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Re: [PSUBS-MAILIST] Ambient Pressure (No Subject)
Pierre
It was just a thought a air switch would be easier to
use.
My thought was a panel with Hull pressure gauge and
Cabin pressure gauge and air switch in the middle of
them so on descend you could keep them equal by
simpling pushing the air switch not turning a valve on
and off. Ascent won't be a problem as most inline
check valves take a couple of psi to pass so on ascend
you will be running at a couple of psi over hull
pressure.
Still a very simple system.
I'm still having automated with manual backup.
once again just my thoughts.
Brent
--- Pierre Poulin <pipo305@hotmail.com> wrote:
> Hi Brent!
>
> Thanks for the letter. You have some very solid
> points I haven't tought.
>
> I was planning to have the sub just slitely negative
> with ballast full of
> water so the descend will be very slow. No problem
> since I plan to go at
> about max 60 foot.
>
> Very good idea about the check valve! I would have
> to check the outside
> pressure because my design can't resist pressure. I
> think I will install
> those two gages.
>
> The supply of air is a 3/8" dia line with the ball
> valve at 100 psi. I think
> it can supply enough air for the dive.
>
> I'm not too hot to relie on a automatic valve
> because of the poor pressure
> design of my hull.
>
> Thanks again for the advise! How is your project
> gooing?
>
> Pierre Poulin
>
>
>
>
> >From: Brent Shaw <drydivenz@yahoo.com>
> >Reply-To: personal_submersibles@psubs.org
> >To: personal_submersibles@psubs.org
> >Subject: Re: [PSUBS-MAILIST] Ambient Pressure (No
> Subject)
> >Date: Tue, 25 Mar 2003 14:07:56 -0800 (PST)
> >
> >Pierre
> >
> >After reading this I believe you could be heading
> for
> >danger and not being able to enjoy the scenery
> because
> >you'll be working to hard.
> >
> >What I see as being dangerous is if any water comes
> >into the hull, displacement changes and the sub
> will
> >go down. Watching a clear hose I think would not be
> >the right way the control of inside hull pressure
> >although it would work and is very simple.
> >
> >Driving along in your sub you'll be constantly
> turning
> >ball valves on and off as well as steering. I see
> that
> >as a lot of work and any little slip up and you
> could
> >crash.
> >
> >Just my two cents worth and I'm no expert
> >
> >On the hose going out of the hull run a one way
> check
> >valve.
> >
> >For air into the cabin run a 1/4 push air switch.
> >These 1/4 air switches run 900 liters per minute
> >@100psi
> >Or you could go for a polit operated regulator to
> make
> >the system automated.
> >
> >Run two 60psi gauges. one for outside hull pressure
> >and the other for inside hull pressure.
> >
> >I would also go for a flow meter. Comments about
> >surfacing to refresh the air don't gel right with
> me
> >at all.
> >
> >
> >Brent
> >
> >
> >
> >
> >
> >
> >
> >--- David Buchner <buchner@wcta.net> wrote:
> > >
> > > On Monday, Mar 24, 2003, at 19:40 US/Central,
> Pierre
> > > Poulin wrote:
> > >
> > > > I only have a hole at the bottom of the sub
> with a
> > > ball valve and a
> > > > piece of clear tubing that goes to the top and
> > > down to the bottom of
> > > > the sub. The end of the hose is open-. I also
> have
> > > another ball valve
> > > > that provide compressed air from a cylinder
> into
> > > the hull. So the
> > > > principle is very simple. If there is not
> enough
> > > air comming in the
> > > > sub to equalize the pressure, water will want
> to
> > > go into the sub by
> > > > the clear hose. I will see it gooing up and I
> will
> > > open the compressed
> > > > air valve to augment pressure inside the hull.
> If
> > > there is to much
> > > > compressed air comming in the hull, I don't
> care
> > > because the excess
> > > > will go out by the hose. The end of the hose
> is at
> > > the bottom of the
> > > > sub to expulse water that might comme into the
> sub
> > > and to expulse co2
> > > > which is heavyer that o2.
> > >
> > > That's the sort of simple way I might have come
> up
> > > with. But (and,
> > > apologies if you've described this more in the
> past
> > > and I forgot) --
> > > does this arrangement respond fast enough during
> > > descent and ascent? I
> > > guess: how big is that clear hose? What if
> you're
> > > rummaging in the
> > > cooler behind you for another beer, and your
> shirt
> > > sleeve catches on
> > > the dive plane stick, and you start ascending
> > > rapidly -- is there a
> > > danger of higher pressure building up inside
> because
> > > you're rising
> > > faster than the air gets out through your tube?
> > >
> > > - - -
> > >
> > > David
> > > buchner@wcta.net
> > > Osage, MN, USA
> > > http://customer.wcta.net/buchner
> > >
> >
> >
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>
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