<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1415824464895_5265" dir="ltr"><span>Hi Roberto,</span></div><div id="yui_3_16_0_1_1415824464895_5265" dir="ltr"><span id="yui_3_16_0_1_1415824464895_5267">>>></span><span style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" class="" id="yui_3_16_0_1_1415824464895_5278">learn that i can be safe on a composite hull, even a wood hull below the 100 ft i can dive even on an oil drum</span><span style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" class=""> ....</span></div><div id="yui_3_16_0_1_1415824464895_5265" dir="ltr"><span style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" class="" id="yui_3_16_0_1_1415824464895_5291"> NO you won't be safe with any of those 3. Years ago we calculated that an oil drum wouldn't be safe to 15ft, & it also depends on it's condition.</span></div><div id="yui_3_16_0_1_1415824464895_5265" dir="ltr"><span style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" class="" id="yui_3_16_0_1_1415824464895_5292">Fiberglass is very difficult to analyze for strength due to the human equation, the saturation of the cloth & the fact that the cloth has different strengths in</span></div><div id="yui_3_16_0_1_1415824464895_5265" dir="ltr"><span style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" class="" id="yui_3_16_0_1_1415824464895_5293">different directions. At 100ft there is about 7,200lb pressure on every square foot of your hull, so calculations have to be very accurate to avoid being paste in a can on the sea bed:).</span></div><div id="yui_3_16_0_1_1415824464895_5265" dir="ltr"><span style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" class="" id="yui_3_16_0_1_1415824464895_5376">Did you see Phil Nuyten's paper on life support. It is very good.</span></div><div id="yui_3_16_0_1_1415824464895_5265" dir="ltr"><span style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" class="">Alan</span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1415824464895_5275"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1415824464895_5274"> <div dir="ltr" id="yui_3_16_0_1_1415824464895_5276"> <hr size="1" id="yui_3_16_0_1_1415824464895_5351"> <font size="2" face="Arial" id="yui_3_16_0_1_1415824464895_5277"> <b><span style="font-weight:bold;">From:</span></b> roberto alvarez via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> personal_submersibles@psubs.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, November 13, 2014 7:11 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] just more calc<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1415824464895_5273"><br><div id="yiv8630188239"><div dir="ltr" id="yui_3_16_0_1_1415824464895_5298"><div id="yui_3_16_0_1_1415824464895_5297"><div id="yui_3_16_0_1_1415824464895_5296"><div id="yui_3_16_0_1_1415824464895_5295"><div id="yui_3_16_0_1_1415824464895_5294">Good morning this weekend i read the book on the psubs website as i can read ,is a collection of designs and experiences, i am working with the air volume and CO2 production, this because i divide the project in 3 main areas, pressure hull-life support-control & propultion<br></div>learn that i can be safe on a composite hull, even a wood hull below the 100 ft i can dive even on an oil drum , the main concern will be O2 depletion and CO2 pollution we exhale 1.7 cubic feet hour and by coincidence we need 1.7 cubic meters per day<br></div>will use this info for a better internal space before any other consideration, yesterday i went to a LPG truck scrap yard, found that the inside of the tanks are free of rust, they have wave brakers ( internal plates ) have inspection holes with 2 inch tempered glass and build from 0.500 inch plate, 54 inch in diameter and 12 feet lengh, <br><br></div><div id="yui_3_16_0_1_1415824464895_5299">may be other option<br></div></div><div id="yui_3_16_0_1_1415824464895_5303"><div id="yui_3_16_0_1_1415824464895_5302"><div id="yui_3_16_0_1_1415824464895_5301"><div id="yui_3_16_0_1_1415824464895_5300"><br></div></div></div></div></div></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></body></html>