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{{short description|Fighter aircraft prototype by Boeing}}
<!-- This article is a part of [[Wikipedia:WikiProject Aircraft]]. Please see [[Wikipedia:WikiProject Aircraft/page content]] for recommended layout. -->
{|{{Infobox Aircraft Begin
{|{{Infobox Aircraft Begin
| name=XP-4
|name=XP-4
| image=File:Boeing XP-4.jpg
|image= File:Boeing XP-4.jpg
| caption=Boeing XP-4 during trials
|caption=Boeing XP-4 during trials
}}{{Infobox Aircraft Type
}}{{Infobox Aircraft Type
| type=fighter
|type= Fighter
| national origin=[[United States]]
|national origin= United States
| manufacturer=[[Boeing]]
|manufacturer= [[Boeing]]
| designer=
|designer=
| first flight=1927<ref name="Angel">Angelucci 1987, pp.71-72.</ref>
|first flight=1927<ref name="Angel">Angelucci 1987, pp. 71–72.</ref>
| introduced=
|introduced=
| retired=
|retired=
| status=
|status=
| primary user=
|primary user=
| number built=1
|number built=1
| developed from= [[Boeing Model 15]]
|developed from= [[Boeing Model 15]]
| variants with their own articles=
|variants with their own articles=
}}
}}
|}
|}


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.<ref name="Angel"/>
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"/>


==Development and design==
==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 [[Boeing Model 15|PW-9]]s, and the engine upgraded to a 510 hp [[Packard 1A-1500]]. This machine was designated XP-4.<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&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>
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>
Line 29: Line 29:
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 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.<ref name="Angel"/>
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) ==
==Specifications (XP-4) ==
{{Aircraft specs
{{aircraft specifications
|prime units?=kts
|plane or copter?=plane
|ref= Fighters of the United States Air Force <ref name="USFightersp33-34">Dorr and Bishop 1990, pp. 33–34.</ref>
|jet or prop?=prop

|ref= Fighters of the United States Air Force <ref name="USFightersp33-34">Dorr and Bishop 1990, pp. 33–34.</ref>


|crew=One
|crew=One
|length ft= 23
|capacity=
|length main= 23 ft 11 in
|length in= 11
|length alt= 7.29 m
|length m= 7.29
|span main= 32 ft 1 in
|span ft= 32
|span alt= 9.78 m
|span in= 1
|span m= 9.78
|height main= 8 ft 10 in
|height alt= 2.69 m
|height ft= 8
|height in= 10
|area main= 245 ft²
|area alt= 22.8 m²
|height m= 2.69
|wing area sqft= 245
|airfoil=
|empty weight main= 2,783 lb
|wing area sqm= 22.8
|empty weight alt= 1,264 kg
|empty weight lb= 2,783
|loaded weight main=
|empty weight kg= 1,264
|loaded weight alt=
|max takeoff weight lb= 3,650
|max takeoff weight kg= 1,655
|useful load main=
|eng1 name=[[Packard 1A-1500]]
|useful load alt=
|eng1 type=supercharged liquid-cooled piston engine
|max takeoff weight main= 3,650 lb
|eng1 number=1
|max takeoff weight alt= 1,655 kg
|eng1 hp= 510
|more general=
|eng1 kw= 380

|max speed kts=146
|engine (prop)=[[Packard 1A-1500]]
|max speed mph= 168
|type of prop=supercharged liquid cooled piston engine
|max speed kmh= 270
|number of props=1
|cruise speed kts= 104
|power main= 510 hp
|cruise speed mph= 120
|power alt= 380 kW
|cruise speed kmh= 193
|power original=
|range nmi= 326
|range miles= 375
|propeller or rotor?=<!-- options: propelller/rotor -->
|range km= 604
|propellers=
|ceiling ft= 22,850
|number of propellers per engine=
|ceiling m= 6,965
|propeller diameter main=
|climb rate ftmin= 1,400
|propeller diameter alt=
|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
|max speed main=146 knots
}}
|max speed alt= 168 mph, 270 km/h
|cruise speed main= 104 knots
|cruise speed alt= 120 mph, 193 km/h
|never exceed speed main= <!-- knots-->
|never exceed speed alt= <!--mph, km/h-->
|stall speed main= <!--knots-->
|stall speed alt= <!--mph, km/h-->
|range main= 326 NM
|range alt= 375 mi, 604 km
|ferry range main=
|ferry range alt=
|ferry range more=
|ceiling main= 22,850 ft
|ceiling alt= 6,965 m
|climb rate main= 1,400 ft/min
|climb rate alt= 7.1 m/s
|loading main= <!--lb/ft²-->
|loading alt= <!--kg/m²-->
|thrust/weight=<!-- a unitless ratio -->
|power/mass main= <!--hp/lb-->
|power/mass alt= <!--kW/kg-->
|more performance=

|guns= one 0.3 in and one 0.5 in [[machine gun]]s firing through propellor disc ''plus'' two wing mounted 0.3 in machine guns
|bombs=
|rockets=
|missiles=
|hardpoints=
|hardpoint capacity=

|avionics=

}}


==See also==
==See also==
Line 119: Line 85:


==References==
==References==
;Notes
{{reflist}}


===Notes===
;Bibliography
{{refbegin}}
{{Reflist}}

* Angelucci, Enzo. ''The American Fighter from 1917 to the present.'' New York: Orion Books, 1987. ISBN 0-517-56588-9.
===Bibliography===
* Dorr, Robert F. and David Donald. ''Fighters of the United States Air Force''. London: Temple, 1990. ISBN 0-600-55094-X.
{{Refbegin}}
* Jones, Lloyd S. ''U.S. Fighters: Army-Air Force 1925 to 1980s.''. Fallbrook, California: Aero Publishers, Inc., 1975. ISBN 0-8168-9200-8.
* Angelucci, Enzo. ''The American Fighter from 1917 to the present.'' New York: Orion Books, 1987. {{ISBN|0-517-56588-9}}.
{{refend}}
* 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==
==External links==
* [http://www.joebaugher.com/usaf_fighters/p4.html Joe Baugher page on the XP-4]
* [http://www.joebaugher.com/usaf_fighters/p4.html Joe Baugher page on the XP-4]
* [http://www.wpafb.af.mil/museum/research/p4.htm USAF Museum page, with pictures]
* [https://web.archive.org/web/20060716165848/http://www.wpafb.af.mil/museum/research/p4.htm USAF Museum page, with pictures]

{{aviation lists}}


{{Boeing military aircraft}}
{{Boeing model numbers}}
{{USAF fighters}}
{{USAF fighters}}
[[Category:Single-engine aircraft]]
[[Category:United States fighter aircraft 1920–1929|P-04, Boeing]]
[[Category:Boeing aircraft|P-04, Boeing]]


[[fr:Boeing XP-4]]
[[Category:1920s United States fighter aircraft|Boeing P-04]]
[[Category:Boeing military aircraft|P-04]]
[[ja:XP-4 (航空機)]]
[[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"