Any idea when ME-0525 will break its 5 year silence since its last firing in 2009?
My understanding is that the existing RS-25D engines will be flown at 109%. The new RS-25E engines will be flown at 111%. From page 25 of the attached document. The RS-25D has been certified at 109% and also ground tested at 111%.
So.. what they're saying is.. ours go to 11?
Quote from: QuantumG on 08/27/2014 08:07 am So.. what they're saying is.. ours go to 11?Although RS-25D has been tested at 111%, that does not mean that it is certified for 111% which I believe requires additional testing or modifications to the engine.
I understood that the RS-25E would be a simplified design using modern manufacturing techniques, and a considerably reduced part count. So where does the extra ~300 lbs for the new engine come from?Is the new channel-wall nozzle that much heavier than the legacy tube-wall version?
Things should be getting ready to fire shortly, Anyone heard anything?
regarding the new SSME controller - 'if it ain't broke, don't fix it'
IIRC the new RS-25 controller and the new J2X controller are one in the same. So Block II SLS will use a common controller on bothe the core and the upper stage.
Quote from: Hog on 12/21/2014 04:23 pmIIRC the new RS-25 controller and the new J2X controller are one in the same. So Block II SLS will use a common controller on bothe the core and the upper stage.Unlikely. SLS, as currently envisioned up to the 130 mT version, will never fly J-2X on any upper stage.