[ExI] trust the fake science?

[Adrian Tymes]

On Sun, Jun 9, 2024 at 3:33 PM Keith Henson <hkeithhenson at gmail.com> wrote:

> On Sun, Jun 9, 2024 at 11:06 AM Adrian Tymes via extropy-chat
> <extropy-chat at lists.extropy.org> wrote:
> > On Sun, Jun 9, 2024 at 1:48 PM Keith Henson <hkeithhenson at gmail.com>
> wrote:
> >> A long time ago I saw an analysis of this which used concrete for the
> >> shell.  As I recall, the concrete was 6 inches thick and the whole
> >> thing was a mile in diameter.
> >
> > Yeah, I'm going for a more practical size.  Something that would work
> well at the size of modern airship balloons.
>
> I kind of doubt that will work.


Not with concrete, obviously.  Part of the trick is a very specific mix of
materials (which I'm treating as a trade secret until and unless I start on
my PhD project with this as its topic, which will be no earlier than next
year even in the best case).


> Then you need to find materials with the requisite
> strength and density.  Maybe diamond.
>

It turns out that much more available materials can do it - but in a
composite, not a single material.

Not sure this justifies a PhD project.  Maybe a day with Mathematica.
>
> And it strikes me as something I would expect to find on the net, and
> when I looked:
>
> https://en.wikipedia.org/wiki/Vacuum_airship


The amount of work people have put into this, as evidenced at that link,
should show it's more than "a day with Mathematica".  Besides, the proposed
project includes actually making one.
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