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--></style></head><body lang=EN-AU link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Thank you Sean, That was nice of you. It would appear that I was a little ambitious, too heavy. Looks like I will have to look at 100 feet 43psi or .299MPa. Approx.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>My criteria of weight is more important than depth, besides scuba is another criteria, and ‘normal’ scuba max is 130 feet, so that’s okay.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Thanks again cheers Les </span><span style='font-size:11.0pt;font-family:"Segoe UI Emoji",sans-serif'>😊</span><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><o:p> </o:p></span></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Personal_Submersibles <personal_submersibles-bounces@psubs.org> <b>On Behalf Of </b>Sean T. Stevenson via Personal_Submersibles<br><b>Sent:</b> Wednesday, 5 November 2025 1:52 PM<br><b>To:</b> Personal Submersibles General Discussion <personal_submersibles@psubs.org><br><b>Subject:</b> Re: [PSUBS-MAILIST] Assistance needed, anyone please!<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'>Here is your hull using ASTM A516 Grade 70 steel, assuming that the 2 m dimension is the outer diameter of the sphere:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><img width=1956 height=1375 style='width:20.375in;height:14.3263in' id="Picture_x0020_2" src="cid:image001.png@01DC526F.94CE2E60"></span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'>If I repeat the calculation, but use 2 m as the inside diameter (generally you design to ID, because that is typically how heads are manufactured), you get the following:<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><img width=1956 height=1375 style='width:20.375in;height:14.3263in' id="Picture_x0020_1" src="cid:image002.png@01DC526F.94CE2E60"></span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'>Hope that helps.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'>Sean<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'>On Monday, November 3rd, 2025 at 23:42, via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<o:p></o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Thank you Sean, It was so pleasing that several people unselfishly replied to my request.</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Thank you for the calc offer, no, the weight factor is for a completely different reason. If that is the weight then it is far too heavy I had considered 1/4” thickness sheet would be suitable, but did not know the framing required and safety margin requirements. To confirm this is for 100m (150psi) no opening no window, just the sphere! Again, thank you, Cheers Les </span><span style='font-size:11.0pt;font-family:"Segoe UI Emoji",sans-serif'>😉</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Personal_Submersibles <<a href="mailto:personal_submersibles-bounces@psubs.org">personal_submersibles-bounces@psubs.org</a>> <b>On Behalf Of </b>Sean T. Stevenson via Personal_Submersibles<br><b>Sent:</b> Friday, 24 October 2025 2:10 AM<br><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br><b>Subject:</b> Re: [PSUBS-MAILIST] Assistance needed, anyone please!</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'>Les, I can happily run some test cases this weekend to figure the hull material weight of your proposed sphere, but if your concern is the ultimate handling / trailering weight, as a functional submersible that is going to be exactly the weight of an equivalent sphere of seawater, at ~ 1,025 kg/m^3. For your 2m sphere, that will be 4,293.5 kg or 9,465.5 lbs.<o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'>Sean<o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'>On Wednesday, October 22nd, 2025 at 19:00, via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<o:p></o:p></span></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Arial",sans-serif'> </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>After many years and many hospital holidays, </span><span style='font-size:10.5pt;font-family:"Segoe UI Emoji",sans-serif;color:black'>🙂</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'> I am no longer a financial member.</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>However, I am hoping that someone may assist me in the spirit of Psubs.</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>If memory serves, there was a calc formula on your site of which I no longer have access .</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>Any way, I have a project idea that to continue with, relies on the minimum weight achievable for the following ;</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'> </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>A 2 meter diameter sphere with appropriate bracing material and with safety margins </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>To dive to sea-water safe depth of 150meter (160psi) No doors No windows </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>Windows and doors will add much I know, however, are details to be considered later only if the basic weight indication makes the project viable.</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>So basically, I need to know the framing and sheeting steel sizes and thicknesses to <b>calculate the overall weight</b> in this basic form. If positive at such point I will apply for re- membership to follow through with my idea.</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>I know this sounds vague and I am asking much, but could someone assist me in this very basic task, which I know not how to do. </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>Thanking any member who might be inclined to assist me. </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>Cheers Les </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif;color:black'>Safe diving </span><span style='font-size:10.5pt;font-family:"Segoe UI Emoji",sans-serif;color:black'>🙂</span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Arial",sans-serif'> </span><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p></o:p></span></p></div></blockquote><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:"Arial",sans-serif'> <o:p></o:p></span></p></div></blockquote></div></blockquote><p class=MsoNormal><span style='font-size:10.5pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p></div></div></div></body></html>