Encyclopedia Astronautica

Aerojet Nitric acid/Amine rocket engine. XP-79 Launch thrust .882 kN. Development begun January 1943. Planned successor to XCALT-6000, developed under 'Project X' for the Northrop XP-79 Flying Wing rocket fighter. First flight 1945.

Two different engines were developed. Low thrust, proof of principle First US rocket powered aircraft flight. Also called XCAL-200

Application: XP-79 Northrop Flying Wing.


Thrust (sl): 882 N (198 lbf). Thrust (sl): 90 kgf. Propellant Formulation: RFNA/Monoethylaniline.

AKA: XCAL-200.
Thrust: 882 N (198 lbf).
First Launch: January 1943.

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Associated Countries
Associated Spacecraft
  • XP-79 American manned rocketplane. Flown in 1945. The XP-79 was Jack Northrop's design for a rocket-propelled flying wing fighter. More...

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

Associated Propellants
  • Nitric acid/Amine 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. Early storable rocket systems sought to improve ignition characteristics and perforamance by eliminating the kerosene portion of the fuel. An amine is an organic compound produced when one or more hydrogen atoms of ammonia is replaced with organic groups. Mixed amine fuels were first developed by the Germans in World War II. TONKA-250, developed for the Wasserfall rocket, was used by the Russians after the war in various engines under the specification TG-02. More...

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