UK steps up, as ESA commit to ATV Service Module on NASA's Orion

[saundby]

Did RS-72 ever finish development? If so, that seems like it should be a strong contender. Same propellants as AJ10-190, but twice the thrust and a 24 second ISP increase, could substantially improve performance. Its a gas generator engine though, which could affect safety.

Uprated OMS completed development at Aerojet, flight hardware was constructed and qualified and accepted, but never integrated into STS. So far as I know, there are several shipsets of these engines sitting on shelves. I believe five pairs were completed.

[hektor]

You mean these ones ?

[russianhalo117]

Did RS-72 ever finish development? If so, that seems like it should be a strong contender. Same propellants as AJ10-190, but twice the thrust and a 24 second ISP increase, could substantially improve performance. Its a gas generator engine though, which could affect safety.

Uprated OMS completed development at Aerojet, flight hardware was constructed and qualified and accepted, but never integrated into STS. So far as I know, there are several shipsets of these engines sitting on shelves. I believe five pairs were completed.

All Shuttle programme OMS engines were transferred to SLS programme and the one that will be tested in the propulsion article above is an AJ10 that flew on shuttle.

Source: http://www.rocket.com/orion-main-engine

Aerojet Rocketdyne is supporting refurbishment of Shuttle OMS-E engines for use as the Orion Main Engine (OME) during the Exploration Mission-1 flight. The refurbished Shuttle engines will provide 6,000 lbf of thrust to support major in-space maneuvers of the Orion spacecraft.

[russianhalo117]

You mean these ones ?

No,
OMS-E BPE's produce 6,000 lbf of thrust and the derated derivative in the article produces only 4,000 lbf of thrust.
OEM Source: http://www.rocket.com/orion-main-engine and http://www.rocket.com/space-shuttle-oms-engines