Encyclopedia Astronautica
XLR20AJ-2


Aerojet Nitric acid/Gasoline rocket engine. Lark. Launch thrust 6.66 kN. Development begun January 1946. Blast turbine, three levels of thrust (600/1000/7500 lbf). Replaced NM Lark.

Application: Lark.

Thrust (sl): 6.660 kN (1,497 lbf). Thrust (sl): 680 kgf. Propellant Formulation: WFNA/Gasoline.

AKA: XLR20-AJ-2.
Thrust: 6.66 kN (1,497 lbf).
First Launch: January 1946.

More... - Chronology...


Associated Countries
See also
Associated Launch Vehicles
  • Lark American surface-to-air missile. Lark missile. More...

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

Associated Propellants
  • Nitric acid/Gasoline 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. Gasoline of various grades were used as fuel in the earliest rocket engines of Goddard and others. Once appropriate blends of kerosene were developed in the United States and Soviet Union, that became the hydrocarbon fuel of choice. More...

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