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Cake day: June 22nd, 2023

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  • It stands for “maximum dynamic pressure”, and is a fluid dynamics concept. It’s the moment when the spacecraft is under the most stress, and therfore where certain things are most likely to fall apart.

    It’s caused by a combination of atmospheric density and velocity. To avoid issues, there’s a rough rule of “don’t accelerate too much until you’re high enough that the atmosphere thins out” during launch, and “don’t hit the atmosphere too fast” during reentry.

    Here’s a chart for the IFT-3 launch. At one minute you can see that acceleration decreased for a few seconds, to minimize the strength of max-Q.













  • I think you’ve fixed it! Right now the stickies are this thread and the 7-18 bulletin :)

    Responding to your comment on thread #54: your early-April comment announcing this thread didn’t appear until I clicked on the link in your reply today. My click seems to have pulled it over. Which seems like a really strange federation issue, given that all your other comments seem to appear in world. Though I guess I wouldn’t know?

    If I get a chance this weekend I’ll try to compare some World threads to Sh.itjust.works ones and let you know what I find!



  • Just letting you know that the Lemmy.World stickies are broken again, and we’re still seeing Development Thread #54. I posted a link over there.

    I don’t think there’s anything you or I can do about it. Took me a while to realize what was happening.

    As always, thanks for these updates! They are very much appreciated even when I don’t actively engage. Additionally, I keep meaning to thank you for posting Nitter links for as long as you could. You’re awesome :)