Somewhere between “I want to play sci-fi video games all day,” “I want to invent everything ever,” and “I want to go on a 6-month backpacking trip in the wilderness.”

  • 2 Posts
  • 26 Comments
Joined 1 year ago
cake
Cake day: June 14th, 2023

help-circle
  • I’m a tinkerer as well, but I’m at a point in my life where I need to prioritize my tinkering haha. Like buying stir-fry takeout (Windows/MacOS), cooking it by buying a pre-packaged bag (packaged mainstream Linux distro), or starting from scratch, experimenting with literally everything from chopping technique to cooking temp for each ingredient, until you realize you’re missing an ingredient you need, then you have to go back to the store (Arch lol).


  • I do something similar (though less secure) for general purpose passwords; I have a couple of common “base” passwords that are decently secure that I commit to memory. Then for each website/service, I pick a pattern based on the name/url (maybe something like the first two and last three characters of the url), and append them to one of my “base” passwords, so each site gets a unique password, but I only have to remember a couple of them + the pattern










  • I feel like, at their core, most religions boil down to two things, for most people:

    • Giving you purpose/security/scapegoats (“I’m living a good life so I can go to heaven,” “the Lord has a plan/is watching over me,” “Satan/sinners/demons tempted me”)
    • Dissuading you from inquisitive, critical thought (out of self-preservation, I’d imagine)

    Personally, I prefer to define my own purpose, live a more “dynamic” lifestyle than is traditional, think critically, and question authority. Doesn’t make me “better” than religious folks, in fact they’re probably overall happier than I am. But I can’t imagine living that way, regardless of whether or not I believe in a magical sky Santa who can’t decide whether he loves us unconditionally or whether or not he’s actually omnipotent.





  • Oh no, it totally matters. In the case of a receiving tank, rated for 300 psi internal pressure vs 1 atm external. The limiting factor there would be tensile strength, or how well the material resists being pulled apart. Sticking it underwater with 1 atm internal would test a combination of compressive and tensile strength, but more compressive (if it were a perfect sphere, it would just be compressive). Good news is, steel is a relatively good choice for both.

    Which was one of the complaints about the material choice for the Titan; Carbon fiber has high tensile strength, but low compressive strength. The strength of the hull had more to do with the resin than the carbon fiber itself. In fact, I’d be curious to know if there was even a benefit to using carbon fiber over regular fiberglass. That and it’s hard to inspect for fatigue compared to other materials like steel.

    Case and point: Deepsea Challenger, the sub used by James Cameron to go to the bottom of the Marianas Trench, had a pressure hull made of steel.


  • I mean, today, entirely seriously, I spent about an hour looking at used prices for air receivers for this exact purpose. You can totally get 250 gallon tanks rated to 300 psi that are about the right size to fit one person and all the electrical components inside. Cut off one end and replace it with an acrylic/poly-carbonate dome, add a keel, ballast system, and thrusters on the outside, cover it all with a fairing, and you’re good to go!

    I’m thinking I could prototype a functional sub rated to 150 m for around $10k. Totally worth it.

    Trust me, I’m an engineer as well lol