P-39 Airacobra Fighter

Introduction

The Bell P-39 Airacobra was an early American fighter aircraft at the out break of World War II. In the “Lend-Lease” plan with eh Soviet Union, the P-39 was one of their favorite fighters as it had more victories than any other American aircraft that was sold to the USSR.

The British RAF and the Italian Air Force (after the fall of Fascist Italy) were also users of this aircraft. It was the first American Fighter to have tricycle landing gear. The unique feature was the engine was in the center of the fuselage behind the pilot.

Due to a lack of a turbo-supercharger, it was not a good high altitude aircraft. The Soviets liked it because they used it for medium to low altitude combat every effectively. It was a deadly ground attack fighter with a deadly nose cannon.

Design and Development

In February 1937, The United States Army Air Corp (USAAC) issued a request for proposals for a single engine, high altitude interceptor. They required the aircraft to fly at least 360mph, climb to 20,000 ft in 6 minutes, tricycle land gear with heavy armament including a cannon, water-cooled Allison engine with a General Electric turbupercharger.

Bell’s early design had been with another aircraft called the Bell YFM-1 Airacuda (or Model 12). Taking some of the features of the Model12 the Bell Engineers then designed an aircraft with the Allison V-12 engine in the center of the fuselage behind the cockpit. The engine drove a long shaft to the propeller.

The reason for this strange configurations was so an Oldsmobile T9 cannon could be placed in front to fire through the propeller hub. This cannon was not like a “Civil War” cannon firing large cannon balls, but firing much smaller, but very lethal projectiles.   This did not work in a useful manner, as the cannon was slow firing, limited ammunition and jammed frequently.

The long shaft through the cockpit proved to satisfactory with virtually no problems. The cockpit had side doors rather than a sliding canopy. This permitted easy access in and out of the aircraft when it was on the ground, but difficult in the air in bailing out.

This new design was called the XP-39 and was approved by USAAC for testing. The early test results were 390 mph and climbing to 20,000 in just 5 minutes. But the performance quickly bled off at higher altitudes.

The XP-39 was taken into wind tunnel testing to improve the airspeed by reducing drag. In the end the turbo-supercharger vent had to be removed and the turbo-supercharge was to housed internally and vents made for the exhaust gasses. The problem was there was no internal space with the engine in the fuselage for the turbo-supercharger.

But the drag reduction engineering program increased the speed to 439 mph. Since it was impossible to internally store the turbo-supercharger, it was decided not to use thus type but to use a single-stage, single-speed supercharger This greatly reduced the aircraft’s high altitude performance.

After some engineer engineering modifications such as self-sealing fuel tanks, machine guns on the wings and armor around the cockpit, The new designation was the P-39D. USAAC ordered 80 of these aircraft and were America’s’ first modern fighter aircraft, be as it was.

Bell P-39 Airacobra 3/4 front view. (U.S. Air Force photo)

Operational History

The USAAF (United States Army Air Force) in 1941 took delivery of 200 P-39s. When the outbreak of World War II took place in the United States on December 7,1941, many of the P-39s were first sent to training units. A squadron of the Aracobras became part of the 5th Air Force in the Pacific and saw action in the Battle of Guadalcanal

The P-39 was unable to perform well against the Japanese Zeros because of the high altitude factor, but a fine job against land and sea targets. In Spite of the high altitude problem, the P-39 did well at lower altitudes against man Japanese aircraft have claimed 80 victories.

Lt. Bill Fielder became an ace in the Pacific said that the P-39 did well against Zeros and Ki-43 (land based aircraft that were similar to the Zero) as long as the P-39 remained at lower altitudes which probably was about 15,000 feet at the maximum.   This of course was because the lack of a good supercharger on the Airacobra.

The 350th Fighter group were the biggest user of the P-39 in the Middle East flying out of North Africa and eventually Italy, usually on maritime missions

The USSR was the biggest user of the P-39 of any other  American aircraft in the Lend-Lease plan. . The nature of air combat on the Eastern Front was low speeds and low altitudes which was a perfect environment for the strengths of the Airacobra such as sturdy constructions,

deadly armament, reliable radios, and a pilot friendly cockpit. Soviet pilot Nikolai Golodnikov tells of his experience with the P-39:

“I liked th Cobra especially the Q-5 version. It was the lightest version of all Cobras and the best fighter I ever flew. The cockpit was very comfortable and visibility was outstanding. The instrument was very ergonomic, with the entire complement of instruments right up to an artificial horizon. It even had a relief tube in the shape of a funnel. The armor glass was very strong, extremely thick. The armor on the back was also thick. The oxygen equipment was reliable, although the mask was quite small, only covering the nose and mouth. We only wore that mask at high altitude. The HF (High Frequency) radio was powerful and reliable and clear. ”

Other countries that used the P-39 during the War; Australia, Free French, Italy (after the collapse of the Fascist), and Portugal

Where you can see the P-39 Airacobra:

Australia – Mareeba, Queensland, Glenrowan, Victoria

Finland – Tikkakoski

Papia New Guinea – Goroka

Russia -Gagarin, Yakutsk, Sakha Republic

United States

Airworthy
42-8740 – Yanks Air Museum, Chino, California

Miss Connie – Commemorative Air Force, San Marcos, Texas

Brooklyn Bum – Lewis Air Legends, San Antonio, Texas.

On Display

Girlie – Pima Air and Space Museum, Tucson, Arizona

Snooks 2nd/Betty Lou 3rd – Buffalo and Erie County Navel and Military Park, Buffalo, New York

Small Fry/Sir Echo – Planes of Fame, Chino, California

Whistlin Britches – Air Zoo, Kalamazoo, Michigan.

This is Just a Partial List of the P-39 Airacobra, Check With Your Local Air Museum for More Information on the P-39

 TECH SPECS P-39Q

Wingspan: 34 ft 0 in

Length: 30 ft 82in

Height: 12 ft 5 in

Weight: 6,516 lbs (empty); MGTOW* 8,400 lbs *Maximum Gross Take-Off Weight

Max Speed: 389 mph

Ceiling: 35,000 ft

Range: 525mi (combat)

Engine: 1/Allison V-17-85 liquid cooled V-12, 1,200 hp

Crew: 1

THANKS FOR READING!  I HOPE THIS WAS INFORMATIVE!    

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