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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
| name=XP-4
| image= File:Boeing XP-4.jpg
| caption=Boeing XP-4 during trials
}}{{Infobox Aircraft Type
| type=fighter 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]] '''Boeing XP-4''' was a prototype United StatesAmerican [[biplane]] [[fighter aircraft|fighter]] of the 1920s. thatIt was grounded permanently after just 4.5 hours of flight testing.<ref name="Angel"/>
 
==Development and design==
Line 32:
 
==Specifications (XP-4) ==
{{Aircraft specs
{{aircraft specifications
|prime units?=kts
|plane or copter?=plane
|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
|length ft= 23
|capacity=
|length mainin= 23 ft 11 in
|length altm= 7.29 m
|span mainft= 32 ft 1 in
|span altin= 9.78 m1
|span m= 9.78
|height main= 8 ft 10 in▼
|height altft= 2.69 m8
▲|height mainin= 8 ft 10 in
|area main= 245 ft²▼
|areaheight altm= 222.869 m²
▲|wing area mainsqft= 245 ft²
|airfoil=
|emptywing weightarea mainsqm= 2,78322.8 lb
|empty weight altlb= 12,264783 kg
|loadedempty weight mainkg= 1,264
|loadedmax takeoff weight altlb= 3,650
|max takeoff weight altkg= 1,655 kg▼
|useful load main=
|engineeng1 (prop)name=[[Packard 1A-1500]]▼
|useful load alt=
|eng1 type of prop=supercharged liquid-cooled piston engine▼
|max takeoff weight main= 3,650 lb
|eng1 number=1
▲|max takeoff weight alt= 1,655 kg
|powereng1 mainhp= 510 hp▼
|more general=
|powereng1 altkw= 380 kW▼
 
|max speed mainkts=146 knots▼
▲|engine (prop)=[[Packard 1A-1500]]
|max speed altmph= 168 mph, 270 km/h▼
▲|type of prop=supercharged liquid-cooled piston engine
|max speed kmh= 270
|number of props=1
|cruise speed mainkts= 104 knots▼
▲|power main= 510 hp
|cruise speed altmph= 120 mph, 193 km/h▼
▲|power alt= 380 kW
|cruise speed kmh= 193
|power original=
|range mainnmi= 326 NM▼
|range altmiles= 375 mi, 604 km▼
|propeller or rotor?=<!-- options: propelller/rotor -->
|range km= 604
|propellers=
|ceiling mainft= 22,850 ft▼
|number of propellers per engine=
|ceiling altm= 6,965 m▼
|propeller diameter main=
|climb rate mainftmin= 1,400 ft/min▼
|propeller diameter alt=
|climb rate altms= 7.1 m/s▼
 
|guns= one 0.3 in and one 0.5 in [[machine gun]]s firing through propellorpropeller disc ''plus'' two wing mounted 0.3 in [[machine gunsgun]]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=
 
}}
 
Line 125 ⟶ 91:
===Bibliography===
{{Refbegin}}
* 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:80/museum/research/p4.htm USAF Museum page, with pictures]
 
{{Boeing military aircraft}}
{{Boeing model numbers}}
{{USAF fighters}}
 
[[Category:Single-engine1920s United States fighter aircraft|Boeing P-04]]
[[Category:UnitedBoeing States fightermilitary aircraft 1920–1929|Boeing P-04]]
[[Category:BoeingSingle-engined tractor aircraft|P-04]]
[[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"