Re: [PSUBS-MAILIST] PSUB Fatalities...

["Captain Nemo" <vulcania@interpac.net>]

----- Original Message -----
From: "Vikking" <vikking@mindspring.com>
To: <personal_submersibles@psubs.org>
Sent: Monday, March 06, 2000 12:08 AM
Subject: Re: [PSUBS-MAILIST] PSUB Fatalities...


> hello, the only thing i can thinkof when comparing what is like tryng to
get
> out of a small vessel that is being floded is a litle fish that somebody
put
> on the toilet bowl to clean the aquarium, and by mistaque somebody
flushed!!
>
> lets run a simulation to help whith the safety issue, and by the way i
think
> that driving on I95 down to Miami is more dangerous, than a psub.
>
> the pilot will not be able to get out till the vessel is completely
floded,
> he will need to push against a lot of pressure to get out, how does your
> vessel behaves when flooded? hey no need to try rigth now... this is only
a
> simulation...
> may be you will be upside down , stern down , sideways?, meanwhile the
> partially floded vessel is descending , there is not shallow water, only
> deep shit...
>  the pilot has manage to breath from the scuba inside the psub, so he
still
> alive, but deep, what is the descent rate of the vessel when floded, ?
>
> the only way the pilot can earn some time is by decreasing the rate of
> descent, which also decreases the force at which the water comes in , but
,
> i can tell you it comes pretty fastmy point is that scuba will save  the
> pilot some time, but it will not insure is safety, it needs to be use
added
> in addition of  a way to stop the vessel to sink below critical deph, for
> the diver 50 meters) and become positive buoyant, hey we are not planning
to
> leave our toys  rusting on the bottom are we?
>
> Gabriel Feldman
> ---- Original Message -----
> From: Captain Nemo <vulcania@interpac.net>
> To: <personal_submersibles@psubs.org>
> Sent: Sunday, March 05, 2000 6:51 AM
> Subject: Re: [PSUBS-MAILIST] PSUB Fatalities...
>
>
> >
> > ----- Original Message -----
> > From: <VBra676539@aol.com>
> > To: <personal_submersibles@psubs.org>
> > Sent: Saturday, March 04, 2000 3:11 PM
> > Subject: Re: [PSUBS-MAILIST] PSUB Fatalities...
> >
> >
> > > As an addendum to what I said the other day to Pat about blow and go
> > ascents and Navy type escape gear, it seemed that I missed a point.
Pat's
> > sub and Jon's and some others are limited depth vehicles. I forgot that
> any
> > accident (well, nearly any) that might require flooding of these hulls
> would
> > occur in shallow water ... relatively speaking. Shallow enough to fall
> into
> > the sport/air diving categories which would certainly allow egress in a
> > SCUBA rig, and might even allow time to deploy buoys or lift lines or
> > something. So for the smaller shallower guys, SCUBA seems like a good
> > option.
> >
> >
> > Right on.  I stay shallow, but ya never know; she could, say, bust a
> window.
> > Then, my immediate concern will be how to avoid drowning before I can
get
> > out or my dive crew can get to me; that's where the SCUBA comes in.
> >
> > VIKKING makes a good point about getting hung up on exit: my hatch is
> REALLY
> > small (an unavoidable consequence of fitting a working sub inside a
scale
> > fictional design).  I wouldn't be able to get out wearing the rig.  But
> I'm
> > pretty relaxed underwater, and I'm betting I can keep my cool long
enough
> to
> > stay alive while she bottoms out, open the hatch, exit, and pull the
tank
> > out behind me.  At that point, (unless I'm hurt) I don't see myself
> > immediately breaking for the surface, but rather, working with the dive
> crew
> > to get a plan going as to how we're going to salvage my sub.
> >
> > I think there's been a lot of good safety considerations made in this
> > thread.  Another one I'd like to suggest is the addition of an EXTERNAL
> > FLOOD VALVE your rescuers can get to, that will enable them to equalize
> > pressure inside the boat and get to you in the event you're stuck on the
> > bottom, incapacitated,  and trapped inside.  I don't have one of these
on
> my
> > boat yet, but after reading about the German accident, I'm going to
> install
> > one.  (That guy was only in about 100 feet of water; I'm wondering why
> > divers couldn't get him out, and I'm guessing maybe they didn't have a
way
> > to equalize the pressure on the hatch?  Carsten / Anybody know about
this
> > part of the accident?)
> >
> > I think experimental homebuilt subs are always going to be chancy; but
if
> we
> > strive for safety, I believe we can operate them within reasonably
> > acceptable levels of calculated risk.
> >
> > Pat
> >
>
>