14,304 karma · joined March 14, 2012
If you want to email me: keybase > github > dotfiles > .gitconfig
http://theinfosphere.org/Bender_Bending_Rodriguez#Compositio...
If it's not a joke... I have no words. You've all gone insane.
Excuse me, what?
Material was CF-ABS
From [1]:
> Olof Kindgren
> 5th April 2025 at 10:59 am
> It’s a great achievement, but I’m of course a little sad to see that it’s not mentioned anywhere that Wuji is just a renaming of my CPU, SERV. They even pasted in block diagrams from my documentation.
[0] https://github.com/olofk/serv
[1] https://www.electronicsweekly.com/news/business/2d-32-bit-ri...
First I resized /, /home, etc. for some extra space, then I moved them all forward a bit, then I resized /boot. Complicated by various layers of LVM and encryption.
This took longer and in retrospect was perhaps a bit riskier, but it had the advantage of not needing to change any configuration on the actual system (since all of the partition numbers/names/uuids remained the same -- they just showed up at slightly different places with slightly different sizes). So the whole operation could be done entirely from a live/rescue environment.
Options are wood again, or steel and concrete.
Maybe in another five years...
Charge to 80% most days, charge to 100% occasionally, avoid discharging beyond 10 or 15%.
Hopefully this is the last time anyone tries to make a negative pressure vessel out of carbon fiber.
In a negative pressure vessel that's a cylindrical shell, all of the force is being applied uniformly inward from the outside surface of the cylinder, so every part of every fiber will be in compression. There's no part of the structure that outside pressure would deform in a direction that would stretch the fibers -- you would need to have greater pressure on the inside for that to happen, and in that case, the fibers would again all be in tension.
One failure mode to consider is shear failure (i.e. if the changes in circumference due to compression on the outside vs. the inside of the hull are too different, resin between layers could start to fail.
The other would be micro-buckling of tiny sections of fiber in areas where the resin has already failed, or isn't as strong, or in layup defects.
If either of these cause enough deviation from the nominal structure shape to allow buckling to start, the hull will fail catastrophically.
> Also, think of the bill of a toucan or fiberglass surf board. A lot of rigidity comes from the tensile strength of the skin wrapped around an enclosed volume of relatively weak stuff that mostly keeps the skin in the right configuration.
It is like this, but as another comment [1] pointed out, in the case of a negative pressure vessel, the configuration is unstable -- If you develop just one defect, the entire thing implodes. You might be able to buy yourself a little more headroom with something like pre-stressed / post-tensioned concrete (not sure if there's a practical equivalent for carbon composites), but this is a pretty extreme negative pressure vessel...