SLS / Orion / Beyond-LEO HSF - Constellation > Heavy Lift Launch Vehicle (HLV/SLS)
SLS Development Stage UPDATE Thread (2)
Chris Bergin:
Thread for updates on the development stage for the Space Launch System.
Main Links of use:
Lots and lots of SLS and HLV (pre-SLS) articles - no other news site has come close to the coverage we've provided for SLS:
http://www.nasaspaceflight.com/tag/hlv/
http://www.nasaspaceflight.com/tag/sls/
L2 Members:
L2: Specific SLS Section (already VERY meaty - presentations, updates, engineering discussion, with actual SLS managers/engineers, videos and photos/graphics):
http://forum.nasaspaceflight.com/index.php?board=48.0
Note: This is a dev update thread. This should not cover policy or opinion (along the lines of the aforementioned. Use the Space Policy section for that). All posts need to be updates.
ChileVerde:
A question about the SLS RS-25s came up in the Mk 1 incarnation of this thread that might relate to a NASA item that just appeared in the J-2X thread:
--- Quote ---http://forum.nasaspaceflight.com/index.php?topic=26853.msg1040482#msg1040482
Re: SLS Development Stage Update Thread
« Reply #678 on: 2013-04-18, 14:56:11 »
From a recent GAO report (http://www.gao.gov/assets/660/653866.pdf page 63):
Quote
[SLS project] officials will not know if the shuttle-era RS-25 engines as currently designed can meet SLS’s performance requirements without significant modifications until the engine preliminary design review.
What are they doing to the SSME that makes its performance uncertain? Are they pushing its throttle level beyond shuttle levels and not sure if that'll work?
--- End quote ---
--- Quote ---http://forum.nasaspaceflight.com/index.php?topic=22010.msg1042504#msg1042504
Re: Live: Testing for the J-2X Upper Stage Engine
« Reply #520 on: 2013-04-22, 18:41:54 »
Hot-fire Tests Steering the Future of NASA's Space Launch System Engines
April 22, 2013
Engineers developing NASA's next-generation rocket closed one chapter of testing with the completion of a J-2X engine test series on the A-2 test stand at the agency's Stennis Space Center in Mississippi and will begin a new chapter of full motion testing on test stand A-1.
<snip>
"The A-1 is designed to allow us to gimbal, or pivot, the J-2X during a live firing and test the range of motion for the engine's flexible parts," said Gary Benton, manager of the J-2X test project at Stennis. "This type of testing hasn’t been performed since the space shuttle main engines were tested on the stand."
Those space shuttle main engines, also called RS-25s, will make a return to the test stand in 2014. A collection of RS-25 engines, which were used to launch 135 space shuttle missions, will be rated to operate at a higher power level and used to launch the core stage of the SLS.
"While we will get valuable data on the engine from the firing and gimbaling of the J-2X, we're also re-testing the function of the A-1 stand," said Mike Kynard, manager of the SLS Liquid Engines Office at NASA's Marshall Space Flight Center in Huntsville, Ala., where the SLS Program is managed. "Using A-1 to work on the J-2X gives us a great opportunity to ensure the stand will be capable and ready to test the RS-25s."
<snip>
--- End quote ---
deltaV:
ChileVerde: thanks for pointing that out. That looks like a good guess as to the answer to my question (that you quoted).
psloss:
As noted elsewhere, NASA has posted the presentation slides from last week's quarterly of the Human Exploration and Operations Committee of the NASA Advisory Council.
The relevant one here is the "Status of Exploration Systems Development (Mr. Daniel Dumbacher)":
http://www.nasa.gov/pdf/742964main_20130418_heoc_dumbacher.pdf
Also posted was a link to a quarterly video:
http://www.nasa.gov/multimedia/videogallery/index.html?media_id=161836271
(This has been running on NASA TV during programming breaks; saw a part of it after the Antares launch, but missed the relevant bit here which is the current target to deliver the 1st core stage from MAF in May, 2016...I assume it would be headed for the B-2 test stand at Stennis shown in both Mr. Dumbacher's and Mr. Gerstenmaier's presentation slides.)
Main page for the Human Exploration and Operations Committee of the NAC, with links:
http://www.nasa.gov/directorates/heo/library/nac/index.html
93143:
--- Quote from: GAO report ---In November 2012, NASA produced a preliminary estimate of $7.65 to $8.59 billion for the 70 metric ton version of SLS.
--- End quote ---
Is this a total spend or a remaining spend? It's hard to tell from the document...
Navigation
[0] Message Index
[#] Next page
Go to full version