<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt"><div></div><div id="yiv3971601525"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt;" class="yui_3_13_0_ym1_1_1385770452280_2271"><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">Hi everyone,</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">While reading through some background info for the G.L.</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">certification document, I came across this link with a good</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">explanation of stability & buoyancy</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554"><a
href="http://maritime.org/doc/fleetsub/chap5.htm">http://maritime.org/doc/fleetsub/chap5.htm</a><br></div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">There is a phenomena described, where submarines can be </div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">unstable to the point of turning over during the transition from</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">surface to diving & vice versa.</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">This has to do with the centre of buoyancy moving upward past</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">the centre of gravity. As it approaches the centre of gravity the</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">submarine is at it's most vulnerable point.</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">This would be different for individual designs & a worry if</div><div
id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">you dropped your emergency drop weight.</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">I had been told by a pilot that he never stuffed around while</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">descending & liked to drop as quick as he could.</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">I didn't have a full understanding of this & thought there may</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">be others in the same boat.</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554">Regards Alan</div><div id="yiv3971601525yui_3_13_0_ym1_1_1385768974238_2554"><br></div></div></div></div><span></span><div></div></div></body></html>