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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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