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<div><font size="3">Alan,</font></div>
<div><font size="3">Thanks for digesting and presenting all that. <font face="Arial, Helvetica, sans-serif">The</font> summary and comparison of ABS and <font face="Arial, Helvetica, sans-serif">Germanischer Lloyd (GL) is very helpful. Did you look at Lloyds Register (London) any? Was there something that made you gravitate toward GL instead of LR?</font></font></div>
<div><font face="Arial, Helvetica, sans-serif" size="3">Jim</font></div>
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<div style="color: black; font-family: arial,helvetica; font-size: 10pt;">-----Original Message-----<br>
From: Alan James <alanlindsayjames@yahoo.com><br>
To: psubs.org <personal_submersibles@psubs.org><br>
Sent: Thu, Dec 5, 2013 3:09 am<br>
Subject: [PSUBS-MAILIST] G.L. Summary Stability & Buoyancy<br>
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<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">I'm afraid <font face="Arial, Helvetica, sans-serif" size="2">there</font> is nothing simple in this section. It is lacking in a lot of specifics.</div>
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">There
are statements such as "shall generally meet the standard
defined</div>
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">in the following unless special operational restrictions reflected in the class</div>
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">notification allow a lower level. & ...Depending on the type of submersible & the </div>
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">operation area, the distance
between the waterline in fully surfaced condition</div>
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">and the upper edge of entrance openings, air pipes,etc. which may be open</div>
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">for surfaced operation, has to be approved by G.L.</div>
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502"> ABS has a minimum distance from the waterline to the hatch opening of 30"</div>
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">whereas G.L. states; <span style="font-size: 14pt;">For
surfaced; </span><span id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_3357" style="font-size: 14pt;">a minimum </span><span id="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2486" style="font-size: 14pt; background-color: transparent;">distance between metacentric height & center of gravity </span><span id="yiv7320916847yui_3_13_0_ym1_7_1386063901473_17" style="font-size: 14pt; background-color: transparent;">of 10cm. (4") </span><span id="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2596" style="font-size: 14pt; background-color: transparent;">And for submerged, a minimum distance between center of buoyancy </span><span id="yiv7320916847yui_3_13_0_ym1_7_1386063901473_21" style="font-size: 14pt; background-color: transparent;">& center </span><span id="yiv7320916847yui_3_13_0_ym1_1_1386065276172_2496" style="font-size: 14pt; background-color: transparent;">of gravity of 5cm (2") (same as ABS). At no stage will G be
above B. (including after dropping the drop weight)</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2414" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span id="yiv7320916847yui_3_13_0_ym1_7_1386061802447_54" style="font-size: 14pt;">In the initial paper work sent before construction, a detailed analyses of stability is to</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span id="yiv7320916847yui_3_13_0_ym1_7_1386065276172_24" style="font-size: 14pt;">be </span><span id="yiv7320916847yui_3_13_0_ym1_1_1386065276172_3315" style="font-size: 14pt; background-color: transparent;">included. This takes the form of analyzing the heeling levers of 10 different load cases in fresh & salt water, 6 </span><span style="font-size: 14pt; background-color: transparent;">on the surface & 4 submerged & at 6 different heeling</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416 yui_3_13_0_ym1_1_1386231496534_2369" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">angles. So looks like 120 calculations. </span><span style="font-size: 14pt; background-color: transparent;">Heeling forces from free liquid surfaces, turning circles, wind, ice loads, transference </span><span style="font-size: 14pt; background-color: transparent;">of equipment & personal & payloads from working devices have to be considered.</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416 yui_3_13_0_ym1_1_1386231496534_2369" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">There needs to be sufficient ballast to keep a minimum of 10% of the pressure</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416 yui_3_13_0_ym1_1_1386231496534_2369" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">hull out of the water. The draught line has to be marked on the hull. </span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416 yui_3_13_0_ym1_1_1386231496534_2369" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">When one major ballast tank is damaged the hatch has to be able to open without</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416 yui_3_13_0_ym1_1_1386231496534_2369" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">water coming in & the heeling angle shouldn't exceed 22,5 degrees.</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416 yui_3_13_0_ym1_1_1386231496534_2369" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">There is an operational in water test at the end of construction with evaluation</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416 yui_3_13_0_ym1_1_1386231496534_2369" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">of the center of gravity upon which the pre build calculations were based.</span></div>
<div class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2370 yiv7320916847yui_3_13_0_ym1_1_1386065276172_2405 yiv7320916847yui_3_13_0_ym1_1_1386136859721_2416 yui_3_13_0_ym1_1_1386231496534_2369" id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" style='color: rgb(0, 0, 0); font-family: HelveticaNeue, "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; font-size: 14pt; font-style: normal; background-color: transparent;'><span style="font-size: 14pt; background-color: transparent;">Alan</span></div>
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<pre style="font-size: 9pt;"><tt>_______________________________________________
Personal_Submersibles mailing list
<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a>
<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a>
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