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Re: [PSUBS-MAILIST] RE: payload
Hi Ray,
You would still be losing the weight of the oil from inside the sub. And you would realize positive buoyancy from the oil ( in a badder) in a open tank connected to the sub. You would have to use way more oil than you would just using air. I'm not sure I am comprehending the though on this.
Brian
----- Original Message -----
From: "Ray Keefer" <psubs2001@yahoo.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, December 05, 2006 11:15
Subject: Re: [PSUBS-MAILIST] RE: payload
> Hi Brian,
>
> I think the idea is to change the amount of
> displacement instead of changing the amount of weight.
> Pump the oil into the bladder and more water is
> displaced with the same weight of sub. Making the sub
> more bouyant. Pump the water out of the bladder,
> bladder collaspes causing less displacement for the
> weight, causing the sub to become less bouyant.
>
> Regards,
> Ray
>
> --- Brian Cox <ojaivalleybeefarm@dslextreme.com>
> wrote:
>
> > Water would be heavyer
> >
> > Brian
> >
> > ----- Original Message -----
> > From: "Andy Jensen" <drewacard@charter.net>
> > To: <personal_submersibles@psubs.org>
> > Cc: <ShellyDalg@aol.com>
> > Sent: Tuesday, December 05, 2006 07:37
> > Subject: Re: [PSUBS-MAILIST] RE: payload
> >
> >
> > > I was thinking about using an oil kept in side the
> > sub and pumping it into an expandable bladder out
> > side the sub using either an electric or hand
> > hydraulic pump.
> > >
> > > one through hull and one valve. A truck inner tube
> > in a small thin tank open tank.
> > > using water to force the oil back in. Most
> > hydraulic connections are rated at 3000PSI working
> > pressure should give me plenty of over head for
> > 600'.
> > >
> > > It seems to simple so what am I missing?
> > >
> > > Andy J.
> > >
> > >
> > >
> > > ---- ShellyDalg@aol.com wrote:
> > > Kory. I have always thought trim tanks were to
> > adjust trim, not compensate
> > > for varying loads.
> > > Water density changes with temperature and
> > salinity, but not very much. It
> > > is possible to run into a salty current or water
> > layer and trim can be added or
> > > reduced to compensate.
> > > Sometimes subs have forward and aft trim tanks to
> > change the angle of the
> > > sub while still maintaining neutral buoyancy.
> > > Adding lead ballast before a dive, depending on
> > load, is easier than having
> > > a separate, large system with associated piping
> > and tanks which requires
> > > maintenance, cost, and monitoring.
> > > With a few dives, you know how much added weight
> > your sub needs to reach
> > > neutral, and then you adjust with weights from
> > there for added passengers,
> > > cargo, new equipment, or whatever.
> > > Trim tanks need to be at one atmosphere, whether
> > full or empty.
> > > Ballast tanks are ambient.
> > > If your trim tank is half full and open to the
> > sea, ( like a ballast tank )
> > > the air will compress when you get deeper, and
> > you'll start sinking fast.
> > > Large, one atmosphere tanks for trim will require
> > heavy walled tanks, fill
> > > valves, drain valves, pressure monitoring, and
> > take up room and add weight
> > > because they're thick steel.
> > > And you have to flush them out after every dive so
> > they don't corrode.
> > > Better to have small tanks for trim and carry some
> > lead.
> > > Just my opinion....Frank D.
> > >
> > >
> > >
> > >
> >
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