Encyclopedia Astronautica

Lox/Ammonia propellant rocket stage. Loaded/empty mass 16,069/7,766 kg. Thrust 262.45 kN. Vacuum specific impulse 276 seconds.

Cost $ : 100.000 million.

Status: Out of production.
Gross mass: 16,069 kg (35,426 lb).
Unfuelled mass: 7,766 kg (17,121 lb).
Height: 15.47 m (50.75 ft).
Diameter: 1.42 m (4.65 ft).
Span: 6.80 m (22.30 ft).
Thrust: 262.45 kN (59,000 lbf).
Specific impulse: 276 s.
Specific impulse sea level: 239 s.
Burn time: 90 s.
Number: 46 .

More... - Chronology...

Associated Countries
Associated Engines
  • XLR99 Thiokol Lox/Ammonia rocket engine. 262.4 kN. Out of production. Isp=276s. The first large, man-rated, throttleable, restartable liquid propellant rocket engine, boosted the X-15A. First flight 1959. 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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