<html><head></head><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_1447818862149_12032"><span>Hank,</span></div><div dir="ltr" id="yui_3_16_0_1_1447818862149_12031"><span id="yui_3_16_0_1_1447818862149_12030">what was the cost of the lpg tank per lb of buoyancy.</span></div><div dir="ltr" id="yui_3_16_0_1_1447818862149_12031"><span id="yui_3_16_0_1_1447818862149_12120">Could you use a number of smaller lpg tanks so as not</span></div><div dir="ltr" id="yui_3_16_0_1_1447818862149_12031"><span id="yui_3_16_0_1_1447818862149_12126">to put all your eggs in one basket.</span></div><div dir="ltr" id="yui_3_16_0_1_1447818862149_12031"><span id="yui_3_16_0_1_1447818862149_12171">Your idea of pressurizing them would give additional </span></div><div dir="ltr" id="yui_3_16_0_1_1447818862149_12031"><span>assurance against crushing.</span></div><div dir="ltr" id="yui_3_16_0_1_1447818862149_12031"><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_1447818862149_11987"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1447818862149_11986"> <div dir="ltr" id="yui_3_16_0_1_1447818862149_11985"> <hr size="1" id="yui_3_16_0_1_1447818862149_12029"> <font size="2" face="Arial" id="yui_3_16_0_1_1447818862149_11984"> <b><span style="font-weight:bold;">From:</span></b> hank pronk 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 id="yui_3_16_0_1_1447818862149_12122"><span style="font-weight: bold;" id="yui_3_16_0_1_1447818862149_12121">Sent:</span></b> Wednesday, November 18, 2015 12:48 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] syntactic foam<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1447818862149_12033"><br><div id="yiv1042565986"><div id="yui_3_16_0_1_1447818862149_12035"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;" id="yui_3_16_0_1_1447818862149_12034"><div dir="ltr" id="yiv1042565986yui_3_16_0_1_1447803591051_3413">I am not sure I would want to risk an impact with the floats that could weaken them and potentially have them fail at depth. I feel it best to have them fully protected under a cowl. I suspect your right that they are tough enough, but I wouldn't want to chance it. I have seen a picture of a DW with about 20 floats tied to the front of the sub. They must have had an over weight item mounted temporarily that needed compensating. </div><div dir="ltr" id="yiv1042565986yui_3_16_0_1_1447803591051_3413">Hank</div> <br clear="none"><div class="yiv1042565986qtdSeparateBR" id="yui_3_16_0_1_1447818862149_12036"><br clear="none"><br clear="none"></div><div class="yiv1042565986yqt8496049574" id="yiv1042565986yqt45121"><div class="yiv1042565986yahoo_quoted" style="display:block;" id="yui_3_16_0_1_1447818862149_12041"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;" id="yui_3_16_0_1_1447818862149_12040"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;" id="yui_3_16_0_1_1447818862149_12039"> <div dir="ltr" id="yui_3_16_0_1_1447818862149_12038"><font size="2" face="Arial" id="yui_3_16_0_1_1447818862149_12037"> On Tuesday, November 17, 2015 4:30 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv1042565986y_msg_container" id="yui_3_16_0_1_1447818862149_12042">I only just now looked up the trawl floats. I notice that they have a<br clear="none">depth rating which may match what you need, and you may also be able to<br clear="none">take advantage of the form factor, instead of viewing it as a<br clear="none">restriction... If the floats are available as spheres with a through<br clear="none">hole, what about mounting an array of them down either side of your boat<br clear="none">on a round bar which is part of the superstructure to serve double-duty<br clear="none">as hard fenders? Placing them outboard like that would increase your<br clear="none">surface stability as well.<br clear="none"><br clear="none">Sean<br clear="none"><br clear="none"><div class="yiv1042565986yqt2233441217" id="yiv1042565986yqtfd41712"><br clear="none">On 2015-11-17 14:03, hank pronk via Personal_Submersibles wrote:<br clear="none">> Sean,<br clear="none">> I have looked at building steel buoyancy tanks- they are just to heavy<br clear="none">> to be effective. I am trying to keep the sub as light as possible and<br clear="none">> trawl floats are better than 50% buoyant to weight. Unless there is a<br clear="none">> serious risk to using trawl floats, I think they are the most logical<br clear="none">> and cost effective choice at 3 dollars per lb of buoyancy . I will<br clear="none">> also have substantial MBT volume to offset failed trawl floats. If<br clear="none">> I am wrong, please correct me, I would love to have steel tanks, that<br clear="none">> is right up my alley.<br clear="none">> Hank<br clear="none"><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br clear="none"><br clear="none"></div> </div> </div> </div></div></div></div></div><br><div class="yqt8496049574" id="yqt41497">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br><br></div> </div> </div> </div></body></html>