Any idea why Williams Greene hasn't updated his J-2X blog recently ? Is he that busy with work, or has he moved onto another project ?
Just a general question concerning the gimbling hydraulics. I realize that they need an independent power source, because their motion is exercised prior to ignition. Is it helium pressure that they use, some kind of electric pump, or something else? How long does their power output last?
Hot-fire Tests Steering the Future of NASA's Space Launch System EnginesApril 22, 2013...The March 7 test, which set the short-lived duration record, was remarkable for another reason in that it marked the first time a 3-D printed part was hot-fire tested on a NASA engine system.The prime contractor for the liquid engine, Pratt & Whitney Rocketdyne of Canoga Park, Calif., built a maintenance port cover for the 10002 engine using an advanced manufacturing process called Selective Laser Melting. This construction method uses lasers to fuse metal dust into a specific pattern to build the needed part....http://www.nasa.gov/exploration/systems/sls/j2x/j2x_a2.html
Quote from: AnalogMan on 04/23/2013 12:41 amHot-fire Tests Steering the Future of NASA's Space Launch System EnginesApril 22, 2013...The March 7 test, which set the short-lived duration record, was remarkable for another reason in that it marked the first time a 3-D printed part was hot-fire tested on a NASA engine system.The prime contractor for the liquid engine, Pratt & Whitney Rocketdyne of Canoga Park, Calif., built a maintenance port cover for the 10002 engine using an advanced manufacturing process called Selective Laser Melting. This construction method uses lasers to fuse metal dust into a specific pattern to build the needed part....http://www.nasa.gov/exploration/systems/sls/j2x/j2x_a2.htmlhttp://www.nasa.gov/multimedia/videogallery/index.html?media_id=161836271at 1:50 >>> back in 2011 we've built a duct using this process, for the J-2X, and we hot-fired it ...<<<So which 3-D printed item was first hot-fire tested for J-2X: the U-duct or the maintenance port cover ?!
Hot-fire Tests Steering the Future of NASA's Space Launch System EnginesApril 22, 2013Engineers 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.The J-2X will drive the second stage of the 143-ton (130-metric ton) heavy-lift version of the Space Launch System (SLS). The rocket will provide an entirely new capability for human exploration and send humans in NASA's Orion spacecraft into deep space.J-2X engine 10002 was fired for the last time on the A-2 test stand at Stennis on April 17. This engine set a duration record for J-2X engine firings at Stennis' A-2 test stand on April 4 when it fired for 570 seconds, beating the previous mark set less than a month earlier on March 7, when the same engine ran for 560 seconds.This is the second J-2X engine Stennis has test fired. Last year, test conductors put the first developmental J-2X engine, called 10001, through its paces. According to J-2X managers, both performed extremely well.When the engine is eventually used in space, it will need to be able to move to help steer the rocket."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."The March 7 test, which set the short-lived duration record, was remarkable for another reason in that it marked the first time a 3-D printed part was hot-fire tested on a NASA engine system.The prime contractor for the liquid engine, Pratt & Whitney Rocketdyne of Canoga Park, Calif., built a maintenance port cover for the 10002 engine using an advanced manufacturing process called Selective Laser Melting. This construction method uses lasers to fuse metal dust into a specific pattern to build the needed part."This demonstrates affordable manufacturing in a revolutionary way," Kynard said. "The maintenance port cover built with Selective Laser Melting cost only 35 percent of the cost to make the same part using traditional methods. It performed well enough that we have started building other rocket engine parts using this advanced process, which takes days instead of months. It is a significant savings and one that we’ll take advantage of when we build engine parts in the future."The SLS will first launch during Exploration Mission-1 in 2017, a flight test that will send an uncrewed Orion spacecraft around the moon.http://www.nasa.gov/exploration/systems/sls/j2x/j2x_a2.html
Any idea why Williams Greene hasn't updated his J-2X blog recently ? Is he that busy with work, or has he moved onto another project?
Quote10 On May 01, 2013 11:37:38 AM RH117 added a comment on your blog post. Is this blog dead or will this be updated soon since a lot of progress has occurred since this last post was added on 08 January 2013. A new update bringing the public up to date on the latest progress over the last and current quarters of the fiscal year would be nice for a change.11 On May 02, 2013 10:54:40 AM Kris Rainey added a comment on your blog post. Hi RH117 - We appreciate your interest in this blog because there are a number of exciting things happening. Bill is currently in the process of completing his next post that will talk about the expansion of the office from strictly J-2X to liquid rocket engines in general and RS-25 in specific. His future posts will also cover upcoming liquid rocket engine testing by private industry at various NASA centers of prospective liquid rocket engines that competing in the liquid category for final selection by NASA to manufacture advanced boosters for NASA's Space Launch System. Stay tuned!Thanks
10 On May 01, 2013 11:37:38 AM RH117 added a comment on your blog post. Is this blog dead or will this be updated soon since a lot of progress has occurred since this last post was added on 08 January 2013. A new update bringing the public up to date on the latest progress over the last and current quarters of the fiscal year would be nice for a change.
Quote from: Lurker Steve on 04/23/2013 01:43 pmAny idea why Williams Greene hasn't updated his J-2X blog recently ? Is he that busy with work, or has he moved onto another project?Here is the answer that you were looking for. Below is a copy my comment and the received reply on his last blog post:QuoteQuote10 On May 01, 2013 11:37:38 AM RH117 added a comment on your blog post. Is this blog dead or will this be updated soon since a lot of progress has occurred since this last post was added on 08 January 2013. A new update bringing the public up to date on the latest progress over the last and current quarters of the fiscal year would be nice for a change.11 On May 02, 2013 10:54:40 AM Kris Rainey added a comment on your blog post. Hi RH117 - We appreciate your interest in this blog because there are a number of exciting things happening. Bill is currently in the process of completing his next post that will talk about the expansion of the office from strictly J-2X to liquid rocket engines in general and RS-25 in specific. His future posts will also cover upcoming liquid rocket engine testing by private industry at various NASA centers of prospective liquid rocket engines that competing in the liquid category for final selection by NASA to manufacture advanced boosters for NASA's Space Launch System. Stay tuned!ThanksHere is the answer that you were looking for. Above is a copy my comment and the received reply on his last blog post.
Quote from: russianhalo117 on 05/02/2013 08:32 pmQuote from: Lurker Steve on 04/23/2013 01:43 pmAny idea why Williams Greene hasn't updated his J-2X blog recently ? Is he that busy with work, or has he moved onto another project?Here is the answer that you were looking for. Below is a copy my comment and the received reply on his last blog post:QuoteQuote10 On May 01, 2013 11:37:38 AM RH117 added a comment on your blog post. Is this blog dead or will this be updated soon since a lot of progress has occurred since this last post was added on 08 January 2013. A new update bringing the public up to date on the latest progress over the last and current quarters of the fiscal year would be nice for a change.11 On May 02, 2013 10:54:40 AM Kris Rainey added a comment on your blog post. Hi RH117 - We appreciate your interest in this blog because there are a number of exciting things happening. Bill is currently in the process of completing his next post that will talk about the expansion of the office from strictly J-2X to liquid rocket engines in general and RS-25 in specific. His future posts will also cover upcoming liquid rocket engine testing by private industry at various NASA centers of prospective liquid rocket engines that competing in the liquid category for final selection by NASA to manufacture advanced boosters for NASA's Space Launch System. Stay tuned!ThanksHere is the answer that you were looking for. Above is a copy my comment and the received reply on his last blog post."And RS-25 in specific."... That blog is looking to get a whole lot more interesting. And it already was most interesting. Very nice to hear this.
Beautiful, shiny and new. I love liquid rocket engine hardware
" Here are the stats on the six tests: • Test: A2J022 2/15/2013 35 seconds duration • Test: A2J023 2/27/2013 550 seconds duration • Test: A2J024 3/07/2013 560 seconds duration • Test: A2J025 3/19/2013 425 seconds duration • Test: A2J026 4/04/2013 570 seconds duration • Test: A2J027 4/17/2013 16 seconds durationSo the total accumulated time is 2,156 seconds. Tests #22, #25, and #27 all experienced early cuts, but all three were instigated by different flavors of instrumentation or monitoring system issues or oddities. The engine is fine and running well. "
Quote from: robertross on 05/14/2013 11:38 pmBeautiful, shiny and new. I love liquid rocket engine hardware Beautiful and shiny, yes - but not so new now By my reckoning its had a total of 2640 seconds (44 minutes) of running on the A2 test stand (assuming the final test ran its planned duration).