How much of the work done on J2X would be applicable to RS-25E?If a lot, then maybe this work is more of "placeholder" work until RS-25E is needed. And the money spent here is money that won't need to be spent developing RS-25E.If not much, then this seems like a bit of a dead end of NASA goes with the DUUS for SLS.
William Greene's latest post: http://blogs.nasa.gov/cm/blog/J2X/posts/post_1371567316576.html
Quote from: russianhalo117 on 06/19/2013 07:33 pmWilliam Greene's latest post: http://blogs.nasa.gov/cm/blog/J2X/posts/post_1371567316576.html[...]Interesting in that, sounds like they are working on an engine controller that will work on any engine, past, present, or future. I could see that being handy if SLS were to go with F-1B boosters. It might transfer over to RS-68 as well, to keep the cost down a bit by having one universally compatable controller. If I am reading that right anyway.
Quote from: Lobo on 06/20/2013 12:29 amQuote from: russianhalo117 on 06/19/2013 07:33 pmWilliam Greene's latest post: http://blogs.nasa.gov/cm/blog/J2X/posts/post_1371567316576.html[...]Interesting in that, sounds like they are working on an engine controller that will work on any engine, past, present, or future. I could see that being handy if SLS were to go with F-1B boosters. It might transfer over to RS-68 as well, to keep the cost down a bit by having one universally compatable controller. If I am reading that right anyway.Yes, the controller may be useful for other engines - see this post of a short NASA article in the SLS thread:http://forum.nasaspaceflight.com/index.php?topic=26853.msg969747#msg969747
As an accompaniment to the above video, William D Greene has also posted his latest blog giving his first-hand experiences of witnessing large engine tests. Brilliantly written, worth reading!http://blogs.nasa.gov/J2X/2013/07/16/j-2x-progress-shaking-up-the-night/
Quote from: AnalogMan on 07/17/2013 09:18 amAs an accompaniment to the above video, William D Greene has also posted his latest blog giving his first-hand experiences of witnessing large engine tests. Brilliantly written, worth reading!http://blogs.nasa.gov/J2X/2013/07/16/j-2x-progress-shaking-up-the-night/Is anyone else having problems with the RSS feed for this blog?Unfortunately, this coincides with both the transition of this blog to the new NASA look, and the death of Google Reader (so now I'm using Feedly).The transition to Feedly carried across saved posts, but has not picked up this new blog item.I can't find an RSS subscription link on the blog page, so I'm wondering if NASA have given up on providing RSS feeds for this?cheers, Martin
Quote from: MP99 on 07/17/2013 11:49 amQuote from: AnalogMan on 07/17/2013 09:18 amAs an accompaniment to the above video, William D Greene has also posted his latest blog giving his first-hand experiences of witnessing large engine tests. Brilliantly written, worth reading!http://blogs.nasa.gov/J2X/2013/07/16/j-2x-progress-shaking-up-the-night/Is anyone else having problems with the RSS feed for this blog?Unfortunately, this coincides with both the transition of this blog to the new NASA look, and the death of Google Reader (so now I'm using Feedly).The transition to Feedly carried across saved posts, but has not picked up this new blog item.I can't find an RSS subscription link on the blog page, so I'm wondering if NASA have given up on providing RSS feeds for this?cheers, MartinWith the recent update and rearrangement of NASA web sites I've also found quite a few of my favorite links no longer work and I've had to search out the replacements.For the J-2X blog try this link:http://blogs.nasa.gov/J2X/feed/
Cool. Thanks for that.Other than the controller, I wonder how much actual hardware development will be applicable to RS-25E?Obviously putting together a team that can develop a hydrolox engine will have been done. And I'd assume if J2X doesn't go into production for a J2X upper stage for SLS, that "production space" would be used for RS-25E. With much of the fabrication machinery just needing to be adjusted to produce hardware for RS-25E from J2S?Will any of the existing RS-68 production space/equipment/personnel be applicable to RS-25E as well?
The MB60 thread brought me back to this. Shoot me for being late to the game on this question which I am sure has been covered extensively... at this stage in the game, what is the purpose of the J2-X? Are we reasonably sure it won't see the light of day for quite some time, as the favored engine at this point is of the RL10/60 class? If Ares V was going to have such high booster and first stage performance as SLS, why was it even considered to begin with? Just for commonality as it was needed for Ares I?Is development continuing to fulfill the CxP contract with Rocketdyne and to keep the Liquid Propulsion team on the ball prior to transition to RS-25?Thanks
Quote from: Lobo on 06/20/2013 05:24 pmCool. Thanks for that.Other than the controller, I wonder how much actual hardware development will be applicable to RS-25E?Obviously putting together a team that can develop a hydrolox engine will have been done. And I'd assume if J2X doesn't go into production for a J2X upper stage for SLS, that "production space" would be used for RS-25E. With much of the fabrication machinery just needing to be adjusted to produce hardware for RS-25E from J2S?Will any of the existing RS-68 production space/equipment/personnel be applicable to RS-25E as well?The same tools, fabrication, and even personnel will be used for the RS-68A, RS-25E, J-2X and RL-10C. Modern machine shop tools are computer controlled, so the same tool which makes parts for one will be easily adapted to work on another. Even the F-1B will take advantage of this modern fabrication technology. The rules of the game have changed my friend. Now, through modern fabrication methods such as 3D printers and CNC, you no longer have to swap a factory around to change the production. You can have both being made at the same time at different points of the assembly chain, in this case.