Re: Fw: [PSUBS-MAILIST] Re: Blowing ballast (was: question about general design?)

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

CSSX will get 3 drop weights made from steel plates 
about 80 mm (3,2inch) thick and each 1,3 t heavy. Structure 
and price reasons for steel here. 
The internal fix ballast will be also made from steel bars 
(and not lead) for price and health reasons. 
Sgt.Peppers keel has a mixture of steel and lead bars and plates.
lead was only use at the bow end for trimming porpose. 

Mercury in old scuba bottles is nice choise. 
My suba bottle (10 Liters) filled with mercury will be 
two times my own weight.. Mercury has a 1,2 point greater 
density than lead or 1.7 to steel. But is really expensive.. 
Two old scuba air bottles, one in the bow and one in the stern
a pipe and a pump - ready is a very compact trimming system. 
And in emergency as last hope you can drop the mercury by only 
opening a valve. 


Lew Clayman schrieb:
> 
> --- Greg Cotton <gregc02@attglobal.net> wrote:
> > In other words, use ALL rebar. A big chunk of iron is THREE times better that
> > rock or concrete and about 66% as good as lead...and a whole lot cheaper!
> 
> ... and soft steel IS reasonably benign, as far as I've heard.  Rusts away, causing little
> trouble.  Certainly wrecks are beloved by reef-dwelling species.
> 
> Might be a good choice, Birkenstock-wise
> 
> =====
> "Yo no soy marinero / Soy capitan"
>           - Traditional Mexican Lyric (La Bamba)
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