|Manufacturer||Bell Aircraft Corporation|
|Maiden Flight||6 April 1938|
Contributor: C. Peter Chen
In Feb 1937, United States Army Air Corps Lieutenant Benjamin Kelsey issued a request for a new heavily armed, high performance, high altitude, single seat fighter. The manufacturer Bell took a new approach to fulfill this request. Instead of the usual manner of designing an aircraft around a suitable engine, Bell engineers designed this aircraft around its heavy weapons. This resulted in the engine being located in the center of the aircraft just behind the cockpit which drove the propellers through a shaft 10 feet in length that ran in the cockpit floor. This configuration freed up the nose to house the heavy weapons that the Army had called for, which included a 37-millimeter T9 cannon. Because of this design, space for fuel storage was limited, thus this aircraft was to serve in short range missions only.
The prototype aircraft XP-39 took flight on 6 Apr 1938 at Wright Field, Ohio, United States. Impressed with its ability to reach 630 kilometers per hour at the altitude of 6,100 meters in under 5 minutes, the US Army placed an order for 12 YP-39 prototype aircraft for further testing. On 10 Aug 1939, an order for 80 production aircraft, at this time designated P-45, was placed; the designation would change back to P-39 before the delivery of the first aircraft.
In Sep 1940, the British Royal Air Force ordered 386 P-39D Airacobra fighters. The order number would later increase to 675. The first fighter arrived to the No. 601 Squadron RAF on 6 Aug 1941. The British pilots found the performance inadequate, especially at high altitudes. This was caused by the lack of turbo-superchargers, something equipped in the prototype but was removed from the design right before the design entered production. Also, the prototype lacked the heavy armor that was equipped in production models. On 9 Oct 1941, No. 601 Squadron RAF mounted a mission with four P-39 aircraft, targeting German barges near Dunkirk, France. This mission was to be the last operational mission with P-39 aircraft for the RAF. In Mar 1942, the squadron was re-equipped with Spitfire fighters. Ultimately, the RAF only retained 80 P-39 fighters for its own use, transferring the other 200 that it had received to the Soviet Union.
When WW2 began for the United States in Dec 1941, P-39 Airacobra fighters were one of US Army's main fighter models, although many American pilots had similar negative opinions as their British counterparts. Many of the first American squadrons which were originally assigned P-39 Airacobra fighters flew Spitfire V fighters instead. 200 P-39 Airacobra fighters, re-designated P-400, were sent to the South Pacific, where they were used against Japanese aircraft in Guadalcanal of the Solomon Islands. Later in the war, in Feb 1944, the Tuskegee African-American pilots were assigned P-39 aircraft for the Italian campaign; after supporting the landing operations at Anzio and raiding German and Italian shipping, they were replaced by P-47 Thunderbolt and P-51 Mustang fighters in Jun and Jul 1944, respectively. USAAF Lieutenant Bill Fiedler became the only American to become an ace with the P-39 Airacobra fighter.
Soviet Air Force pilots discovered a problem with P-39 Airacobra fighters in which the aircraft could enter dangerous flat spins when the aircraft was improperly loaded, i.e. not enough weight in the front of the aircraft. Bell did not have a solution for this problem other than stressing the importance of proper weight distribution. Despite of this issue, Soviet pilots appreciated these fighters for their air-to-air combat capabilities, particularly regarding the 37-millimeter T9 cannons that could inflict heavy damage to enemy aircraft with only a few shots. While British and American pilots complained of the inadequacies in high altitudes, Soviet pilots found this characteristic to be of little concern, as the war in Eastern Europe required fewer high altitude operations. Soviet pilot Nikolai G. Golodnikov noted:
Many Soviet pilots, including Aleksandr Pokryshkin and Grigori Rechkalov, reached ace status while flying P-39 Airacobra fighters.
The Royal Australian Air Force received used American P-39 Airacobra fighters in Jul 1942 as a measure to quickly bolster the Australian air defense capability. None of them saw combat before the P-39 fighters were replaced by better performing aircraft.
Between mid-1943 and late-1944, Free French forces operated some P-39N and P-39Q fighters, based in North Africa. They were replaced by P-47 Thunderbolt fighters in the latter part of the war.
In Jun 1944, as a part of the Allies after the fall of Benito Mussolini's government in 1943, Italy received 170 P-39 fighters. 149 of them were used by the Italian Air Force, some for front line service while others were retained for training missions only. After the war, Italy purchased 46 surviving aircraft from the US at an inexpensive price and kept them in service until 1951.
Production for P-39 Airacobra fighters ended in Aug 1944. By this time, 9,558 aircraft were built, about half of which, 4,773, were sent to the Soviet Union. 7 of them were delivered to the US Navy for the development of radio-controlled drone aircraft. On 13 May 1940, a naval prototype of the design took flight under the designation XFL-1 Airabonita; it was eventually rejected thus never entered production.
P-39 Airacobra Timeline
|6 Apr 1938||P-39 Airacobra took its first flight.|
|6 Jul 1941||The first Bell Airacobra fighter arrived in the United Kingdom. By the end of Sep 1941, eleven machines had been received by No. 601 Squadron, but during trials by the Air Fighting Development Unit at Duxford it was found that the much publicised performance figures claimed by the manufacturer were much overrated (having been obtained by a highly polished machine weighing a ton less than the production aircraft delivered to the RAF). The maximum speed for example being some 33 mph slower than anticipated and, although pleasant enough to fly, was definitely inferior to the Hurricane and Spitfire in climb rate and ceiling.|
|Machinery||One Allison V-1710-85 liquid-cooled V-12 engine rated at 1,200hp|
|Armament||1x37mm M4 cannon, 2x12.7mm M2 machine guns, 4x7.62mm M1919 machine guns, optional 230kg bombs|
|Wing Area||19.80 m²|
|Weight, Empty||2,425 kg|
|Weight, Loaded||3,347 kg|
|Weight, Maximum||3,800 kg|
|Speed, Maximum||605 km/h|
|Rate of Climb||19.00 m/s|
|Service Ceiling||10,700 m|
|Range, Normal||840 km|
|Range, Maximum||1,770 km|
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