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Bell XFL Airabonita

United States (1940)

Detailing the development and operational history of the Bell XFL Airabonita Carrierborne Interceptor.

 Entry last updated on 5/16/2016; Authored by Staff Writer; Content ©

  Bell XFL Airabonita  
Picture of Bell XFL Airabonita Carrierborne Interceptor
Picture of Bell XFL Airabonita Carrierborne Interceptor Picture of Bell XFL Airabonita Carrierborne InterceptorPicture of Bell XFL Airabonita Carrierborne Interceptor

The Bell XFL-1 Airabonita was a failed attempt to convert the land-based Bell P-39 Airacobra into a viable U.S. Navy carrierborne interceptor.

The XFL "Airabonita" was a Bell Aircraft Company product developed in parallel with the P-39 Airacobra, a land-based USAAF (United States Army Air Forces) design that eventually achieved operational status. In essence, the Airabonita was a "navalized" version of the Airacobra with some navy-induced modifications for operations aboard carriers. Despite the attempt, the Airabonita was plagued by engine and undercarriage issues throughout its development and proved wholly underpowered to most other fighter aircraft of the time. The United States Navy eventually decided on other pursuits and the single $125,000 XFL prototype was inevitably laid to rest.

With its origins in the P-39 army design, the XFL model retained most of the same exterior shape. Intended for use by the United States Navy as an interceptor aircraft, the Airabonita was designed as such, with a conventional undercarriage system (with two main landing gears and a tail wheel) as opposed to the tricycle type offered in the P-39. The air frame was revised and reinforced for the rigors of carrier operations. An arrestor hook was added under the base of the empennage. The Airabonita still retained the automobile-style doors for entry and exit.

The aircraft was to be powered by a single Allison XV-1710-6 12-cylinder Vee liquid-cooled inline engine of 1,150 horsepower. The engine was, as in the P-39, mounted aft of the cockpit and powered a forward-mounted, three-blade propeller via a 10.38 foot shaft running under the cockpit floor. It should be noted that this particular engine lacked the turbo charger as found on the XP-39, already a detrimental fact that would do the system in. The coolant radiators were moved from the wing center section and placed in underwing fairings. Armament would have still revolved around the 37mm Oldsmobile T9 cannon firing through the propeller hub. This cannon could be replaced by a single 12.7mm Browning M2/AN heavy machine gun if desired, potentially saving on critical weight while providing a weapon with a higher rate of fire. Additionally, firepower was to be provided through 2 x 7.62mm (.303 caliber) machine guns mounted in the cowl. By any measure, this arrangement would have been a notch under most formidable armament arrays at the time for even the land-based P-39 utilized more heavy caliber machine guns alongside its cannon armament.

The Airabonita achieved first flight on May 13th, 1940 but faced an uphill battle from the start as deliveries of the Allison engines were delayed for a time. This delay compounded the Airabonita's difficulties when the engines did eventually arrive for the powerplants exhibited issues all their own. The use of the conventional undercarriage also worked against the XFL as problems began to develop during testing. As a result, the system had to be shipped back to Bell Aircraft for further revisions in late 1941. By this time, however, the United States Navy decided to pursue a different direction and cancelled development of the XFL in whole. The single XFL-1 prototype was then used in a series of armament tests until it was eventually scrapped.

Performance specifications listed a top speed of 307 miles per hour with a ceiling of 30,900 feet. A range of 1,072 miles was achievable with a rate-of-climb topping 2,630 feet per minute. By all accounts, the XFL would have been wholly outclassed when one considers the speedy F4U Corsair coming out of development. Even the standard naval F4F Wildcat operated better at altitude than the Airabonita seemingly would have. This particular Allison engine - with its single-speed supercharger - also had a tendency to underperform at altitude as it did in the P-40 Warhawk, P-39 Airacobra and even in the P-38 Lightning - the latter needing exhaust-driven superchargers to have acceptable altitude performance.
Picture of the Bell XFL Airabonita Carrierborne Interceptor
Picture of the Bell XFL Airabonita Carrierborne Interceptor

Any available statistics for the Bell XFL Airabonita Carrierborne Interceptor are showcased in the areas immediately below. Categories include basic specifications covering country-of-origin, operational status, manufacture(s) and total quantitative production. Other qualities showcased are related to structural values (namely dimensions), installed power and standard day performance figures, installed or proposed armament and mission equipment (if any), global users (from A-to-Z) and series model variants (if any).
Bell XFL-1 Airabonita Specifications
National Flag Graphic
United States
Year: 1940
Type: Carrierborne Interceptor
Manufacturer(s): Bell Aircraft Company - USA
Production: 1
Supported Mission Types
Ground Attack
Close-Air Support
Airborne Early Warning
Electronic Warfare
Aerial Tanker
Passenger Industry
VIP Travel
Business Travel
Special Forces
Crew: 1
Length: 29.82 ft (9.09 m)
Width: 35.04 ft (10.68 m)
Height: 12.83 ft (3.91 m)
Empty Weight: 5,165 lb (2,343 kg)
MTOW: 7,218 lb (3,274 kg)

Installed Power
1 x Allison XV-1710-6 12-cylinder Vee liquid-cooled inline engine developing 1,150 horsepower.

Standard Day Performance
Maximum Speed: 336 mph (541 kph; 292 kts)
Maximum Range: 1,072 mi (1,725 km; 931 nm)
Service Ceiling: 30,922 ft (9,425 m; 5.86 mi)
Rate-of-Climb: 2,630 ft/min (802 m/min)

1 x 37mm cannon OR 1 x 12.7mm machine gun firing through the propeller hub.
2 x 7.62mm machine guns in nose cowl

Operators List
United States (cancelled)

Series Model Variants
• Model 12 - Bell Aircraft Designation of XP-39
• XP-39 - Prototype Designation for P-39 Airacobra model for USAAC.
• XFL-1 - Navalized single prototype example based on XP-39; traditional undercarriage with two main gears and tail wheel per USN requirements; 1 x 37mm cannon OR 1 x 12.7mm machine gun as main armament; 2 x 7.62mm machine guns; 1 x Allison XV-1710-6 12-cylinder liquid-cooled inline engine of 1,150 horsepower; underwing radiators; arrestor hook; enlarged vertical surfaces; reinforced airframe.

Supported Weapon Systems
Graphical image of an aircraft medium machine gun
Graphical image of an aircraft heavy machine gun
Graphical image of an aircrat automatic cannon

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