[PSUBS-MAILIST] newbie looking for core starter info

[Alan via Personal_Submersibles]

Hi Shanee,
welcome along. I don't imagine there is a quick fix for strengthening the
hull. You would have to have either a thicker hull & reinforcing rings or fit
new internal or external reinforcing rings. And then there is the reinforcement 
of the conning tower, & penetrations. All that stuff would be quite difficult to
do retrospectively. Would take quite a bit of analysis first.
   You can get down to scuba diving depths by setting the sub up as an ambient
sub. This involves some sort of system to pressurise the inside of the hull
to the same pressure as the water pressure at the depth you are at.
One method of achieving that is to attach modified scuba second stage regulators
to through hulls. 
  There are short comings with this as you have a different style of life support
than a 1atm sub in that you have air flowing in at 20 liters per minute per person 
rather than O2 & a scrubber. You are breathing compressed air & are subject to the same dive times & stops as a scuba diver. You need a lot of air to equalise the hull, 
& everything inside the hull comes under pressure. Particularly vulnerable to this
pressure are the large electrolytic capacitors found in motor controllers. There are
also issues with corrosion as compressed air is forced into any electronic enclosures
& may have a high level of humidity.
Quite happy to answer any further questions. It would be great to see your sub
if you have any pictures or have anything up on the psub projects page.
Cheers Alan


Sent from my iPad

> On 11/03/2018, at 5:11 PM, Shanee Stopnitzky via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi all,
> 
> I just purchased a simple, shallow (30') water homemade personal sub that I would like to consider retrofitting to be able to dive deeper. I have Frank Busby's book and am wondering if there are more sources of essential reading on building and maintaining a sub. We plan to go slowly and carefully with any developments, but I need to start somewhere!
> 
> Is there a searchable archive of past email threads? I wasn't able to find any. 
> 
> Thanks for any and all input. It would be also great if there is anybody out there who is particularly enthusiastic about answering many newbie questions because I will have a lot and don't want to annoy the whole group all the time. 
> 
> Best fishes,
> Shanee 
> 
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