interesting insight about inverted endcaps

"So lets adjust: how long can the cylinder be, with flat endcaps, to get a stability ratio of at least 1.2? Its easy to tweak the dimensions, and let High Frontier calculate the result. It turns out that, for a flat-capped cylinder of 250 m radius to be stable, it must be no longer than 285 m long. That gives us a livable area of 0.45 square km.

Why did you get different results from the Kalpana One paper? Ive gone over (your) math from that paper a number of times and it always looked solid. Are there some different parameters?

On Aug 12, 2014, at 10:48 AM, Joe Strout joe@strout.net [spacesettlers] wrote:

> Hi guys,
>
> I was playing last night with endcaps of various shapes (now that we
> have all the moments of inertia calculations built in). It led to what
> I think is a really interesting result. Details and pictures here:
>
> http://highfrontierblog.com/2014/08/12/invented-endcaps-are-better/
>
> Cheers,
> - Joe
>

So lets adjust: how long can the cylinder be, with flat endcaps, to get a stability ratio of at least 1.2? Its easy to tweak the dimensions, and let High Frontier calculate the result. It turns out that, for a flat-capped cylinder of 250 m radius to be stable, it must be no longer than 285 m long. That gives us a livable area of 0.45 square km.

Why did you get different results from the Kalpana One paper? Ive gone over (your) math from that paper a number of times and it always looked solid. Are there some different parameters?
On Aug 12, 2014, at 10:48 AM, Joe Strout
joe@...
[spacesettlers] <
spacesettlers@yahoogroups.com
> wrote:
Hi guys,
I was playing last night with endcaps of various shapes (now that we

have all the moments of inertia calculations built in). It led to what

I think is a really interesting result. Details and pictures here:
http://highfrontierblog.com/2014/08/12/invented-endcaps-are-better/
Cheers,
- Joe