P-39 Airacobra

P-39 Airacobra. The Bell P-39 Airacobra was a single-engine fighter aircraft produced by Bell Aircraft for the United States Army Air Forces during World War II. Its radical design placed the Allison V-1710 engine behind the pilot, driving the propeller via a long shaft, and featured a 37 mm M4 cannon firing through the propeller hub. While its performance at high altitude was limited, the Airacobra found significant success as a low-altitude fighter and ground-attack aircraft, particularly with the Soviet Air Forces on the Eastern Front.

Design and development

The Airacobra's development was led by chief engineer Robert J. Woods at Bell Aircraft's plant in Buffalo, New York. The design centered on the innovative mid-engine layout, intended to improve maneuverability and accommodate heavy nose armament, including the powerful T9 cannon. This configuration also allowed for a tricycle landing gear, a novel feature for fighters of the era. The aircraft's Allison V-1710 liquid-cooled engine was equipped with a single-stage supercharger, which proved inadequate for high-altitude combat over Western Europe. The prototype, designated XP-39, first flew in 1938, with subsequent testing conducted with input from the National Advisory Committee for Aeronautics. Despite its performance limitations, the design was ordered into mass production for the United States Army Air Corps as war loomed.

Operational history

The Airacobra's operational service was marked by starkly different results across various theaters of World War II. With the Royal Air Force, it saw brief and unsatisfactory service, being quickly withdrawn from frontline duties over Europe. The United States Army Air Forces employed P-39s in the Pacific Theater, where they achieved some success at lower altitudes during the Guadalcanal Campaign and in the Aleutian Islands Campaign. The aircraft's most celebrated and effective service was with the Soviet Air Forces, which received nearly half of all Airacobras built via Lend-Lease shipments. Soviet pilots, like ace Aleksandr Pokryshkin of the 16th Guards Fighter Aviation Regiment, valued its robust construction, heavy firepower, and excellent low-altitude performance for air combat and ground attack on the Eastern Front. It also saw service with the Free French Air Force and the Italian Co-Belligerent Air Force later in the war.

Variants

The primary production model was the P-39D, which introduced self-sealing fuel tanks and increased armament. The P-39F and P-39J featured different propeller assemblies. The P-39K, P-39L, and P-39M models incorporated successive engine and minor equipment changes. The definitive and most-produced variant was the P-39Q, which replaced the underwing gun pods with a single .50-caliber machine gun in each wing and was widely used by the Soviet Union. A two-seat trainer version was designated the TP-39Q. The experimental XP-39E featured a laminar flow wing and a different engine, leading to the development of the improved Bell P-63 Kingcobra.

Operators

The primary military operators were the United States Army Air Forces and the Soviet Air Forces. Other Allied operators included the Royal Air Force, the Royal Australian Air Force, and the Polish Air Force in exile. The Italian Co-Belligerent Air Force used it after the Armistice of Cassibile. Post-war, the French Air Force and the Italian Air Force operated small numbers, and examples were supplied to the Portuguese Air Force. Captured aircraft were evaluated by the Luftwaffe and the Imperial Japanese Army Air Service.

Specifications (P-39Q Airacobra)

* **Crew:** 1 * **Length:** 30 ft 2 in (9.19 m) * **Wingspan:** 34 ft 0 in (10.36 m) * **Height:** 12 ft 5 in (3.78 m) * **Empty weight:** 5,692 lb (2,582 kg) * **Powerplant:** 1 × Allison V-1710-85 liquid-cooled V-12 piston engine, 1,200 hp (890 kW) * **Maximum speed:** 376 mph (605 km/h, 327 kn) at 9,500 ft (2,900 m) * **Range:** 525 mi (845 km, 456 nmi) * **Service ceiling:** 35,000 ft (11,000 m) * **Armament:** * 1 × 37 mm M4 cannon (30 rounds) * 2 × .50 caliber M2 Browning machine guns in the nose (200 rpg) * 2 × .50 caliber M2 Browning machine guns in underwing pods (300 rpg) * Up to 500 lb (230 kg) of bombs externally

Category:Fighter aircraft Category:World War II aircraft of the United States