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Re: [PSUBS-MAILIST] safety issues
Adding to that is the length of the sub (the recovery arc) and the decks
acting as a planing surface.
I really do like the idea of diving in shallow water (scuba depths) unless
transiting.
Rick L
----- Original Message -----
From: "Alec Smyth" <Alec.Smyth@compuware.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, January 05, 2006 1:24 PM
Subject: RE: [PSUBS-MAILIST] safety issues
> I'm no student of military subs, but I remember reading somewhere that
> one of the concerns was reaching crush depth due to a malfunction of the
> dive planes. With the speed and mass of the big boats, if you're moving
> fast and your controls jam in the "dive" position, apparently you would
> hit crush depth before you could stop. Not exactly one of my concerns in
> a K boat!
>
> Alec
>
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Ian
> Roxborough
> Sent: Thursday, January 05, 2006 2:52 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] safety issues
>
>
> On Thu, 5 Jan 2006 09:41:08 -0800 (PST)
> Robert Ossian <rob_neptune@yahoo.com> wrote:
>
> > - 3 seperate and emergency independent surfacing
> > methods, not including "bail out"
>
> Do you have a last resort "bail out" option?
>
> > - Additionally, crush depth will actually be around
> > 400 feet, but the sub will only be rated for approx
> > 250, giving wide margin for safety.
>
> One way of looking at the the margin is "how long do you have to solve
> you problem before you hit crush depth". With 150feet safety margin, if
> you are sinking at 1 foot per second, the time from max opteration depth
> to crush depth is 2.5 minutes. If you are decending at 2 feet per
> second, your time is 1.25 minutes.
>
> Ian.
>
>
> > - Primary & secondary escape points on differing
> > ends of the sub, each of which can be opened from the interior. This
> > way, if one is blocked the other shouldn't be.
> > - Many other safety features...
> >
> > Also, the AutoCAD designs for the sub are being
> > created in easily segmentable stages so that ASME
> > certified folks can check my designs thoroughly for
> > accuracy before the first seam is welded.
> >
> > Many of these could easily be quantified as "wastes of
> > money" or unnecessary to some, but when compared to
> > the average cost of a funeral they seem pretty cheap
> > to me. ;-)
> >
> >
> > --- rick miller <rickm@pegasuscontrols.com> wrote:
> >
> > > guys
> > >
> > > the safety issues are paramount in the design of
> > > a 1 ATM sub, redundant everything. A wet subs issues
> > > are a lot easier to deal with, all else fails get
> > > out. The hull of a 1 atm sub is about the only thing
> > > that can not be made redundant. a one test to 1.5
> > > times working pressure is a good start that does
> > > nothing to tell use about the effects of pressure
> > > cycles or minor damage. Remember that comet
> > > aircraft, or another of the many that have had
> > > fuselage failures.
> > >
> > > abs specs are a pain and expensive to comply
> > > with as said before they come from a history of
> > > failure. With that said, there are some areas that
> > > money can be saved. gas piping for example, using
> > > swagelok valves rated for the working pressures and
> > > hydroed after installation stops the need for
> > > certified valves. total redundant systems that share nothing are the
>
> > > way to go.
> > >
> > > ports are not a place to save money, while have
> > > them built and tested to pvho standards is expensive
> > > there are no backups so bite the bullet a spend the
> > > money. if we design view ports to aircraft standards
> > > a k-250 window would be 6.7 inches thick and come
> > > with certs that would track back to the individual chemicals in the
> > > acrylic. those of you who are using off the shelf acrylic sheets
> > > should at a minimum test one port to failure.
> > >
> > >
> > > Rick m
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> > __________________________________________
> > Yahoo! DSL - Something to write home about.
> > Just $16.99/mo. or less.
> > dsl.yahoo.com
> >
> >
> >
> >
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