Quote from: niwax on 12/13/2018 07:30 amNorthrop also tried reusing 30 year old engines. After that Cygnus flew on Atlas for a bit...None of the RS-25D engines that are going to be flown on the SLS are that old.
Northrop also tried reusing 30 year old engines. After that Cygnus flew on Atlas for a bit...
Wonder if any Merlin's come close
Quote from: Arb on 12/12/2018 10:45 pmWonder if any Merlin's come close >SpaceX likes to blow up their test articles by ramping up the conditions >
Part of the Merlin’s qualification testing involves feeding a stainless steel nut into the fuel and oxidizer lines while the engine is running—a test that would destroy most engines but leaves the Merlin running basically unhindered.
ARTICLE: Government MECO delays RS-25 testing following premature shutdown -https://www.nasaspaceflight.com/2019/01/government-meco-rs-25-premature-shutdown/ https://twitter.com/NASASpaceflight/status/1083064629364953088
Quote from: catdlr on 04/05/2019 02:53 amNASA Achieves Testing Milestone with Engines for Initial SLS MissionsNASA conducted a hot fire test of RS-25 flight engine No. 2062 on the A-1 Test Stand at Stennis Space Center on April 4, with a full-duration of 500 seconds. The hot fire caps more than four years of testing for engines that will help power the first four missions of NASA’s new Space Launch System (SLS) rocket. All 16 former space shuttle main engines that will help launch the first four SLS missions have undergone acceptance testing and have completed developmental and acceptance testing for new controllers to be used by the engines. It also concludes a 51-month test series that demonstrated RS-25 engines can perform at the higher power level needed to launch the super heavy-lift SLS rocket.Does this mean the Retrofit 1b test series is complete, and certification of the new HIP MCC, HPFTP and POGO accumulators is now complete (along with the certification of the ECUs for the first four SLS flights)? If so, the next RS-25 testing we can expect is within the Retrofit 2 series, to certify the flexible ducting? How long is that program expected to last before Retrofit 3 is reached? I understand the deadline for finishing all Retrofit series and deliver a non-flight certification engine is the middle of next year, to have six new "production restart" engines delivered 3 years later.
NASA Achieves Testing Milestone with Engines for Initial SLS MissionsNASA conducted a hot fire test of RS-25 flight engine No. 2062 on the A-1 Test Stand at Stennis Space Center on April 4, with a full-duration of 500 seconds. The hot fire caps more than four years of testing for engines that will help power the first four missions of NASA’s new Space Launch System (SLS) rocket. All 16 former space shuttle main engines that will help launch the first four SLS missions have undergone acceptance testing and have completed developmental and acceptance testing for new controllers to be used by the engines. It also concludes a 51-month test series that demonstrated RS-25 engines can perform at the higher power level needed to launch the super heavy-lift SLS rocket.
Quote from: eeergo on 04/09/2019 01:19 pmQuote from: catdlr on 04/05/2019 02:53 amNASA Achieves Testing Milestone with Engines for Initial SLS MissionsNASA conducted a hot fire test of RS-25 flight engine No. 2062 on the A-1 Test Stand at Stennis Space Center on April 4, with a full-duration of 500 seconds. The hot fire caps more than four years of testing for engines that will help power the first four missions of NASA’s new Space Launch System (SLS) rocket. All 16 former space shuttle main engines that will help launch the first four SLS missions have undergone acceptance testing and have completed developmental and acceptance testing for new controllers to be used by the engines. It also concludes a 51-month test series that demonstrated RS-25 engines can perform at the higher power level needed to launch the super heavy-lift SLS rocket.Does this mean the Retrofit 1b test series is complete, and certification of the new HIP MCC, HPFTP and POGO accumulators is now complete (along with the certification of the ECUs for the first four SLS flights)? If so, the next RS-25 testing we can expect is within the Retrofit 2 series, to certify the flexible ducting? How long is that program expected to last before Retrofit 3 is reached? I understand the deadline for finishing all Retrofit series and deliver a non-flight certification engine is the middle of next year, to have six new "production restart" engines delivered 3 years later.Retrofit 1b testing should now be complete with the 9th test. POGO accumulator was on DE-0528 for Retrofit 1a and the same POGO assembly was retrofitted on DE-0525 for Retrofit 1b.Retrofit-2 will use DE-0528 for testing and will include the flex hoses you mentioned, a change from the complicated flex-joints which were used on Shuttle. Going from reusable to expendable plus the reduction in gimbaling requirements allowed for this change. We will see the 2nd MCC and 2nd POGO assemblies along with some gimbaling action using the new thrust vector control (TVC) assembly added to the A-1 test stand.The test scheduling on the restart of RS-25 production seems to be on schedule, I'm guessing we'll see E-0528 loaded with the new parts for Retrofit2 testing soon(Summerish??EDIT possibly next year-AR-22 gets another round of tests in addition to last Summers testing at A-1)).The original 16 "Heritage" engines have now been accepted as "Adaptation Engines" which will run at 109% RPL. Along with the engines 17 new controllers, 4 for each mission, with a single spare controller.The contract delivery date for those six "new build" engines is July of 2024. The single "Certification Engine" as they are calling it, is really a Development Engine, regardless it will have all the features of a flight engine, but will never see space. We are to see the new build "Certification Engine" by mid 2021.pics1) Testing/Development/Production restart for RS-25 engine program2) Differences between "Heritage(RS-25D/SSME)" "Adaptation" and "Restart" SR25 engines
In the imperial system maybe, but not in the metric system.