<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi Shanee,</div><div id="AppleMailSignature">welcome along. I don't imagine there is a quick fix for strengthening the</div><div id="AppleMailSignature">hull. You would have to have either a thicker hull & reinforcing rings or fit</div><div id="AppleMailSignature">new internal or external reinforcing rings. And then there is the reinforcement </div><div id="AppleMailSignature">of the conning tower, & penetrations. All that stuff would be quite difficult to</div><div id="AppleMailSignature">do retrospectively. Would take quite a bit of analysis first.</div><div id="AppleMailSignature"> You can get down to scuba diving depths by setting the sub up as an ambient</div><div id="AppleMailSignature">sub. This involves some sort of system to pressurise the inside of the hull</div><div id="AppleMailSignature">to the same pressure as the water pressure at the depth you are at.</div><div id="AppleMailSignature">One method of achieving that is to attach modified scuba second stage regulators</div><div id="AppleMailSignature">to through hulls. </div><div id="AppleMailSignature"> There are short comings with this as you have a different style of life support</div><div id="AppleMailSignature">than a 1atm sub in that you have air flowing in at 20 liters per minute per person </div><div id="AppleMailSignature">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, </div><div id="AppleMailSignature">& everything inside the hull comes under pressure. Particularly vulnerable to this</div><div id="AppleMailSignature">pressure are the large electrolytic capacitors found in motor controllers. There are</div><div id="AppleMailSignature">also issues with corrosion as compressed air is forced into any electronic enclosures</div><div id="AppleMailSignature">& may have a high level of humidity.</div><div id="AppleMailSignature">Quite happy to answer any further questions. It would be great to see your sub</div><div id="AppleMailSignature">if you have any pictures or have anything up on the psub projects page.</div><div id="AppleMailSignature">Cheers Alan</div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 11/03/2018, at 5:11 PM, Shanee Stopnitzky via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif;font-size:small">Hi all,</div><div class="gmail_default" style="font-family:georgia,serif;font-size:small"><br></div><div class="gmail_default" style="font-family:georgia,serif;font-size:small">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!</div><div class="gmail_default" style="font-family:georgia,serif;font-size:small"><br></div><div class="gmail_default" style="font-family:georgia,serif;font-size:small">Is there a searchable archive of past email threads? I wasn't able to find any. </div><div class="gmail_default" style="font-family:georgia,serif;font-size:small"><br></div><div class="gmail_default" style="font-family:georgia,serif;font-size:small">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. </div><div class="gmail_default" style="font-family:georgia,serif;font-size:small"><br></div><div class="gmail_default" style="font-family:georgia,serif;font-size:small">Best fishes,</div><div class="gmail_default" style="font-family:georgia,serif;font-size:small">Shanee </div><div class="gmail_default" style="font-family:georgia,serif;font-size:small"><br></div><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div><div><font face="georgia, serif">~~~~^~~^~~~~^~~^~~^~~~~^~~^~~^~~<br></font></div><font face="georgia, serif"><>< <>< ) <*III>< <br>
</font></div><font face="georgia, serif"> <>< <>< <>< ( ( <*III>< </font><div><font face="georgia, serif"><>< <>< <>< ) ) </font></div>
</div><div><font face="georgia, serif"><br></font></div><div><font face="georgia, serif"><br>'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 <br></font></div></div></div></div>
</div>
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