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

[Lew Clayman <lew_clayman@yahoo.com>]

--- 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


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"Yo no soy marinero / Soy capitan"
          - Traditional Mexican Lyric (La Bamba)
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