North American XB-70 Valkyrie

The North American Aviation XB-70 Valkyrie was the prototype version of the planned B-70 nuclear-armed, deep-penetration supersonic strategic bomber for the United States Air Force Strategic Air Command.

Designed in the late 60s, the 6 engine Valkyrie was capable of cruising for thousands of miles at Mach 3+ while flying at 70,000 feet (21,000 m).

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.

Specifications

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 take-off 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.

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