[PSUBS-MAILIST] onboard gear

Mon Apr 22 18:12:53 EDT 2019

I believe our body needs at least 16% ppo2 at any given depth before
feeling drowsy and passing out?
Rick

On Mon, Apr 22, 2019 at 12:08 PM Hugh Fulton via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I started with two inch and a half valves but was concerned about the rate
> of pressurisation.  To half fill the sub it means you are only at 33 ft
> equivalent. The next stop at ¾ full is supposedly around 100 ft
> equivalent.  That is where it needs to slow down as the same flowrate would
> mean 300 ft of increase in only a few seconds..  So I have changed to two
> one inch valves for approx. 1.5 – 2.0 m3 of cabin space.  3” valve IMHO is
> too big.
>
>  I asked a bloke at the local university what mix it should be for 400 ft
> and I think he said about 12% O2 with helium to get out of the sub without
> narcosis but if you fill the Steinke with air then as it escapes and you
> breathe the mix in the hood it will deplete the mix in your lungs.  i.e.
> escape mix reg is only used to exit the sub.    The reason I chased that
> scenario is that evidently many sunken subs in the war had escape hatch
> open and the submariners lying outside around the hatch.  Deduction was
> that they were narc’d.  Chs Hugh
>
>
>
> *From:* Personal_Submersibles [mailto:
> personal_submersibles-bounces at psubs.org] *On Behalf Of *Alec Smyth via
> Personal_Submersibles
> *Sent:* Tuesday, 23 April 2019 7:36 AM
> *To:* Personal Submersibles General Discussion
> *Subject:* Re: [PSUBS-MAILIST] onboard gear
>
>
>
> Greg Cottrell once pointed out something that had been non-obvious to me
> in connection with bailouts from shallow-diving subs like ours - just how
> big the seacock needs to be to flood the sub quickly enough. Imagine you
> had a little ball valve of about the diameter of a garden hose. Now lets
> say you are hung up at 140 feet and need to bail. The ambient pressure is
> 60 psi, which happens to be the normal pressure for household plumbing.
> Therefore, your sub would take as long to fill up as it would if you opened
> the hatch while it was parked on your driveway and stuck the garden hose
> in. I'm not sure how long that is, and it will depend on the volume of your
> cabin, but surely it's way past the 10 minute no-decompression time for 140
> feet. The bottom line is PSUB seacocks need to be very generously sized
> because we dive shallow. Shackleton's is 3".
>
>
>
> Best,
>
> Alec
>
>
>
> On Mon, Apr 22, 2019 at 2:39 PM Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Shanee
>
>
>
> Depending on the depth that you have to flood the sub and make a free
> accent to the surface, it really depends on how fast you need to equalize
> to try and get to the surface before exceeding the nitrogen uptake limits
> for getting bent on course. Only the air cavity's are affected in a rapid
> pressurization I believe but my sub has a rated working depth of 350' and
> as I remember from the old navy tables, you only have about 5 minutes at
> 165' before you have to make a stop at 10' so due to that fact, I would
> have to flood the sub as fast as I can to minimize the nitrogen uptake to
> make it to the surface before getting bent and the negatives to that are
> that most people can't clear their ears that fast so you are looking at
> possibly blowing your ear drums which in turn is really painful and screws
> up you equilibrium which is going to hamper your safe accent to the surface
> in a timely manner. I am going to have mixed gas in my bailouts to buy me
> time for getting to the surface and keeping the nitrogen uptake as minimal
> as possible.
>
> Rick
>
>
>
> On Mon, Apr 22, 2019 at 7:15 AM Shanee Stopnitzky via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> Doesn't feel like it compared to Hank! Also, forgetting food, water,
> blankets and a first aid kit. Forgetting those has been my specialty for my
> whole life!
>
>
>
> Steinke hoods are probably a good idea, although I'm terrified of them
> myself. Does anyone have any information on what pressure change effects
> happen physiologically during an emergency escape? I'm a diver so I'm very
> familiar with what happens when you descend and ascend on scuba, but I'm
> not sure what happens with a sudden and extreme pressure increase. Other
> than all your organs getting squished, of course.
>
>
>
> Thanks for your input everybody!
>
>
>
> On Sun, Apr 21, 2019 at 6:58 PM Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Shanee,
>
>
>
> That's a pretty comprehensive list you have, and I couldn't fit all that.
> But how about a pair of Steinke hoods? Oh, and one very simple thing... a
> flashlight.
>
>
>
> Best,
>
> Alec
>
>
>
> On Sun, Apr 21, 2019 at 4:35 PM Shanee Stopnitzky via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
> Hi all,
>
>
>
> I'm wondering what everyone's onboard safety/repair kits contain, or what
> 'loose' gear you carry on dives with you. Ours are (so far):
>
>
>
> *CG requirements*
>
> air horn
>
> whistle
>
> life jackets
>
> fire extinguisher
>
>
>
> *safety*
>
> fire blanket
>
> 2x scuba masks
>
> 2x spare air
>
> primary gas analyzer
>
> backup gas analyzer
>
> spare CO2 scrubber - battery powered
>
> handheld radios
>
> uw radio system
>
>
>
> *repair kit*
>
> gorilla tape
>
> electrical tape
>
> butyl tape
>
> zip tie assortment
>
> spare battery terminals
>
> spare wire connectors
>
> spare wire
>
> splash zone
>
> JB weld
>
> steel tie wire
>
> steel strap
>
> e6000 glue
>
> hose clamp assortment
>
> screwdriver set
>
> adjustable wrench
>
> multi-tool
>
> hammer
>
> scissors
>
>
>
> What's in your kits?
>
>
>
> Best,
>
> Shanee
>
>
>
> --
>
> Institute for Emergence//Community Submersibles Project
>
>
>
> :::::
>
>
>
> 'The fact remains that political frontiers are impervious to our verbal
> cultures, while the substantially nonverbal civilization of playfulness
> crosses them with the happy freedom of the wind and the clouds.' ~ Primo
> Levi
>
>
>
> :::::
>
>
>
> 'Caught up in a mass of abstractions, our attention hypnotized by a host
> of human-made technologies that only reflect us back to ourselves, it is
> all too easy for us to forget our carnal inherence in a more-than-human
> matrix of sensations and sensibilities. Our bodies have formed themselves
> in delicate reciprocity with the manifold textures, sounds, and shapes of
> an animate earth. Our eyes have evolved in subtle interaction with other
> eyes, as our ears are attuned by their very structure to the howling of
> wolves and the honking of geese. To shut ourselves off from these other
> voices, to continue by our lifestyles to condemn these other sensibilities
> to the oblivion of extinction, is to rob our own senses of their integrity,
> and to rob our minds of their coherence. ' ~David Abrams
>
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>
>
>
>
> --
>
> Institute for Emergence//Community Submersibles Project
>
>
>
> :::::
>
>
>
> 'The fact remains that political frontiers are impervious to our verbal
> cultures, while the substantially nonverbal civilization of playfulness
> crosses them with the happy freedom of the wind and the clouds.' ~ Primo
> Levi
>
>
>
> :::::
>
>
>
> 'Caught up in a mass of abstractions, our attention hypnotized by a host
> of human-made technologies that only reflect us back to ourselves, it is
> all too easy for us to forget our carnal inherence in a more-than-human
> matrix of sensations and sensibilities. Our bodies have formed themselves
> in delicate reciprocity with the manifold textures, sounds, and shapes of
> an animate earth. Our eyes have evolved in subtle interaction with other
> eyes, as our ears are attuned by their very structure to the howling of
> wolves and the honking of geese. To shut ourselves off from these other
> voices, to continue by our lifestyles to condemn these other sensibilities
> to the oblivion of extinction, is to rob our own senses of their integrity,
> and to rob our minds of their coherence. ' ~David Abrams
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> _______________________________________________
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>
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