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The good news is that is weighs 246 pounds a quart. The bad is it's toxic
waste, and evaporates easily. It has gone from being expensive to being a
liability. My advice is stick with lead, slide it if you need to.
-Peter
Does anybody know where I can get some mercury
?
Brian Cox
----- Original Message -----
Sent: Tuesday, February 17, 2004 3:04
PM
Subject: Re: [PSUBS-MAILIST] battery
acid? & battery issue follow up
I can cast lead.
Carl,
Sand
or gravel is to light for ballast in a sub. It's mass is so much
more
then lead for the same weight that it's impractical in a compact
sub. A
load of gravel in a pickup truck pretty much fills the box. If
it were
lead, it would be a sheet on the bottom of the
floor.
Remember it only the displacement over and above what the same
mass of water
weighs that's effective as ballast.
Dan
H.
----- Original Message -----
From: "Coalbunny"
To:
Sent:
Tuesday, February 17, 2004 5:49 AM
Subject: Re: [PSUBS-MAILIST] battery
acid? & battery issue follow up
> Shawn, that is
something that I have wondered about- will the ballast
> shift? I
have read how a number of scientific units used lead or steel
>
shot. Is there anything that prohibits that being used? IIRC! at
one
> time even mercury was used. Of course we know the
environmental
> implications from that. One thing I thought of using
that should be
> cost effective and would be environmentally
friendly is the use of sand
> or gravel. But since I have no real
unit to use that ballast method
> with, I have no idea if it'll
work.
> Carl
>
>
> NeophyteSG@aol.com
wrote:
> > In a message dated 2/16/04 5:47:29 AM Pacific Standard
Time,
> > Asmyth@changepoint.com writes:
> >
>
> Because Solo is intended as a "flying" sub, it's designed to have
a
> > very small self-righting moment. [snip] If Solo had
conventional
> > stability, she could never roll or fly
inverted.
> >
> > Totally understand. My design is
facing similar constraints except that
> > all my nonessentials
are fared external to the pressure hull which, Sgt.
> >
Pepper-ish, is much smalle! r than yours appears to be. In my case,
I'm
> > juggling axiometric placement of everything in the
horizontal and
> > vertical planes through the hull's
longitudinal axis, leaving the drop
> > weight(s) placement until
near the end to essentially force the righting
> > moment
equations to balance. I also liked the idea of essentially being
>
> able to use just about everything except the pressure hull as a
drop
> > weight should the absolute need arise.
>
>
> > What gave me a worse headache was trying to figure out a
functional
> > ballast system for a craft which will
hypothetically have six degrees of
> > freedom, won't "slosh"
around (changing the center of buoyancy), and
> > will work no
matter what the orientation of the craft ... including
> > upside
down.
> >
> > Given the batteries are snug against the
hull "ceiling", I can't
> > reach the lu! gs to connect the
cables unless they are upside down.
> > Plus, I don't want the
lugs shorting out against the hull. If they
> > cannot go upside
down, I'll probably have to lower everything by
> > about 3".
Plus, all the cables will now be a few inches too short.
>
>
> > Aside from simply not having the room, you're making me
glad that I
> > chose to mount all but the two emergency reserve
batteries outboard ...
> > not meaning to take pleasure from your
pain. :)
> >
> >
> > In a message dated 2/16/04
7:00:24 AM Pacific Standard Time,
> > Asmyth@changepoint.com
writes:
> >
> > The Lifelines can be used in any
position, but only charged upright.
> > The Optimas can be used
or charged in any position at all.
> > Unfortunately, I can't do
a straight replacement because Optima
> > doesn't make a battery
as large as the ones I'm using. So it looks
> > like I need to
modify my hardware and calculations to turn them
> > right side
up
> >
> > FWIW, possible KISS solution: Incorporate a
pivot and latch into the
> > mounting hardware whereby you can
drop them down into an upright
> > position for charging -- when
you won't be occupying that space -- then
> > latch them back
upside down and against the hull during dives. If the
> > current
cabling reaches the lugs in their upside down position, you
> >
won't even have to lengthen them because they'll just need to
rotate
> > 180-degrees. Make sense?
> >
> >
Warm Regards
> > Shawn
> >
> >
> >
*****
> >
> > "Call nothing thy own except thy
soul.
> > Love not what thou art, but only what thou may
become.
> > Do not pursue pleasure, for thou may have the
misfortune to overtake
it...
> >! ; Live in the vision of that
one for whom great deeds are done ..."
> >
> > Man of
LaMancha, D. Wasserman
>
> --
> Spotted Owl...it's
what's for dinner.
>
>
Fact is
stranger than fiction. Truth is stronger than fact. R. Duncan
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