Encyclopedia Astronautica
AJ10-118K


Aerojet N2O4/Aerozine-50 rocket engine. 43.4 kN. Isp=321s. Pressure-fed engine, optimized for altitude operation, used in Delta K stage from 1989. Not regeneratively cooled; used a rubber modified silica phenolic ablative at the combustion flame front.

A pressure-fed engine, optimized for altitude operation. First Flown: August 1982, Delta 164. Mounting: fixed. Engine Cycle: pressure-fed. Oxidizer: nitrogen tetroxide at 9.1 kg/sec. Fuel: Aerozine-50 at 4.76 kg/sec. Mixture Ratio: 1.9:1. Thrust: 43.38 kN vacuum. Isp: 320.5 sec vacuum. Expansion Rate: 65:1. Combustion Chamber Pressure: 8.84 atm. Cooling Method: ablative chamber, radiative skirt. Burn Time: qualified up to 500 sec (unlimited starts). The engine produced approx. 212-213 seconds of Isp when tested with a 1:1 nozzle at sea level for acceptance testing. The engine is not regeneratively cooled. It uses an ablative made from rubber modified silica phenolic at the combustion flame front.

Engine: 98 kg (216 lb). Chamber Pressure: 8.96 bar. Area Ratio: 65. Thrust to Weight Ratio: 43.7040816326531. Coefficient of Thrust vacuum: 5.27806773740639.

Unfuelled mass: 98 kg (216 lb).
Diameter: 1.70 m (5.50 ft).
Thrust: 43.40 kN (9,757 lbf).
Specific impulse: 321 s.
Burn time: 444 s.
Number: 127 .

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Associated Countries
See also
Associated Launch Vehicles
  • Delta 2 7000 American orbital launch vehicle. The Delta 7000 series used GEM-40 strap-ons with the Extra Extended Long Tank core, further upgraded with the RS-27A engine. More...
  • Delta 4000 American orbital launch vehicle. The Delta 4000 series used more powerful Castor 4A strap-ons, but the old Extended Long Tank core with MB-3 engine. Only two of these were launched. More...
  • Delta 5000 American orbital launch vehicle. The Delta 5000 series used the more powerful Castor 4A strap-ons but with the Extended Long Tank core with RS-27 engine. Only one was launched. More...
  • Delta 2 6000 American orbital launch vehicle. The Delta 6000 series used the Castor 4A strap-ons with the ultimate Extra Extended Long Tank core with RS-27 engine. More...
  • Delta 3000 American orbital launch vehicle. The Delta 3000 series upgraded the boosters to Castor 4 solid propellant strap-ons, while retaining the Extended Long Tank core with RS-27 engine. The 3910 series used the TRW Lunar Module engine in the second stage, while the 3920 series reintroduced the Aerojet AJ110 Delta engine. More...
  • Delta IV Small American orbital launch vehicle. Light launch vehicle using the Delta-4 core with the traditional Delta K and PAM-D upper stages. 2 m diameter payload fairing. Not flown as of 2008 but cancellation of the Delta II could lead to its eventual use. More...

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

Associated Propellants
  • N2O4/Aerozine-50 Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Aerozine was a 50-50 mixture of hydrazine and UDMH developed for use in the Titan 2 missile. Copied in one Russian missile but otherwise straight UDMH used more commonly. Higher boiling point than UDMH. More...

Associated Stages
  • Delta K N2O4/Aerozine-50 propellant rocket stage. Loaded/empty mass 6,954/950 kg. Thrust 43.63 kN. Vacuum specific impulse 319 seconds. More...

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