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Cake day: 2023年6月22日

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  • clothes@lemmy.worldtoMicroblog Memes@lemmy.worldOutstanding idea.
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    4 天前

    Musk is gross and SpaceX has some questionable marketing claims that you’ve identified, but I don’t see how anyone could claim that anything about the company’s products are a shitshow.

    Falcon 9 has radically changed the economics of the space industry, and has no competition to force lower prices.

    Starship has had a very successful testing campaign, and operates within a different development paradigm than Saturn. They’ve shown more progress on more technology in the last year than almost any rocket ever. It won’t be long before Starship has demonstrated all the capabilities you mentioned. While the price tag is large in absolute terms, it will be very cheap relative to the competition.

    Dear Moon was not canceled by SpaceX, and no one who follows the industry has ever believed Musk’s timelines.

    I guess I’m confused, because everything I know about Starship points towards it being one of the most incredible engineering accomplishments ever. There are lots of other problems with SpaceX’s leadership, environmental impact, and work culture, but aren’t the products inspiring?








  • 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.