If I recall correctly, only the P-61A and B could be added to AH...
Work on the P-61C proceeded quite slowly at Northrop because of the higher priority of the XB-35 flying wing project. In fact, much of the work on the P-61C was farmed out to Goodyear, which had been a subcontractor for production of Black Widow components. It was not until early 1945 that the first production P-61C-1-NO rolled off the production lines. As promised, the performance was substantially improved in spite of a two-thousand pound increase in empty weight. Maximum speed was 430 mph at 30,000 feet, service ceiling was 41,000 feet, and an altitude of 30,000 feet could be attained in 14.6 minutes.
The P-61C was equipped with perforated fighter airbrakes located both below and above the wing surfaces. These were to provide a means of preventing the pilot from overshooting his target during an intercept. For added fuel capacity, the P-61C was equipped with four underwing pylons (two inboard of the nacelles, two outboard) which could carry four 310-gallon drop tanks.
The first P-61C aircraft was accepted by the USAAF in July of 1945. However, the war in the Pacific ended before any P-61Cs could see combat. The forty-first and last P-61C-1-NO was accepted on January 28, 1946. At least thirteen more were completed by Northrop but were scrapped before they could be delivered to the USAAF. Northrop records show an additional 400 P-61Cs with 1945 serial numbers to have been on order, with blocks 5 and 10 being at least in the planning stages.
P-61A-1 - Initial Production Model; 45 produced; fitted with R-2800-10 engines of 2,000hp; final 7 in series produced sans turret.
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P-61A-5 - Fitted with R-2800-65 engines of 2,250hp; 35 produced; sans turret.
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P-61A-10 - 100 produced; water-injection implemented for improved engine output.
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P-61A-11 - 20 produced; two underwing hardpoints introduced for bomb-carrying capability.
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P-61B-1 - 62 produced; nose lengthened by 8 inches; SCR-695 tail warning radar introduced.
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P-61B-2 - 38 produced; two underwing hardpoints introduced for B-series as in P-61A-11 model.
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P-61B-10 - Underwing hardpoints increased from two to four; 46 units produced.
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P-61B-11 - Turret Implemented but with only two 12.7mm machine guns; 5 production models built.
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P-61B-15 - Turret expanded to 4 x 12.7mm machine guns; 153 produced.
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P-61B-16 - Turret reduced to 2 x 12.7mm machine guns; 6 produced.
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P-61B-20 - New General Electric turret implemented now with the 4 x 12.7mm machine gun array; 84 produced.
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P-61B-25 - APG-1 gun-laying radar introduced for computerized automatic firing of turret; 6 produced.
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P-61C - Fitted with R-2800-73 turbocharged engines of 2,800hp each; improved performance; 41 produced; a further 476 cancelled due to war's end.
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