Encyclopedia Astronautica

Aerojet Nitric acid/JP-X rocket engine. 156 kN. SNORT Sled. Development begun early 1950s. 35,000 Ibf thrust, 2-10 second duration. JP-X was a jet fuel / hydrazine mixture.

Application: SNORT Sled.

Propellant Formulation: RFNA/JP-X.

Thrust: 156.00 kN (35,070 lbf).
First Launch: Early 1950s.

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Associated Countries
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Associated Manufacturers and Agencies
  • Aerojet American manufacturer of rockets, spacecraft, and rocket engines. Aerojet, Sacramento, CA, USA. More...

Associated Propellants
  • Nitric acid/JP-X Drawing on the German World War II Wasserfall rocket, nitric acid (HNO3) became the early storable oxidiser of choice for missiles and upper stages of the 1950's. To overcome various problems with its use, it was necessary to combine the nitric acid with N2O4 and passivation compounds. These formulae were considered extremely secret at the time. By the late 1950's it was apparent that N2O4 by itself was a better oxidiser. Therefore nitric acid was almost entirely replaced by pure N2O4 in storable liquid fuel rocket engines developed after 1960. The addition of approximately 40 per cent of UDMH to JP-4 resulted in a formulation (JP-X) which solved both the combustion and the ignition difficulties experienced with WFNA/ JP-4 and IRFNA/JP-4. More...

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