Orbital Sciences Corp. could accelerate a plan to re-engine the Antares main stage engine if the cause of an Oct. 28 launch failure is attributed to the rocket’s twin AJ-26 engines. Based on NK-33 powerplants developed by Russia’s Kuznetsov Design Bureau in the 1990s, the AJ-26 is a LOX/kerosene propulsion system developed specifically for the Antares launcher by Aerojet Rocketdyne of Sacramento, California.  But with a dwindling supply of the engines in U.S. inventory, ...


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