here is some stuff i got bout it
found it here
http://en.wikipedia.org/wiki/P-61_Black_WidowGeneral characteristics
Crew: 2-3 (pilot, radar operator, optional gunner)
Length: 49 ft 7 in (15.11 m)
Wingspan: 66 ft 0 in (20.12 m)
Height: 14 ft 8 in (4.47 m)
Wing area: 662.36 ft² (61.53 m²)
Empty weight: 23,450 lb (10,637 kg)
Loaded weight: 29,700 lb (13,471 kg)
Max takeoff weight: 36,200 lb (16,420 kg)
Powerplant: 2× Pratt & Whitney R-2800-65 Double Wasp radial engines with water injection, each turning a four-bladed Curtiss Electric propeller 146 in (3.72 m) in diameter, 2,250 hp (1,680 kW) each
Main wheel track: 17 ft 2 in (5.24 m)
Internal fuel capacity: 640 US gal (2,423 L) of AN-F-48 100/130-octane rating gasoline
External fuel capacity: Up to four 165 US gal (625 L) or 310 US gal (1,173 L) tanks under the wings
Oil capacity: 22 US gal (83.3 L) of AN-0-8 oil per engine
Performance
Maximum speed: 318 knots (365 mph, 589 km/h) at 20,000 ft (6,100 m)
Combat range: 530 nm (610 mi, 982 km)
Ferry range: 1,650 nm (1,900 mi, 3,060 km) with four external fuel tanks
Service ceiling: 34,775 ft (10,600 m)
Rate of climb: 2,540 ft/min (12.9 m/s)
Wing loading: 45 lb/ft² (219 kg/m²)
Power/mass: 0.15 hp/lb (25 W/kg)
Time to altitude: 12 min to 20,000 ft (6,100 m)
Armament
4× 20 mm Hispano M2 cannon in ventral fuselage, 200 rounds per gun
4× 0.50 cal (12.7 mm) Browning M2 machine guns in upper turret, 560 rounds per gun
For ground attack, two bombs of up to 1,600 lb (726 kg) each could be carried along with six 5 inch (127 mm) HVAR unguided rockets under the wings. Some aircraft could also carry one 1,000 lb (454 kg) bomb under the fuselage.
Avionics
SCR-720 (AI Mk.X) search radar
SCR-695 tail warning radar