Re: [PSUBS-MAILIST] Reserved buoyancy

[Erik Muller <emuller@naic.edu>]

Hello Carsten,
I am just following up on that calc.
I am unclear why the displacement is different for salt and fresh water. 
I know that the boyant force will be different, but surely if I put a 
1cm cube of metal into a cup of liquid, I still displace 1cm, regardless 
of anything else disolved., Do you mean to write that the boyant force 
is 1 5323 kg (i.e. rather than  m^3) in fresh and 1 5706 kg in sea?
Thanks Carsten,
EM.

Carsten Standfuss wrote:

> Show us the general weight calculation of your boat here.. 
>
> I estimate that : 
>
> A.1) Estimate bouancy calculation : 
>
> 0,921 by 0,921 x 3,1415/4 x 2,3 m = 1,5323 m3 displacement in freshwater
> (1,5706 in seawater) without endcaps and outside displacement parts. 
>
> B.1) Estimate weight calculation : 
>
> hmm...
> Which tickness has the pipe ?  Mild steel or stainless ?
>
> regards Carsten
>
>
> Steven Mills schrieb:
>  
>
> > Ouch ! Marius,
> >
> > What grade and standard of steel did you get?
> >
> > --Steve
> >
> > On Wed, 10 Mar 2004 15:58:33 +0200 "Greeff, Marius (M)"
> > <Marius.Greeff@sasol.com> writes:
> >    
> >
> > > Howdy,
> > > I think I bought the wrong piece of steel to start my pressure hull
> > > with. I end up calculating about 700kg buoyancy reserved on the
> > > design before motors, batteries and all the rest are added. I wish
> > > to get this right before I buy the rest of the steel needed to
> > > build. My design have the hull already 2.3m long and a diameter of
> > > 921mm(36").
> > >
> > > Kind Regards
> > > Marius
> > >
> > >      
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