Boeing XP-4: Difference between revisions
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{{short description|Fighter aircraft prototype by Boeing}} |
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{|{{Infobox Aircraft Begin |
{|{{Infobox Aircraft Begin |
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|name=XP-4 |
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|image= File:Boeing XP-4.jpg |
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|caption=Boeing XP-4 during trials |
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}}{{Infobox Aircraft Type |
}}{{Infobox Aircraft Type |
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|type= Fighter |
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|national origin= United States |
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|manufacturer= [[Boeing]] |
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|designer= |
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|first flight=1927<ref name="Angel">Angelucci 1987, pp. 71–72.</ref> |
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|introduced= |
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|retired= |
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|status= |
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|primary user= |
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|number built=1 |
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|developed from= [[Boeing Model 15]] |
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|variants with their own articles= |
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The |
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"/> |
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==Development and design== |
==Development and design== |
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==Specifications (XP-4) == |
==Specifications (XP-4) == |
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{{Aircraft specs |
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{{aircraft specifications |
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|prime units?=kts |
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|plane or copter?=plane |
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|jet or prop?=prop |
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|ref= Fighters of the United States Air Force <ref name="USFightersp33-34">Dorr and Bishop 1990, pp. 33–34.</ref> |
|ref= Fighters of the United States Air Force <ref name="USFightersp33-34">Dorr and Bishop 1990, pp. 33–34.</ref> |
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|crew=One |
|crew=One |
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|length ft= 23 |
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|capacity= |
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|length |
|length in= 11 |
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|length |
|length m= 7.29 |
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|span |
|span ft= 32 |
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|span |
|span in= 1 |
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|span m= 9.78 |
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|height |
|height ft= 8 |
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|height m= 2.69 |
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|airfoil= |
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|wing area sqm= 22.8 |
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|empty weight |
|empty weight lb= 2,783 |
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|empty weight kg= 1,264 |
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|max takeoff weight lb= 3,650 |
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|useful load main= |
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|useful load alt= |
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|max takeoff weight main= 3,650 lb |
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|eng1 number=1 |
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|more general= |
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|max speed kmh= 270 |
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|number of props=1 |
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|cruise speed kmh= 193 |
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|power original= |
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|propeller or rotor?=<!-- options: propelller/rotor --> |
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|range km= 604 |
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|propellers= |
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|number of propellers per engine= |
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|propeller diameter main= |
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|propeller diameter alt= |
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|never exceed speed main= <!-- knots--> |
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|never exceed speed alt= <!--mph, km/h--> |
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|stall speed main= <!--knots--> |
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|stall speed alt= <!--mph, km/h--> |
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|ferry range main= |
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|ferry range alt= |
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|ferry range more= |
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|loading main= <!--lb/ft²--> |
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|loading alt= <!--kg/m²--> |
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|thrust/weight=<!-- a unitless ratio --> |
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|power/mass main= <!--hp/lb--> |
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|power/mass alt= <!--kW/kg--> |
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|more performance= |
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|bombs= |
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|rockets= |
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|missiles= |
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|hardpoints= |
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|hardpoint capacity= |
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|avionics= |
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===Bibliography=== |
===Bibliography=== |
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{{Refbegin}} |
{{Refbegin}} |
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* Angelucci, Enzo. ''The American Fighter from 1917 to the present.'' New York: Orion Books, 1987. ISBN |
* Angelucci, Enzo. ''The American Fighter from 1917 to the present.'' New York: Orion Books, 1987. {{ISBN|0-517-56588-9}}. |
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* Dorr, Robert F. and David Donald. ''Fighters of the United States Air Force''. London: Temple, 1990. ISBN |
* Dorr, Robert F. and David Donald. ''Fighters of the United States Air Force''. London: Temple, 1990. {{ISBN|0-600-55094-X}}. |
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* Jones, Lloyd S. ''U.S. Fighters: Army-Air Force 1925 to 1980s.''. Fallbrook, California: Aero Publishers, Inc., 1975. ISBN |
* Jones, Lloyd S. ''U.S. Fighters: Army-Air Force 1925 to 1980s.''. Fallbrook, California: Aero Publishers, Inc., 1975. {{ISBN|0-8168-9200-8}}. |
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{{Refend}} |
{{Refend}} |
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==External links== |
==External links== |
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* [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] |
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* [https://web.archive.org/web/20060716165848/http://www.wpafb.af.mil |
* [https://web.archive.org/web/20060716165848/http://www.wpafb.af.mil/museum/research/p4.htm USAF Museum page, with pictures] |
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{{Boeing military aircraft}} |
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{{Boeing model numbers}} |
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{{USAF fighters}} |
{{USAF fighters}} |
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[[Category: |
[[Category:1920s United States fighter aircraft|Boeing P-04]] |
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[[Category: |
[[Category:Boeing military aircraft|P-04]] |
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[[Category: |
[[Category:Single-engined tractor aircraft]] |
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[[Category:Biplanes]] |
Latest revision as of 02:04, 13 May 2023
XP-4 | |
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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
- Guns: one 0.3 in and one 0.5 in machine guns firing through propeller disc plus two wing mounted 0.3 in machine guns
See also[edit]
Related lists
References[edit]
Notes[edit]
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.