The B-45 began development in 1944, when the War Department, alarmed by German jet bombers like the Arado Ar 234, called for a new family of jet bombers grossing between 80,000 lb (36,287 kg) and 200,000 lb (90,718 kg). The North American proposal (NA-130) won, and on September 8, 1944, the company began production of three prototypes based on the NA-130.
The end of World War II resulted in the cancellation of many projects and delayed many others. In 1946, rising tensions with the Soviet Union caused the Air Force to assign higher priorities to jet bomber development and production. By mid-1946, the XB-45 and Convair XB-46 neared completion, but the XB-47 and Martin XB-48 were still two years away. The USAAF chose to evaluate the first two designs to determine which would be superior operationally. The B-45 proved a superior design, and on January 2, 1947, a contract for immediate production of B-45As was signed. It had been planned to equip five light bomb groups and three light reconnaissance groups with B-45As but as the B-47's development and flight testing made future production all but certain, the B-45's future became increasingly uncertain and in mid 1948 the Air Staff actually began to question the B-45's value. Soon afterwards, President Truman's budget restraints reduced Air Force expenditure and B-45 production was reduced to total of 142 airframes. Further budget cuts in the FY 1950 forced the Aircraft and Weapons Board to cancel 51 of the 190 aircraft on order.
General characteristics
- Crew: 4 (Pilot, Co-Pilot, Bombardier-Navigator and Tail Gunner)
- Length: 75 ft 4 in (22.9 m)
- Wingspan: 89 ft 0 in (27.1 m)
- Height: 25 ft 2 in (7.7 m)
- Wing area: 1,125 ft² (105 m²)
- Empty weight: 45,694 lb (20,726 kg)
- Loaded weight: 81,418 lb (36,930 kg)
- Max takeoff weight: 110,000 lb (50,000 kg)
- Powerplant: 4 × General Electric J47-GE-13 turbojets, 5,200 lbf (25 kN) each
Performance
- Maximum speed: 570 mph (500 kn, 920 km/h)
- Range: 1,000 mi (870 nmi, 1,600 km)
- Service ceiling: 46,400 ft (14,100 m)
- Rate of climb: 5,950 ft/min (1,810 m/min)
- Wing loading: 72.37 lb/ft² (353.4 kg/m²)
- Thrust/weight: 0.26
Armament
- Guns: 2 × .50 in (12.7 mm) M3 machine guns
- Bombs: 22,000 lb (10,000 kg)
