Encyclopedia Astronautica
X-15A-2 Tanks


Lox/Ammonia rocket stage. Mass 7,026 kg (15,490 lb).

Cost $ : 2.500 million. No Engines: 0.

Status: Out of production.
Gross mass: 7,026 kg (15,489 lb).
Unfuelled mass: 902 kg (1,988 lb).
Height: 6.86 m (22.50 ft).
Diameter: 0.98 m (3.21 ft).
Span: 0.98 m (3.21 ft).
Specific impulse: 276 s.
Specific impulse sea level: 239 s.
Burn time: 55 s.
Number: 92 .

More... - Chronology...


Associated Countries
Associated Engines
  • None Indicates that the stage shown is a propellant tank. The engine on another stage is drawing propellants from this tank. Performance shown is for that of the engine on the other stage. First flight 1964. More...

Associated Launch Vehicles
  • X-15A-2 American air-launched rocketplane. Manned hypersonic research rocket aircraft. Stretched rebuild of crashed X-15A, with drop tanks. Reached Mach 6.7 and 108 km altitude. More...

Associated Propellants
  • Lox/Ammonia Liquid oxygen was the earliest, cheapest, safest, and eventually the preferred oxidiser for large space launchers. Its main drawback is that it is moderately cryogenic, and therefore not suitable for military uses where storage of the fuelled missile and quick launch are required. Ammonia (NH3) is a colourless gas and liquid with a strong irritating characteristic odour. More...

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