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Vultee XP-81


Mixed-Power Fighter Prototype Aircraft (1945)


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Jump-to: Specifications

The Vultee XP-81 was a combination fighter powered by both turboprop and turbojet powerplant technology.



Authored By: Staff Writer | Last Edited: 01/21/2019 | Content ©www.MilitaryFactory.com; the following text is exclusive to this site.
The Consolidated Vultee XP-81 was a proposed long-range, high-altitude fighter design that was to be the answer for bomber escorting in Europe but, more importantly, throughout the island hopping campaign of the Pacific. The XP-81 melded together the power of the ever-evolving turbojet engines and the development of America's first turboprop engine.

The single-seat, twin engine fighter was designed around the complicated General Electric powerplant creations that would never live up to expectations with the XP-81 design. To feed the two-engine idea, the aircraft itself was to be of a rather large design for a fighter when compared to its contemporaries in the P-51 Mustang, P-38 Lightning and the P-47 Thunderbolt.

The pilot sat forward of the wing assemblies, offering up tremendous visibility from the bubble canopy overlooking the front part of the aircraft. A four-blade propeller sat at front, powered by the turboprop assembly in the nose. The laminar flow wings sat directly in the center of the design with a low tricycle landing gear system underneath the massive spread. Twin intakes were mounted just aft of the cockpit on the top portion of the fuselage. These intakes were placed as such to feed the single turbojet engine jettisoning exhaust through the rear under the rudder and tail assemblies.

On paper, the design was sound. Estimated capabilities proposed that the system would be able to achieve over 500 miles per hour and reach over 35,000 feet. As impressive ranges were a part of the American aircraft pedigree throughout the war (British and German aircraft seldom were long-range threats to one another), the XP-81 was to have a distance of 2,500 miles - more than enough to keep up with the B-17 and B-29 bomber formations pounding The Reich and the Empire of Japan.

Alas, troubles with the powerplant forced the only flying prototype to be fitted with a P-51 engine alternative. When the turboprop did arrive and was installed, the system produced well under expectations - a full 1,000 horsepower under proposed capabilities in fact. With the war in Europe now held in check by the existing breed of fighter escorts and the island hopping campaigns of the Pacific progressing equally well - though slow-going and costly to US ground forces - the XP-81 project was cancelled along with the order of 13 YP-81 developmental models.

Though envisioned with an armament array of 6 x .50 caliber machine guns, the weapons were never fitted to the aircraft. Provisions for drop tanks or bombs can be assumed. The two surviving prototypes were later found scrapped of most anything of value and, as of this writing, are awaiting their fate with the USAF - perhaps seeing fit to restore at least one model for the USAF Museum in Dayton, Ohio. A sound concept nonetheless, the twin engine creation never really got off the ground.

Specifications



Service Year
1945

Origin
United States national flag graphic
United States

Status
CANCELLED
Development Ended.
Crew
1

Production
2
UNITS


Vultee / Consolidated / Convair - USA
National flag of the United States United States (cancelled)
(OPERATORS list includes past, present, and future operators when applicable)
Air-to-Air Combat, Fighter
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.
X-Plane (Developmental, Prototype, Technology Demonstrator)
Aircraft developed for the role of prototyping, technology demonstration, or research / data collection.


Length
44.9 ft
(13.69 m)
Width/Span
50.5 ft
(15.39 m)
Height
14.0 ft
(4.27 m)
Empty Wgt
12,798 lb
(5,805 kg)
MTOW
19,500 lb
(8,845 kg)
Wgt Diff
+6,702 lb
(+3,040 kg)
(Showcased structural values pertain to the base Vultee XP-81 production variant)
Installed: 1 x General Electric XT-31-GE-1 turboprop engine developing 2,300 horsepower and 1 x General Electric J33-GE-5 turbojet engine developing 3,750 lb of thrust.
Max Speed
506 mph
(815 kph | 440 kts)
Ceiling
35,499 ft
(10,820 m | 7 mi)
Range
2,500 mi
(4,023 km | 7,451 nm)
Rate-of-Climb
4,500 ft/min
(1,372 m/min)


♦ MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030


(Showcased performance specifications pertain to the base Vultee XP-81 production variant. Compare this aircraft entry against any other in our database. View aircraft by powerplant type)
PROPOSED:
6 x 12.7mm Browning Heavy Machine Guns (never installed).


Supported Types


Graphical image of an aircraft medium machine gun
Graphical image of an aircraft heavy machine gun


(Not all ordnance types may be represented in the showcase above)
Hardpoint Mountings: 0


XP-81 - Two prototype examples as S/N 44-91000 and 44-91001.


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