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End of mandate. It is customary for political appointees to submit their resignations when a new Presidential Administration comes in. The oncoming Administration can ask that they stay on until they have nominated a replacement.

Another note: CAPU-2 shut down did not affect the engine shut down sequence. All 4 engines shut down under hydraulic control, which is unlike what would happen with a APU shut down during a shuttle launch (this did happen, on STS-3 when Water Spray Boiler-3 that cools the lubrication oil for...

Post-test media tele-conference scheduled for 5:30 pm EST today, little more than 90 minutes from now:

We have our first post-test update: https://blogs.nasa.gov/artemis/2021/01/19/green-run-update-data-and-inspections-indicate-core-stage-in-good-condition/ "The Space Launch System (SLS) rocket Green Run team has reviewed extensive data and completed preliminary inspections that show the...

The upper stage has flight-history as the Delta Cryogenic Second Stage (DCSS). It just has an 18" stretch of its LH2 tank, everything else is bog standard DCSS equipment.

It will not take a year to be ready for another hot fire. The Green Run campaign was comprised of more than just the hot fire, that was Item#8. The reasons for the longer than planned campaign were the worldwide outbreak of CoViD-19 in March which was then followed by a very active Atlantic...

That's the kind of damage they expect to have to fix even after a successful hot fire. They always budgeted a month for the refurbishment work before getting the stage of the test stand and loaded aboard the barge for the trip to KSC.

I just went back a took a look at the post-cut off views and all the thermal insulation still look good. Even the aluminum tape that covers the conical base of the Engine Section, looks intact.

It isn't. For the STS-55 RSLS Abort, the NASA Test Conductor (NTD) asked the Shuttle Project Engineer (SPE) folks about what caused the RSLS Abort just 15 minutes after the abort had happened amidst the procedures of safing the vehicle. Here's a video which should start at that point. If it...

Post-test briefing on NASA TV in about 2 hours.

Looks about right to me.

Bug found in this release: Disabling 3D sound doesn't actually disable it. I still get 3D positioned sound even with it turned off through SoundConfig. Another issue related to this is that it totally kills the SSME ignition and firing sound in SSU in the cockpit view with 3D sound disabled.

After a short break, I'm back at this. The left PLBD is mostly done, just lacking the radiator support hardware.

I updated the cross-section and PMI parameters with the ones I got from the shipedit runs and they made practically no difference SRB impact points whatsoever. This tells me that our problem is elsewhere.

Anything more doesn't really matter as Orbiter can only address 4 GB being a Win32 application. I have an EVGA GeForce RTX 2070 SUPER with 8 GB of VRAM and only half is visible to Orbiter. We would need an x64 version to be able to address more than 4 GB.

I'm running some basic integration checks on a fully assembled stack mesh using orbitersdk's shipedit tool, and while the X and Z axes mostly check out, the Y axis is very off.

As far as the full stack aerodynamics go, here's what we got right now: 1st stage(SRB+ET+Orbiter): SetCrossSections(_V(668.94, 676.94, 258.97)); SetRotDrag(_V(0.7, 0.1, 0.3)); SetPMI(_V(249.62, 239.97, 67.43)); 2nd stage(ET+Orbiter): SetCrossSections(_V(303.91, 422.33, 153.51))...

Back to the ascent performance stuff. Just for curiosity's sake, I decided to see where our SRB impact points were. After a number of runs, it turns out they're 233 km downrange from KSC. This is around 35 km short of the historical SRB impact points, which were around 270 km downrange. This...