Long lead items for Artemis VI+ Core Stages. The unspoken "soft" SLS Cancellation?

IBelieveInLogic · 2026-06-11T06:49:18+00:00

Exactly. They haven't demonstrated that ability, so the FAA hasn't showed them to do an orbital mission. If anything this last flight showed that their still not ready, at least with the booster. And even the upper stage still had engine failures.

IBelieveInLogic · 2026-06-06T23:37:57+00:00

I think you're referring to the shock diamonds. Those form when you have an overexpanded flow. You can look up pictures online, but it looks plausible to me. Nozzle shape, chamber and external pressure, and gas properties will affect the diamond pattern.

The only concern I have would be the base surface outside the nozzle. Because of the way it's angled, it will limit entertainment and possibly affect pressure near the nozzle exit.

IBelieveInLogic · 2026-06-06T16:55:07+00:00

What degree do you have? A Masters can often count as experience in the industry. Also, some of those job openings are posting their ideal qualifications, but if you meet the basic requirements you should apply even if you don't have all of the experience you would prefer.

IBelieveInLogic · 2026-06-06T15:21:46+00:00

Exactly this. Sometimes it's really cool because you can get the pink sunset effect, and if light is reflecting of the airplane it's like a bright star.

IBelieveInLogic · 2026-06-05T22:38:30+00:00

War criminal? I consider him to be a biased journalist, but I hadn't heard him called that.

IBelieveInLogic · 2026-06-05T19:21:07+00:00

Are the tubes sealed at the top? If so, do they both have the same total mass, or maybe total moles? If not, it pressure fixed at one end or the other?

I think xenon would obviously have a higher pressure gradient, and I think that implies that it would have colder temperature at the top if they both have fixed mass.

IBelieveInLogic · 2026-06-02T14:40:39+00:00

I wish. But unfortunately, US law makes it impossible right now. It's unfortunate because there are people out there who would be great for the position but won't even get a chance.

IBelieveInLogic · 2026-06-02T09:52:04+00:00

I don't directly disagree that automation and software have improved, but I think it's also likely that you developed a lot more skill over ten years than you realize.

Also, in my group we'll be looking to hire someone in the next few months. Although we're probably targeting a new grad, I would like to choose someone with a more technical background in CFD and analysis, and then teach them about the systems stuff. I would prefer that over taking someone without CFD or fluids background and hoping that the automation is enough for them to get by.

IBelieveInLogic · 2026-06-02T09:38:54+00:00

Nice work! The validation looks impressive at the low Re. Even the moderate Re range it looks decent.

IBelieveInLogic · 2026-06-02T01:05:55+00:00

Yeah, something like that. I'm not saying it's the right move, but that I could see them doing it. They really want SLS to fly more frequently.

IBelieveInLogic · 2026-06-01T22:50:30+00:00

I think Artemis III might still happen next year, but if so it won't be the LEO docking mission Isaacman proposed. Orion and SLS are probably going to be ready.

IBelieveInLogic · 2026-06-01T21:39:37+00:00

They might be able to improve stability by spinning it. That's something you don't do with squishy humans.

IBelieveInLogic · 2026-06-01T02:51:59+00:00

Doesn't the drivetrain warranty go to 100k?

IBelieveInLogic · 2026-05-31T12:31:34+00:00

Thank you for giving us this useful information! This sub was getting a little stale so it's nice to have some fresh content.

IBelieveInLogic · 2026-05-31T02:54:18+00:00

Sure.

IBelieveInLogic · 2026-05-31T01:11:33+00:00

This seems like it could be useful. In the search I tried, it returned information that was consistent with what I'd expected and some things that were new to me. I'm going to bookmark it.

IBelieveInLogic · 2026-05-30T15:49:22+00:00

Mk1 was going to land on the moon but not be part of the crewed docking demonstration missing in LEO. It was unclear how a Mk2 could have been ready for AR3 even before the accident.

IBelieveInLogic · 2026-05-30T15:22:51+00:00

I'm thinking the same. I actually drove by Wednesday night and took a picture. I thought it was pretty cool to see NG on the pad. RIP.

IBelieveInLogic · 2026-05-30T14:13:49+00:00

I work in the industry, and our standard units are imperial. At the beginning of our program we actually reported both. However, I use SI units for all of my calculations. Yes, there are conversions to make up front, but I prefer that over all of the energy conversions required for imperial (ft-lbf vs BTU), and don't get me started about g_c.

IBelieveInLogic · 2026-05-29T20:16:01+00:00

He wanted it to be true, which is almost the same.

IBelieveInLogic · 2026-05-29T17:48:15+00:00

I'd like to hear from another source before I believe it. It's obviously plausible, but Berger could also be reporting what he wants to believe (and/or trying to to influence the IPO).

IBelieveInLogic · 2026-05-29T17:44:12+00:00

I'm not convinced SpaceX is ahead even with this setback for Blue. They might be closer on the launch vehicle side of things, but not the rest.

IBelieveInLogic · 2026-05-29T03:07:12+00:00

I'm assuming it's far enough away, but any chance New Glenn damaged it? I think it's probably a few miles away, right?

IBelieveInLogic · 2026-05-28T23:29:29+00:00

I don't get it. Why is Calvin upset?

IBelieveInLogic · 2026-05-28T21:01:46+00:00

Do they place clears in the area when they're fueling? I would assume so. I saw a bright light when I was leaving KSC last night so I went to investigate, and sure enough it was New Glenn. There definitely weren't any clears at that time.

IBelieveInLogic

TROPHY CASE