Encyclopedia Astronautica

Lox/Ammonia propellant rocket stage. Loaded/empty mass 14,184/5,158 kg. Thrust 262.45 kN. Vacuum specific impulse 276 seconds.

Cost $ : 100.000 million.

Status: Retired 1968.
Gross mass: 14,184 kg (31,270 lb).
Unfuelled mass: 5,158 kg (11,371 lb).
Height: 15.32 m (50.26 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: 4 .

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 American air-launched rocketplane. Manned hypersonic research rocket aircraft. 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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