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About Racescort666

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  1. Racescort666

    ULA launch and discussion thread

    @tater that was very interesting. I love hearing Tory Bruno talk about rockets, that dude know his stuff. I know Elon is a bit of a favorite around this forum but Tory knows his product line backwards and forwards. He's also under no illusions that SpaceX does certain things better than ULA but I think they are in a good spot for delivering a lower risk launch vehicle.
  2. Racescort666

    Which Launch?

    You have a typo there, the SSME is the RS-25 which was developed from the HG-3 which was supposed to be a performance improvement over the J-2. The RS-68 was developed as a cost effective engine to be used in expendable launch vehicles thus its use in the DIV. It doesn't really have much in common with the RS-25 other than fuel. Construction is different (channel wall of the RS-68 vs tube wall of the RS-25), the RS-25 is completely regeneration cooled while the RS-68 has an ablatively cooled nozzle, RS-25 is staged combustion while the RS-68 is gas-generator. They maybe incorporated some "lessons learned" from the RS-25 but I wouldn't call that derived from.
  3. Racescort666

    SpaceX Discussion Thread

    I see this frequently as well. It will be fiberglass -> plastic (piece part cost save, yay!) then plastic -> fiberglass (warranty cost save, yay!). Sometimes cost save ideas are really good and/or confusing and sometimes they're not well thought out and end up costing more in the long run. And you're right, sometimes vendor contracts dictate why designs end up being a certain way. I can think of several parts off the top of my head that haven't changed in many years because they're locked in at a contract price that's favorable.
  4. Racescort666


    Something I found interesting from that article: For reference, the Atlas V 411 that OSIRIS-REx launched on was around 55 m tall.
  5. Racescort666

    SpaceX Discussion Thread

    That's a funny looking boat you've got parked there.
  6. Racescort666

    Well, it finally happened...

    You totally have my permission to steal this thread.
  7. Racescort666

    SpaceX Discussion Thread

    Is anyone there in person?
  8. Racescort666

    Well, it finally happened...

    I got busted by my IT department for having games on my work laptop. It wasn’t KSP, although KSP was definitely the first game I put on and the reason I started gaming on my work computer. I went for about 4 years of really solid KSP play throughs. Starting around the time we started issuing CAD laptops to the engineers to run SolidWorks, CATIA, and NX. I ultimately got busted for World of Warships which I forgot to log out of and it ran an update which got flagged by IT. I don’t think I’m actually in trouble, my manager had known about this basically since the beginning. I never played at work anyway so I doubt this is any kind of fireable offense. Plus I told him about it as soon as I got the email from IT and he just said “thanks for the heads up”. So here we are, no more KSP on the work computer and I’ve gotta buy a gaming laptop. Actually, as of this writing, I’ve already ordered one: Dell G3 17” and I’m pumped for it to show up.
  9. Racescort666

    SpaceX Discussion Thread

    I always feel like I'm catching up on it as well. I usually just end up skipping through a few dozen BFR speculation posts and I'm right up to current events. Just look for the tweets which are usually relevant. As for the happy reactions to the delay, I feel like @Ultimate Steve is always in school during launches. I wouldn't recommend skipping class to watch, you've gotta graduate man! FIFY
  10. Ha! True story. McDonnell and Rockwell (in its various iterations) built basically everything else that went to space while Grumman only built the LEM which was effectively used once it was already in space. So maybe they’ve got them on a technicality.
  11. Since this has come up a few times, Boeing’s corporate structure is huge: https://www.boeing.com/company/bios/ I highly highly doubt that 2 divisions whose first manager in common is the CEO behave the same. Also worth noting, according to Boeing’s website: ” Every American spacecraft that has carried astronauts into space was designed and built by Boeing or Boeing’s heritage companies.
  12. Racescort666

    Embedded tweets on mobile

    At the risk of sounding like Jerry Seinfeld, what’s the deal with embedded tweets on mobile? Surely other people have noticed that the width is all borked when viewing a thread on mobile that has embedded tweets and other content. I didn’t see any threads on it and only brief discussion. I just want to make sure that this is a known issue to the people who can fix it.
  13. That doesn’t mean they don’t have a change control process to evaluate the necessity and impact of changes. The processes that I have seen be successful are ones that have a reporting system that everyone has access to, where issues are easy to raise (by anyone), severity is clearly spelled out to properly prioritize “nice to have” from “safety critical design change”, and issues that truly need to be implemented before anything bad happens get escalated to the proper levels. So the typical process has a freeze at the end of the design phase. The freeze is really a soft freeze where details of the design get worked out like model cleanup, tolerances are worked out, drawings are made, etc. before that, yeah, changes are made freely. Hypothetically, “nice to have” issues from the reporting system are implemented in the design phase and “nice to have” after the freeze gets logged into the system for the next design phase. If something comes up, change control is there to address critical changes and shut down things that aren’t. Change control is really important but just as important is a reporting system that is respected at all levels so when an issue comes up that could delay a program, the people who make the delay decision are properly informed. On the other side, change control is not about preventing changes but making sure that the program stays on time and on budget. If you are an engineer or a line worker and you have an idea of how to make whatever-it-is better and it can be done with little-to-no impact to cost and timing, it goes into change control for review. This is the point where impact to other groups is assessed (or before if you’re doing your job right). If there’s no impact to other groups, the change is allowed to be implemented. I don’t work for SpaceX, I work in the auto industry, but we do have complex products and the success of them is absolutely dependent on how well issues get handled. I would suspect that SpaceX is pretty good about balancing delay vs product improvements. Musk is a wild card about posting timelines but we have collectively recognized “Elon time” but that’s not to say that the product is unsafe or inferior. It’s just a case of delays are normal.
  14. Racescort666

    SpaceX Discussion Thread

    I hope they have a sign saying "You've Come to the Wong Place."