North American XB-70 Valkyrie

Specifications

1st Flight 1964

Crew: 2

Length: 185 ft 0 in (56.39 m)

Wingspan: 105 ft 0 in (32.00 m)

Height: 30 ft 0 in (9.14 m)

Wing area: 6,297 sq ft (585.0 m2)

Airfoil: Hexagonal; 0.30 Hex modified root, 0.70 Hex modified tip

Empty weight: 253,600 lb (115,031 kg)

Gross weight: 534,700 lb (242,536 kg)

Max takeoff weight: 542,000 lb (245,847 kg)

Fuel capacity: 300,000 pounds (140,000 kg) / 46,745 US gal (38,923 imp gal; 176,950 l)

Powerplant: 6 × General Electric YJ93-GE-3 afterburning turbojet, 19,900 lbf (89 kN) thrust each dry, 28,000 lbf (120 kN) with afterburner

Performance

Maximum speed: 1,787 kn (2,056 mph, 3,310 km/h)

Maximum speed: Mach 3.1

Cruise speed: 1,738 kn (2,000 mph, 3,219 km/h)

Combat range: 3,725 nmi (4,287 mi, 6,899 km)

Service ceiling: 77,350 ft (23,580 m)

Lift-to-drag: about 6 at Mach 2

Wing loading: 84.93 lb/sq ft (414.7 kg/m2)

Thrust/weight: 0.314

Variants

XB-70A

Prototype of B-70, Two were built.

AV-1, NAA Model Number NA-278, USAF S/N 62-0001, completed 83 flights spanning 160 hours and 16 minutes.

AV-2, NAA Model Number NA-278, USAF S/N 62-0207, flew 46 times over 92 hours and 22 minutes, before it crashed in June 1966.

XB-70B

AV-3, NAA Model Number NA-274, USAF S/N 62-0208, was originally to be the first YB-70A in March 1961.

This advanced prototype was cancelled during early manufacture.

YB-70

Planned preproduction version with improvements based on XB-70s.

B-70A

Planned bomber production version of Valkyrie.

A fleet of up to 65 operational bombers was planned.

RS-70

Proposed reconnaissance-strike version with a crew of four and in-flight refuelling capability.

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