<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div dir="ltr" id="yui_3_16_0_1_1419882201702_6077"><span>Hank,</span></div><div dir="ltr" id="yui_3_16_0_1_1419882201702_6079"><span id="yui_3_16_0_1_1419882201702_6078">I just ran a test on my pressure program & you get the same crush depth</span></div><div dir="ltr" id="yui_3_16_0_1_1419882201702_6080"><span id="yui_3_16_0_1_1419882201702_6081">on a sphere of A516-70 steel that is 1000mm diameter & 10mm thick as you</span></div><div dir="ltr" id="yui_3_16_0_1_1419882201702_6080"><span id="yui_3_16_0_1_1419882201702_6084">do on a sphere 100mm diameter & 1mm thick.</span></div><div dir="ltr" id="yui_3_16_0_1_1419882201702_6080"><span id="yui_3_16_0_1_1419882201702_6255">What I am not sure of is if you can scale up the drag results on a model.</span></div><div dir="ltr" id="yui_3_16_0_1_1419882201702_6080"><span id="yui_3_16_0_1_1419882201702_7136">If you have a scale model that is 1/50th & it takes X amount of force to push it </span></div><div dir="ltr" id="yui_3_16_0_1_1419882201702_6080"><span id="yui_3_16_0_1_1419882201702_7141">at 3 knots, can you multiply X by 50 to get the required thrust?</span></div><div dir="ltr" id="yui_3_16_0_1_1419882201702_6080"><span>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_1419882201702_6087"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1419882201702_6086"> <div dir="ltr" id="yui_3_16_0_1_1419882201702_6085"> <hr size="1" id="yui_3_16_0_1_1419882201702_6089"> <font size="2" face="Arial" id="yui_3_16_0_1_1419882201702_6088"> <b><span style="font-weight:bold;">From:</span></b> Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, December 30, 2014 8:43 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] model testing<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1419882201702_7142"><br>Hank,<br> I would say no. It would have to be so exact that it would be virtually impossible to extrapolate from the small model, and aside from that I think there are other engineering principles involved that would come into play , Sean would be the person to ask ! I know that it is done in wave tanks and wind tunnels, but in those you are looking at laminar flow and such things, not structural strength so much. You might be able to get a rough idea of how it would start to collapse maybe. The larger the model the better I would think.<br><br>Brian<br><br>--- <a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1419882201702_7143">personal_submersibles@psubs.org</a> wrote:<br><br>From: hank pronk via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: <a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br>Subject: [PSUBS-MAILIST] model testing<br>Date: Mon, 29 Dec 2014 10:52:46 -0800<br><br>Hi all<br>If you make a scale model of a submarine in complete detail. Scale the size and metal thickness, is it a reasonable representation of depth capabilities when pressure tested?<br>Hank<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>_______________________________________________<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>