<div dir="ltr">From a displacement perspective, K-250 Snoopy weighs about 2,500 lbs and drop tray with weights is 154 lbs. ~ Doug S.  </div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Nov 12, 2016 at 11:19 PM, Alan James via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2431"><span>Hank,</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2512"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2511">GL says in Section 7 Arrangement for Diving/Ballasting, Control/Compensating & Trimming....</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2514"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2513">In the event of the failure of the compensating tank system, the submersible shall be capable</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2674" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2680">of surfacing by jettisoning of ballast & or emergency blowing of the diving tanks, & has to float</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2724" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2726">on the surface in an upright stable position.</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2727" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3214">Section 15 Rescue system, 3.1 .... Mathematical proof is to be furnished that, after release of</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2875" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3017">the solid ballast the submersible rises safely to the surface & floats there in a stable position.</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3039" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3110">   They stipulate elsewhere that you have to have a drop weight; but from section</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3109" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3108">7 it seems that it is there only to cover a failure of the compensating tank. I assume the compensating</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3112" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3111">tank is a hard tank. So you would need enough ballast in your drop weight to cover the full </span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3114" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3113">condition of your compensating tank. This seems a bit funny because your air for blowing your</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3181" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3180">tanks has to be enough to cover the event of any major failure of a cavity such as the battery</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3176" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3175">pod. You would think that this air might also suffice for the compensating tank failure.</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3179" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3178">  So as long as you have enough to cover that, & don't turn upside down on the surface or way up,</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3177" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3209">ie. your centre of buoyancy is still above your center of gravity, you should be right.</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3254" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3253">   According to section 7 it seems that as long as there is enough compressed air to compensate for any of these</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3255" dir="ltr"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3353">failures at your dive depth, then you would need very little weight. I say very little because</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3354" dir="ltr"><span>of the rule that you need a drop weight. :)</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3395" dir="ltr"><span>Let me know if it is not making sense.</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3396" dir="ltr"><span>Alan</span></div><div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3338" dir="ltr"><span></span> </div><div class="m_-7572916808559644087qtdSeparateBR" id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2515"><br><br></div><div class="m_-7572916808559644087yahoo_quoted" id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2678" style="display:block">  <div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2677" style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2676" style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2675" dir="ltr"> <font id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2679" face="Arial" size="2"> <hr size="1" id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_2745"><span class=""> <b><span style="font-weight:bold">From:</span></b> hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>><br> <b><span style="font-weight:bold">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> <br> </span><b id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3041"><span id="m_-7572916808559644087yui_3_16_0_ym19_1_1479007606283_3040" style="font-weight:bold">Sent:</span></b> Sunday, November 13, 2016 2:45 PM<br> <b><span style="font-weight:bold">Subject:</span></b> [PSUBS-MAILIST] drop weight<br> </font> </div> <div class="m_-7572916808559644087y_msg_container"><span class=""><br><div id="m_-7572916808559644087yiv1354825615"><div><div style="color:rgb(0,0,0);font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12px;background-color:rgb(255,255,255)"><div id="m_-7572916808559644087yiv1354825615yui_3_16_0_ym19_1_1479001374322_5258">Can someone tell me what the proper weight of a drop weight is.  There must be a rule.</div><div id="m_-7572916808559644087yiv1354825615yui_3_16_0_ym19_1_1479001374322_5258">Hank</div></div></div></div><br></span>______________________________<wbr>_________________<span class=""><br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br><br><br></span></div> </div> </div>  </div></div></div><br>______________________________<wbr>_________________<br>
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