s-stub}}
[[Category:Boeing military aircraft|P-04]]
[[Category:Single-engined tractor aircraft]]
[[Category:Biplanes]]

Latest revision as of 02:04, 13 May 2023

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 American biplane fighter of the 1920s. It was grounded permanently after just 4.5 hours of flight testing.[1]

Development and design[edit]

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)[edit]

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

General characteristics

  • Crew: One
  • Length: 23 ft 11 in (7.29 m)
  • Wingspan: 32 ft 1 in (9.78 m)
  • Height: 8 ft 10 in (2.69 m)
  • Wing area: 245 sq ft (22.8 m2)
  • Empty weight: 2,783 lb (1,264 kg)
  • Max takeoff weight: 3,650 lb (1,655 kg)
  • Powerplant: 1 × Packard 1A-1500 supercharged liquid-cooled piston engine, 510 hp (380 kW)

Performance

  • Maximum speed: 146 kn (168 mph, 270 km/h)
  • Cruise speed: 104 kn (120 mph, 193 km/h)
  • Range: 326 nmi (375 mi, 604 km)
  • Service ceiling: 22,850 ft (6,965 m)
  • Rate of climb: 1,400 ft/min (7.1 m/s)

Armament

See also[edit]

Related lists

References[edit]

Notes[edit]

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

Bibliography[edit]

  • 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[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Boeing_XP-4&oldid=1154523234"