Encyclopedia Astronautica
XB-70


Mach 3 rocket launch aircraft. Loaded/empty mass 226,758/68,027 kg. Thrust 520.32 kN. Specific impulse 2084 seconds. N. American Bomber-delta wing. Maximum release conditions: Piggy-back, 27,273 kg (19.1 m length x 6.7 m span) at 3,193 kph at 21,341 m altitude

Cost $ : 81.100 million. No Engines: 6. Release velocity: 890 m/s (2,910 ft/sec). Release altitude: 21 m (70 ft). Release angle: 0 deg. Release conditions: 3,193 kph at 21.3 km.

Location: 890.
Status: Out of Production.
Gross mass: 226,758 kg (499,915 lb).
Unfuelled mass: 68,027 kg (149,973 lb).
Payload: 27,273 kg (60,126 lb).
Height: 56.40 m (185.00 ft).
Diameter: 9.14 m (29.98 ft).
Span: 32.01 m (105.01 ft).
Thrust: 520.32 kN (116,973 lbf).
Specific impulse: 2,084 s.
Specific impulse sea level: 1,894 s.
Burn time: 11,000 s.

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Associated Countries
Associated Engines
  • J93-3 GE turbojet engine. 86.7 kN. Out of Production. Thrust is maximum sea level thrust; specific impulse is sea level value at that thrust. Isp=2084s. More...

Associated Propellants
  • Air/Kerosene Ambient air (78 % nitrogen, 21% oxygen, etc.) is scooped up by air intakes and used in turbojet, turbofan, ramjet, scramjet, or other airbreathing engines. It is used to burn aviation-grade kerosene, commercial grade JP-4 or JP-5, their military equivalents, or special high-temperature blends such as those used in the SR-71. More...

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