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Re: [PSUBS-MAILIST] battery acid? & battery issue follow up
For what it is worth to the discussion:
1) When I read "Water Baby" the story of Alvin, I remember mention of how
difficult it was to keep the plumbing of the Hg system from leaking.
2) from this site here:
http://www.unols.org/dessc/papers/new_alvin_update.html
"Elimination of Hazards Associated with a Mercury Trim System - The replacement
of the Hg trim system by a water based system integrated with the variable
ballast system will eliminate both the potential health threat to the Alvin
technicians and the material hazard associated with carrying Hg on a ship with
copper alloyed piping."
3) The moveable lead weight seems like a good idea to me. I'll bet that an
electro-mechanical actuator can move the lead from side to side or end to end
much faster that pumping Hg. In SOLO that could be a big advantage.
Regards,
Jeff
Quoting Brian Cox <ojaibees@ojai.net>:
> I don't intended on drinking it, and it will be in a closed loop and
> sealed. The fact that it is liquid makes it ideal for pumping from
> point A to point B.
>
> Brian
> ----- Original Message -----
> From: atozed@juno.com
> To: personal_submersibles@psubs.org
> Cc: personal_submersibles@psubs.org
> Sent: Tuesday, February 17, 2004 6:30 PM
> Subject: Re: [PSUBS-MAILIST] battery acid? & battery issue follow up
>
>
> 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
>
> On Tue, 17 Feb 2004 18:03:20 -0800 "Brian Cox" <ojaibees@ojai.net>
> writes:
> Does anybody know where I can get some mercury ?
>
> Brian Cox
> ----- Original Message -----
> From: Bob Duncan
> To: personal_submersibles@psubs.org
> Sent: Tuesday, February 17, 2004 3:04 PM
> Subject: Re: [PSUBS-MAILIST] battery acid? & battery issue follow
> up
>
>
> I can cast lead.
>
> Bob
>
> "Dan H." <jmachine@adelphia.net> wrote:
> 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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