Encyclopedia Astronautica

Design announced on 3 October 2000 for a new cryogenic upper-stage engine aimed at the very large commercial spacecraft market.

Aerojet (USA) announced plans on 3 October 2000 to develop a new cryogenic upper-stage engine, the AJ-60C, aimed at the very large commercial spacecraft market that is expected to develop. The engine, which could be ready for operational use by 2005 according to Aerojet, would produce 245-280 kN of thrust at a specific impulse of 470 seconds for total run times of 4,000 seconds. It would be throttlable to 25% of maximum thrust and capable of up to 25 restarts. Used in a new upper stage for the Delta-4, Atlas-5, or Ariane-5, it would enable the launch of payloads weighing 11,000 kg into a geosynchronous transfer orbit.

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