Bell XP-83

The early jet fighters consumed fuel at a prodigious rate which severely limited their range and endurance. In March 1944, the United States Army Air Forces requested Bell to design a fighter with increased endurance and formally awarded a contract for two prototypes on 31 July 1944.

Bell had been working on its "Model 40" interceptor design since 1943. It was redesigned as a long-range escort fighter while retaining the general layout of the P-59 Airacomet. The two General Electric J33-GE-5 turbojet engines were located in each wing root which left the large and bulky fuselage free for fuel tanks and armament. The fuselage was an all-metal semimonocoque capable of carrying 1,150 gal (4,350 L) of fuel. In addition, two 250 gal (950 L) drop tanks could be carried. The cabin was pressurized and used a small and low bubble style canopy. The armament was to be six 0.5 in (12.7 mm) machine guns in the nose.

Early wind tunnel reports had pinpointed directional instability but the "fix" of a larger tail would not be ready in time for flight testing.Koehnen 1982, p. 24.

The first prototype was flown on 25 February 1945, by Bell's chief test pilot, Jack Woolams. He found it to have satisfactory flight characteristics, although it was under-powered. The expected instability was confirmed – spins were avoided (until a larger tail fin was installed). The second prototype did incorporate a modified tail and an aileron boost system.Koehnen 1982, pp. 44, 48. One unusual characteristic was extremely high landing speeds, due to factors including the XP-83's lack of drag brakes – in addition to the sleek aerodynamics and relatively high minimum thrust settings common to early jet aircraft, and necessary to prevent unintended flame-outs. This meant that test pilots were forced to fly "stabilized approaches" (i.e. very long and flat landing approaches).Koehnen 1982, p. 48.

The first prototype was used in 1946 as a ramjet test-bed with an engineer's station located in the fuselage behind the pilot. On 14 September 1946, one of the ramjets caught fire forcing pilot, "Slick" Goodlin and engineer Charles Fay, to bail out. The second prototype flew on 19 October and was later scrapped in 1947. Apart from range, the XP-83 was inferior to the Lockheed P-80 Shooting Star and this led to the cancellation of the XP-83 project in 1947.

File:Bell XP-83 drawing.jpg

{{Aircraft specs

|ref=War Planes of the Second World WarGreen 1961, p. 24.

|prime units?=imp

|crew=1 (engineer's station fitted to first prototype, with an entrance door under the fuselage)

|length ft=44

|length in=10

|length note=

|span ft=53

|span in=0

|span note=

|height ft=15

|height in=3

|height note=

|wing area sqft=431

|wing area note=

|aspect ratio=

|airfoil=

|empty weight lb=14105

|empty weight note=

|gross weight lb=24090

|gross weight note=

|max takeoff weight lb=27500

|max takeoff weight note=

|fuel capacity={{cvt|1154|USgal|impgal l}} + 2x {{cvt|300|USgal|impgal l}} drop tanks

|more general=

|eng1 number=2

|eng1 name= General Electric XJ33-GE-5

|eng1 type=centrifugal-flow compressor turbojet engines

|eng1 hp=

|eng1 shp=

|eng1 lbf=4000

|eng1 note=for take-off at 11,500 rpm

|max speed mph=522

|max speed note=at {{cvt|15660|ft}}

|max speed mach=

|cruise speed mph=

|cruise speed note=

|stall speed mph=

|stall speed note=

|never exceed speed mph=

|never exceed speed note=

|minimum control speed mph=

|minimum control speed note=

|range miles=1730

|range note=on internals

|combat range miles=

|combat range note=

|ferry range miles=2050

|ferry range note=with drop tanks

|endurance=

|ceiling ft=45000

|ceiling note=

|g limits=

|roll rate=

|glide ratio=

|climb rate ftmin=5650

|climb rate note=

|time to altitude= {{cvt|30000|ft}} in 11 minutes 30 seconds

|sink rate ftmin=

|sink rate note=

|lift to drag=

|wing loading lb/sqft=56

|wing loading note=

|fuel consumption lb/mi=

|thrust/weight=0.33

|more performance=

|guns=

• 6 × .50 in (12.7 mm) M2 machine guns or
• 6 × .60 in (15.2 mm) T17E3 machine guns (prototypes) or
• 4 × 20 mm (0.79 in) Hispano cannons or
• 1 × 37 mm (1.46 in) cannon in the nose

|bombs= 2 × {{cvt|1000|lb|0}} bombs

|rockets=

|missiles=

|hardpoints=

|hardpoint capacity=

|hardpoint rockets=

|hardpoint missiles=

|hardpoint bombs=

|hardpoint other=2 × {{cvt|300|USgal|impgal l|1}} / {{cvt|l774|kg|1}} drop tanks

|avionics=

}}

{{Aircontent

|related=

• Bell P-59 Airacomet

|similar aircraft=

|lists=

• List of fighter aircraft
• List of military aircraft of the United States

}}

{{reflist}}

• Carpenter, David M. Flame Powered: The Bell XP-59A Airacomet and the General Electric I-A Engine. Boston: Jet Pioneers of America, 1982. {{ISBN|0-9633387-0-6}}. (Page 59 is about the XP-83.)
• Green, William. War Planes of the Second World War: Fighters, Volume Four. London: Macdonald, 1961 (6th impression 1969). {{ISBN|0-356-01448-7}}.
• Green, William and Gordon Swanborough. WW2 Aircraft Fact Files: US Army Air Force Fighters, Part 1. London: Macdonald and Jane's Publishers Ltd., 1977. {{ISBN|0-356-08218-0}}.
• Knaack, Marcelle Size. Encyclopedia of US Air Force Aircraft and Missile Systems: Volume 1 Post-World War II Fighters 1945-1973. Washington, DC: Office of Air Force History, 1978. {{ISBN|0-912799-59-5}}.
• Koehnen, Richard C. "Bell's No Name Fighter." Airpower, Vol. 12, no. 1. January 1982.
• Pelletier, Alain J. Bell Aircraft Since 1935. Annapolis, MD: Naval Institute Press, 1992. {{ISBN|1-55750-056-8}}.

{{commons category|Bell XP-83}}

• [http://www.joebaugher.com/usaf_fighters/p83.html Joe Baugher's XP-83 page]
• [https://web.archive.org/web/20110710162717/http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2329 USAF Museum page]
• [http://www.joebaugher.com/usaf_fighters/p83.html]
• [http://www.joebaugher.com/usaf_fighters/p83.html]
• [http://www.warbirdsresourcegroup.org/URG/xp83.html Warbirds Resource Group page, with photos]

{{Bell Aircraft}}

{{USAF fighters}}

P-083

Bell P-83

Category:Twinjets

Category:Cancelled military aircraft projects of the United States

Category:Aircraft first flown in 1945

Category:World War II jet aircraft of the United States

Category:Mid-wing aircraft

Category:Aircraft with retractable tricycle landing gear