[ExI] trust the fake science?

[Keith Henson]

If you do study this, you might put in a paragraph about the
consequences of a large one failing.

Air isn't as dense as water, but below a modest depth, a collapsing
volume will generate more of a shock blast than the same volume of
TNT.

The consequences might be worse than one filled with hydrogen.

Keith

On Sun, Jun 9, 2024 at 12:51 PM Adrian Tymes via extropy-chat
<extropy-chat at lists.extropy.org> wrote:
>
> 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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