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Wednesday, March 9, 2011

Bell P-63 Kingcobra

P-63 Kingcobra
Role Fighter
Manufacturer Bell Aircraft Corporation
First flight 7 December 1942
Introduced October 1943
Status Retired
Primary users United States Army Air Forces
Soviet Air Force
French Air Force
Produced 1943–1945
Number built 3,303
Unit cost $65,914 USD in 1945 ($797,000 in today's dollars) [1]
Developed from P-39 Airacobra
Variants Bell L-39
The Bell P-63 Kingcobra (Model 24) was a United States fighter aircraft developed in World War II from the P-39 Airacobra in an attempt to correct that aircraft's deficiencies. Although the aircraft was not accepted for combat use by the United States Army Air Forces, it was successfully adopted by the Soviet Air Force.[2]




Contents

  • 1 Design and development
    • 1.1 XP-39E
    • 1.2 XP-63
    • 1.3 Swept-wing L-39
  • 2 Operational service
    • 2.1 "Pinball" operations
    • 2.2 Postwar air racers
  • 3 Variants
  • 4 Operators
  • 5 Survivors
  • 6 Specifications (P-63A)

Design and development

XP-39E

While the P-39 had originally been introduced as an interceptor, later in its development it was decided to reduce the cost and complexity of the engine by removing the turbocharger and replacing it with a simpler mechanical supercharger. High-altitude performance suffered dramatically as a result, and Bell proposed an experimental series to test out a variety of solutions.
The resulting XP-39E featured two primary changes from the earlier P-39D from which it was developed. One change was the addition of a new laminar flow wing section, which had recently been revealed to the industry through a National Advisory Committee for Aeronautics (NACA) research project. The other was a switch to the Continental I-1430 engine, which featured an improved overall design developed from the hyper engine efforts, as well as an improved supercharger.
Three prototypes were ordered in April 1941 with serials 41-19501, 41-19502 and 42-7164. The V-1430 was having continued development problems and could not be delivered in time, so it was replaced by the newer -47 version of the Allison V-1710 that powered the basic P-39. Each of the prototypes tested different wing and tail configurations: 41-19501 had a rounded vertical tail, but the tailplane had squared-off tips, 41-19502 had a squared-off fin and rudder and large wing fillets while 42-7164 had all its flight surfaces squared off. The XP-39E proved to be faster than the standard Airacobra; a maximum speed of 386 mph (621 km/h) being attained at 21,680 ft (6,610 m) during tests. However, the XP-39E was considered to be inferior to the stock P-39 Airacobra in all other respects, so it was not ordered into production.

XP-63

Bell plant assembly line near Niagara Falls, New York
Although the XP-39E proved to be disappointing, the USAAF was nevertheless interested in an even larger aircraft based on the same basic layout. Even before its first flight, the USAAF placed an order on 27 June 1941 for two prototypes of an enlarged version powered by the same V-1710-47 engine. The new design was given the designation XP-63 and serials were 41-19511 and 41-19512. A third prototype was also ordered, 42-78015, this one featuring the Packard V-1650, the U.S.-built version of the Rolls-Royce Merlin engine.
The XP-87897 was larger in all dimensions than the Airacobra. The laminar flow wings increased the overall span by 4.33 ft (1.32 m) to 38.33 ft (11.68 m). The engine was fitted with a second supercharger supplementing the normal single-stage supercharger. At higher altitudes when additional boost was required, a hydraulic clutch would engage the second supercharger, adding 10,000 ft (3,000 m) to the service ceiling. A larger four-bladed propeller was also standardized. A persistent complaint against the Airacobra was that its nose armament was not easily accessible for ground maintenance, and in order to cure this problem, the XP-63 airframe was fitted with larger cowling panels.
In September 1942, even before the prototype flew, the USAAF ordered it into production as the P-63A (Model 33). The P-63A's armament was to be the same as that of the then-current P-39Q, a single 37 mm (1.46 in) M4 cannon firing through the propeller hub, two .50 in (12.7 mm) machine guns in the upper nose firing through the prop, and two .50 in (12.7 mm) machine guns in underwing gondolas. The trajectory of the .50 in guns was far flatter than that of the cannon.
The first prototype, 41-19511, flew for the first time on 7 December 1942. It was destroyed on 28 January 1943 when its landing gear failed to extend. The second prototype, 41-19512, followed on 5 February 1943. It too was destroyed, this time due to an engine failure. The Merlin-engined 42-78015 was later delivered with another Allison instead, as the Merlins were primarily needed for the P-51 Mustang. Nevertheless the new -93 version of the Allison had a war emergency rating of 1,500 hp (1,100 kW) at sea level, making this prototype one of the fastest Kingcobras built, attaining 421 mph (678 km/h) at 24,100 ft (7,300 m).
Deliveries of production P-63As began in October 1943. The USAAF concluded the Kingcobra was inferior to the Mustang, and declined to order larger quantities. American allies, particularly the Soviet Union, had a great need for fighter aircraft, however, and the Soviets were already the largest users of the Airacobra. Therefore, the Kingcobra was ordered into production to be delivered under Lend-Lease. In February 1944, the Soviet government sent a highly experienced test pilot, Andrey G. Kochetkov, and an aviation engineer, Fyodor P. Suprun, to the Bell factories to participate in the development of the first production variant, the P-63A. Initially ignored by Bell engineers, Kochetkov's expert testing of the machine's spin characteristics (which led to airframe buckling) eventually led to a significant Soviet role in the development. After flat spin recovery proved impossible, and upon Kochetkov's making a final recommendation that pilots should bail out upon entering such a spin, he received a commendation from the Irving Parachute Company. The Kingcobra’s maximum aft CG was moved forward to facilitate recovery from spins.[3]
P-63A-8, SN 269261, was extensively tested at TsAGI in what was then the world's largest wind tunnel. Soviet input was significant. With the Soviet Union being the largest buyer of the aircraft, Bell was quick to implement their suggestions. The vast majority of the changes in the A sub-variants were a direct result of Soviet input, e.g. increased pilot armor and fuselage hardpoint on the A-5, underwing hardpoints and extra fuel tanks on the A-6, etc. The Soviet Union even experimented with ski landing gear for the P-63A-6, but this never reached production. Most significantly, Soviet input resulted in moving the main cannon forward, favorably changing the center of gravity, and increasing its ammo load from 30 to 58 rounds for the A-9 variant. The P-63 had an impressive roll rate, besting the P-47, P-40, N1K2 and P-51 with a rate of 110° per second at 275 mph (443 km/h).[4]

Swept-wing L-39

L-39 with swept wings, extended rear fuselage, ventral tail fin and P-39 prop
Two war surplus P-63Cs were modified by Bell under Navy contract for flight testing of low-speed and stall characteristics of high-speed wing designs. The aircraft received new wings with adjustable leading edge slats, trailing edge flaps and a pronounced sweep of 35 degrees. The wings had no wheel wells; only the nose gear was retractable.[5] L-39-1 first flew 23 April 1946, demonstrating a need for extra tail surface and rear fuselage length to balance the aircraft in flight - the wing repositioning reduced empennage effectiveness and moved the center of lift aft. A lighter three-bladed propeller from a P-39Q-10 was mounted and the necessary changes to the empennage were made. L-39-2 incorporated these adjustments from the start. L-39-1 later went to NACA at Langley for wind tunnel testing, where much valuable data were gathered.[6] L-39-2 also served as a testbed for the Bell X-2 40-degree wing design.[unreliable source?][7]

Operational service

USAAF P-63A USAF photo
The first version to be supplied in quantity to the USSR was the P-63A-7 with a higher horizontal tail, and reinforced wings and fuselage. The fuselage proved to require strengthening, consequently in October 1944, a reinforcement kit for operational P-63s was developed.[8])
Air Transport Command ferry pilots, including U.S. women pilots of the WASP program, picked up the planes at the Bell factory at Niagara Falls, New York, and flew them to Great Falls, Montana and then onward via the Alaska-Siberia Route (ALSIB), through Canada, over Alaska where Russian ferry pilots, many of them women, would take delivery of the aircraft at Nome [9] and fly them to the Soviet Union over the Bering Strait. A total of 2,397 (2,672, according to other sources [10]) such aircraft were delivered to USSR, out of the overall 3,303 production aircraft (72.6%).[11]
By a 1943 agreement, P-63s were disallowed for Soviet use against Germany and were supposed to be concentrated in the Soviet Far East for an eventual attack on Japan.[citation needed] However, there are many unconfirmed reports from both the Soviet and German side that P-63s did indeed see service against the Luftwaffe. Most notably, one of Pokryshkin's pilots reports in his memoirs published in the 1990s that the entire 4th GvIAP was secretly converted to P-63s in 1944, while officially still flying P-39s. One account states they were in action at Königsberg, in Poland and in the final assault on Berlin. There are German reports of P-63s shot down by both fighters and flak. Nevertheless, all Soviet records show nothing but P-39s used against Germany.
In general, official Soviet histories played down the role of Lend-Lease supplied aircraft in favor of local designs, but it is known that the P-63 was a successful ground attack aircraft in Soviet service. The Soviets developed successful group aerial fighting tactics for the Bell fighters and P-39s scored a surprising number of aerial victories over German aircraft, mostly Junkers Ju-87 Stukas and bombers but including many advanced fighters as well. Low ceilings, short missions, good radios, a sealed and warm cockpit and ruggedness contributed to their effectiveness. To pilots who had once flown the tricky Polikarpov I-16, the aerodynamic quirks of the mid-engined aircraft were unimportant. In the Far East, P-63 and P-39 aircraft were used in the Soviet invasion of Manchukoku and northern Korea.
In the Pacific theatre, the Kingcobras flew escort, close air support and ground attack missions. The Soviet P-63s achieved their first air victory on 15 August 1945, when Lejtenant I. F. Miroshnichenko from 17th IAP/190 IAD, shot down a Nakajima Ki-43 Hayabusa Army fighter, off the coast of North Korea.[10]
Sufficient aircraft continued in use after the war for them to be given the NATO reporting name of Fred. By 9 May 1945, operational units had still 1,148 Kingcobras on strength.[10]
On 8 October 1950, two USAF F-80Cs from 49 FG breached the USSR's border and attacked Sukhaya Rechka airfield, making two strafing runs before returning to their home base. Although Soviet sources claim the attack was intentional, the pilots claimed it was a result of a navigational error.[12] The airfield belonged to the VVS TOF, but it was occupied by the 821 IAP / 190 IAD. Mostly aircraft of the 1st Squadron of 821 IAP were hit with 12 P-63s damaged, one P-63 burned to the ground while the other damaged aircraft were able to be repaired. No human losses were suffered.[13]
In 1945, 114 later models were delivered to the French Armée de l'Air, but they arrived too late to see service in World War II. They however saw service during the First Indochina War before being replaced in 1951.

"Pinball" operations

Its main use in American service was the unusual one of a manned flying target for gunnery practice.[citation needed] The aircraft was generally painted bright orange to increase its visibility. All armament and the regular armor was removed from these RP-63 aircraft, and over a ton of armored sheet metal was applied to the aircraft. This was fitted with sensors that would detect hits, and these hits were signaled by illuminating a light in the propeller hub where the cannon would have been. This earned the aircraft the unofficial nickname of Pinball. Special frangible rounds made of a lead/bakelite combination were developed that would disintegrate upon impact. These were known as the "Cartridge, Caliber .30, Frangible, Ball, M22." Ivan L. Hickman, a veteran Pinball pilot, eventually authored Operation Pinball, the most authoritative[citation needed] book on the series, published in 1990 by Motorbooks.

Postwar air racers

Numerous surplus P-63s ended up on the air racing circuit in the immediate postwar era.
Charles Tucker purchased two P-63s from the disposal facility at Kingman, Arizona just after the war. He entered one of them, the Tucker Special as Race 28 with the name Flying Red Horse emblazoned on the nose (civilian register N62995) in the 1946 Thompson Trophy race. He had clipped the wing 12 ft, 9 inches in an attempt to improve its speed, reducing the span to 25 ft, 9 inches. The second one (44-4126 (XN63231 Race 30) was intended for the 1946 Bendix cross country race. It was initially fitted with two wingtip drop tanks. In 1947, the drop tanks were removed and the wings were clipped to 28 ft 6 in (8.69 m)
Two other significant racers were flown later. Tipsy Miss, John Sandberg's clipped-wingtip P-63 unlimited racer, was identified as "Race 28," and painted in bright orange, white and black race numbers with a chrome spinner. Later sold to a European pilot, this P-63 was destroyed in an accident in 1990[14] Crazy Horse Campgrounds was the most radically modified P-63 Kingcobra ever. Larry Haven's "Race 90" clipped-wing unlimited racer had a tiny bubble canopy installed; it appeared in all silver (unpolished aluminum) finish with a white rudder and black trim. The aircraft later crashed into the ocean on a test flight in 1972.[15]

Variants

P-63 with underwing gun pods
  • XP-63 Prototypes (two) (company designation was Model 24); USAAF serials (41-19511 and 41-19512).
  • XP-63A Following the loss of the first two prototypes, an additional test aircraft was procured, USAAF serial 42-78015, originally ordered as a testbed for the proposed Rolls-Royce Merlin-poweredP-63B.
  • P-63A The production model Bell Model 33; 1725 P-63As produced in various sub-marks.
  • P-63B Proposed Rolls-Royce Merlin-poweredP-63B series was cancelled due to lack of availability of Merlin engines.
  • P-63C Second production series differed from the P-63A by being powered by the uprated Allison V-1710-117 engine with a war emergency rating of 1,500 hp (1,100 kW) at sea level and 1,800 hp (1,300 kW) with water injection. The wingspan was reduced by 10 inches. A total production run of 1,777 was completed.[unreliable source?][16]
  • P-63D One aircraft (43-11718) powered by an Allison V-1710-109 (E22) 1,425 hp featured 0.83 ft (0.25 m) wingspan increase (to 39.17 ft/ m), gross area being increased to 255 sq ft (23.7 m2) and, most noticeably, a rearward-sliding bubble canopy. The series was cancelled in 1945.[unreliable source?][16]
  • P-63E Essentially similar to the P-63D with the exception of a ventral fin extension and the use of a standard "cab"-style cockpit; only 13 built.
  • P-63F Bell Model 43 variant featured an enlarged vertical tail and Allison V-1710-135; only two (43-11719 and 43-11722) built.
  • RP-63A/C "Pinball" Target aircraft with five modified from P-63As and 95 modified on production lines; in 1948, surviving RP-63A aircraft were redesignated QF-63A. A further 200 production RP-63C aircraft were modified on the production line. Similarly, the surviving RP-63Cs were redesignated RP-63Cs. Many of the "target" aircraft were actually used as target tugs.
L-39-2 with swept wings and four-bladed prop.
  • RP-63G "Pinball" "Dedicated" flying targets which included two prototypes (43-11723 and 11724) and 30 production aircraft that incorporated a flush dorsal inlet but, more significantly, lights that would come on when the target was struck with frangible munitions. In 1948, the remaining RP-63Gs were redesignated QF-63Gs.[unreliable source?][16]
  • L-39 Two war surplus P-63Cs modified by Bell under Navy contract for flight testing of low-speed and stall characteristics of high-speed wing designs.

Operators

 France
 Honduras
 Soviet Union
 United Kingdom
(two aircraft only)
 United States

Survivors

P-63E-1BE 43-11728 "Pinball" of the Air Force Museum
Airworthy
Display
Restoration

Specifications (P-63A)

Data from Jane’s Fighting Aircraft of World War II[29]
General characteristics
  • Crew: 1
  • Length: 32 ft 8 in (10.0 m)
  • Wingspan: 38 ft 4 in (11.7 m)
  • Height: 12 ft 7 in (3.8 m)
  • Wing area: 248 sq ft (23 m²)
  • Empty weight: 6,800 lb (3,100 kg)
  • Loaded weight: 8,800 lb (4,000 kg)
  • Max takeoff weight: 10,700 lb (4,900 kg)
  • Powerplant: 1× Allison V-1710-117 liquid-cooled V-12, 1,800 hp (1,340 kW)
Performance
Armament
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