<font color='black' size='3' face='Arial, Helvetica, sans-serif'><font class="Apple-style-span" size="3">Which suggests a big inner tube if you want to convert a DW2000 to that definition. Otherwise, keep the door shut, or prepare to swim.</font>
<div><font class="Apple-style-span" size="3">Vance<br>
</font><br>
<br>

<div style="font-family: helvetica, arial; font-size: 10pt; color: black; ">-----Original Message-----<br>
From: Phil Nuytten <phil@philnuytten.com><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Sent: Thu, Dec 5, 2013 11:11 am<br>
Subject: Re: [PSUBS-MAILIST] G.L. Summary Stability & Buoyancy<br>
<br>




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<div>The minimum hatch to waterline measure applies to those submersibles 
‘intended to be entered while afloat’ - </div>


<div>Phil</div>


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<div style="font-color: black"><b>From:</b> <a title="jonw@psubs.org" href="mailto:jonw@psubs.org">Jon Wallace</a> </div>


<div><b>Sent:</b> Thursday, December 05, 2013 7:33 AM</div>


<div><b>To:</b> <a title="personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">Personal Submersibles General 
Discussion</a> </div>


<div><b>Subject:</b> Re: [PSUBS-MAILIST] G.L. Summary Stability & 
Buoyancy</div>
</div>
</div>


<div> </div>
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<div class="moz-cite-prefix"><br>
I think the first sentence is key, "Submersibles 
will be assigned Class only after it has been demonstrated that their buoyancy 
and their static and dynamic stability in in tact condition is adequate FOR THE 
SERVICE INTENDED".  Some of the lack of specificity is because they can't 
conceive of every possible application.  They do however have quite a few 
specifics as you outlined.  Some of the testing won't apply (ie fuel load) 
and it's possible that a narrow scope of service might lower number of tests 
required.<br>
<br>
<br>
On 12/5/2013 4:08 AM, Alan James wrote:<br>
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<div id="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2440" class="yiv7320916847yui_3_13_0_ym1_1_1386063901473_2362                                  yiv7320916847yui_3_13_0_ym1_1_1386065276172_2398  yiv7320916847yui_3_13_0_ym1_1_1386136859721_2405" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue, 'Helvetica                                   neue', Helvetica, Arial, 'lucida                                   grande', sans-serif; COLOR: rgb(0,0,0); BACKGROUND-COLOR: rgb(255,255,255)">
  
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<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502">I'm afraid there 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande', sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande', sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); 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 id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><span style="FONT-SIZE: 14pt; BACKGROUND-COLOR: transparent">Alan</span></div>

  
<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><span style="FONT-SIZE: 14pt; BACKGROUND-COLOR: transparent"><br>
</span></div>

  
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<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><span style="FONT-SIZE: 14pt; BACKGROUND-COLOR: transparent"><br>
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<div id="yiv7320916847yui_3_13_0_ym1_1_1386061802447_2502" 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" style="FONT-SIZE: 14pt; FONT-FAMILY: helveticaneue,                                     'Helvetica Neue', helvetica, arial,                                     'Lucida Grande',                                     sans-serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><span style="FONT-SIZE: 14pt; BACKGROUND-COLOR: transparent"><br>
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<pre>_______________________________________________
Personal_Submersibles mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a>
<a class="moz-txt-link-freetext" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a>
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_______________________________________________<br>
Personal_Submersibles mailing 
list<br>
<a 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>
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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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