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Re: Fw: [PSUBS-MAILIST] Re: Blowing ballast (was: question about general design?)
--- Marsee Skidmore <heyred@email.msn.com> wrote:
> No, 96 lb/cu ft was a number quoted for broken stone. Didn't say how
> broken, but this was kinda the low average for a couple of different types
> and forms. Like Dave says, solid rock ranges up around 150 lb/cu ft. - Joe
Then, VERY roughly, you need around 5-7 times the volume of stone vs lead to reach an equal
weight. yeah?
Seems that tree-huggin' ballast is still potentially viable, no?
-L
>
> ----- Original Message -----
> From: Lew Clayman <lew_clayman@yahoo.com>
> To: <personal_submersibles@psubs.org>
> Sent: Tuesday, August 28, 2001 10:06 PM
> Subject: Re: Fw: [PSUBS-MAILIST] Re: Blowing ballast (was: question about
> general design?)
>
>
> >
> > --- Marsee Skidmore <heyred@email.msn.com> wrote:
> > > > I've been considering using gravel ballast, out of
> > > > granola-eatin'-Birkenstock-wearin'-tree-huggin' environmental
> > > sensibilities.
> > > > Besides, it's cheap. But Vance speaks a mouthful. Lead has a density
> of
> > > > 710 lb/cu ft, compared to stone (basalt, granite, gneiss) at 96 lb/cu
> ft.
> > > > Please excuse my English units, but this is bad news in any language.
> >
> > Ouch. And that assumes, I suppose, an "ingot" of stone - not a bunch of
> gravel with space between
> > the chunks, which makes for more volume and (effectively) far lower
> density. Dang.
> >
> > > > how much volume it takes to equal a chunk of lead the size of a shoe
> box.
> >
> > Roughly speaking, based on the above, a hunk of granite the size of a
> small headstone... in effect
> > it *is* a small headstone, come to think of it. Bad mojo!
> >
> > -L
> >
> >
> > =====
> > "Yo no soy marinero / Soy capitan"
> > - Traditional Mexican Lyric (La Bamba)
> > =====
> >
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>
=====
"Yo no soy marinero / Soy capitan"
- Traditional Mexican Lyric (La Bamba)
=====
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