Bell P-63 Kingcobra

Bell P-63 Kingcobra. The Bell P-63 Kingcobra was an American fighter aircraft developed during World War II by Bell Aircraft as a successor to the Bell P-39 Airacobra. Although sharing a similar layout with its predecessor, it incorporated significant improvements including a more powerful Allison V-1710 engine, a laminar flow wing, and enhanced armor protection. Despite its capabilities, it saw limited service with the United States Army Air Forces and was primarily supplied to Allied nations under the Lend-Lease program, with the Soviet Union becoming its largest operator, where it served effectively on the Eastern Front.

Development and design

The development of the aircraft was led by chief engineer Robert J. Woods at Bell Aircraft's plant in Buffalo, New York, aiming to address the shortcomings of the earlier Bell P-39 Airacobra. The design retained the mid-engine, cannon-through-propeller-hub configuration but featured a completely new, longer fuselage and a distinctive laminar flow wing developed in collaboration with the National Advisory Committee for Aeronautics. Power was provided by a more advanced version of the Allison V-1710 liquid-cooled V-12 engine, which drove a four-bladed Aeroproducts propeller. The aircraft's armament centered on a formidable 37 mm M4 cannon firing through the propeller hub, supplemented by two synchronized .50 caliber M2 Browning machine guns in the nose and hardpoints for external stores. The United States Army Air Forces ordered the prototype, designated XP-63, which first flew on 7 December 1942.

Operational history

The United States Army Air Forces found the aircraft's performance insufficient to challenge frontline German fighters like the Messerschmitt Bf 109 and Focke-Wulf Fw 190 in the European Theater, leading to its rejection for combat squadrons. Consequently, nearly all production was diverted to Allied nations under the Lend-Lease program. The Soviet Union received 2,397 aircraft, where it was employed extensively by the Soviet Air Forces for ground-attack and fighter-bomber duties on the Eastern Front, proving effective in the later stages of the war including the Vistula–Oder Offensive and the Battle of Berlin. A small number were also supplied to the Free French Air Force, which used them in combat during the invasion of Southern France and over Germany. The United States used some for target-towing and as manned aerial targets in a specialized, armored version for training.

Variants

The primary production model was the P-63A, which featured various sub-models with incremental improvements in armor, fuel capacity, and engine ratings. The P-63C introduced a more powerful Allison V-1710 engine with water injection and a larger vertical stabilizer. The P-63D was an experimental variant with a distinctive bubble canopy and a Continental I-1430 engine, but only one was built. The P-63E was similar to the C-model but with a modified wing and only 13 produced. The most unusual variant was the RP-63 "Pinball", a heavily armored version used by the United States Army Air Forces for gunnery training, where frangible bullets would trigger lights upon hitting its reinforced airframe. The P-63F, with a larger fin and rudder, was the final variant, but only two were completed before the end of World War II.

Operators

The largest operator was the Soviet Union, whose Soviet Air Forces utilized it as a primary fighter-bomber. The Free French Air Force operated the type with the GC II/5 and GC II/9 squadrons. Under Lend-Lease, a small number were also delivered to the United Kingdom for evaluation by the Royal Air Force, but it was not adopted. Post-war, the aircraft saw service with the air forces of several countries including Honduras, which used them into the early 1950s, and the Italian Air Force, which briefly operated a few. Some were also transferred to the Fuerza Aérea de Guatemala and the Fuerza Aérea Dominicana.

Specifications (P-63A-10)

* **Crew:** 1 * **Length:** 32 ft 8 in (9.96 m) * **Wingspan:** 38 ft 4 in (11.68 m) * **Height:** 12 ft 7 in (3.84 m) * **Wing area:** 248 sq ft (23.0 m²) * **Empty weight:** 6,375 lb (2,892 kg) * **Gross weight:** 8,800 lb (3,992 kg) * **Powerplant:** 1 × Allison V-1710-93 liquid-cooled V-12 piston engine, 1,325 hp (988 kW) * **Maximum speed:** 410 mph (660 km/h, 360 kn) at 25,000 ft (7,600 m) * **Range:** 450 mi (720 km, 390 nmi) * **Service ceiling:** 43,000 ft (13,000 m) * **Armament:** 1 × 37 mm M4 cannon with 30 rounds, 2 × .50 in (12.7 mm) M2 Browning machine guns with 270 rounds per gun, provisions for up to 1,500 lb (680 kg) of bombs or three M10 rocket launchers for 4.5 in (114 mm) rockets.

Category:United States fighter aircraft 1940–1949 Category:World War II fighter aircraft of the United States Category:Bell aircraft