[PSUBS-MAILIST] onboard gear

Mon Apr 22 15:36:05 EDT 2019

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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>>> _______________________________________________
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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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