Re: [PSUBS-MAILIST] sub bouyancy

[MerlinSub@t-online.de (Carsten Standfuß)]

Alec Smyth schrieb:
> 
> My main objection to propane tanks is that they are much too thin-skinned to
> be optimal for a sub, even with stiffeners. Its tempting to use them because
> they're so readily available, but you can get a custom made cylinder very
> inexpensively, or even use a section of heavy walled pipe. There are lots of
> suppliers, and they really don't charge much for a big cylinder or endcaps.
> Steel is cheap.
> 
> - Alec
 
Here as plates about 1 DM or 0,45 dollar a kg steel 
=  0,45 dollar / 0,4536 equal to 0,2 dollar a pound.. 
And if you build bigger subs - you get the steel cheaper.. :-) 

I think even if you build a shallow water sub it makes more 
sence to purchase a bigger tickness shell and use less or even 
no frames than to use a to small in tickness shell 
and a hell of frames.. If you use frames in your propane tank - 
you must cut in at least in two parts - or make a longitudinal 
sail hole longer than the hull diameter .. 

Carsten