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<div dir="ltr" data-setdir="false">Alan, </div><div dir="ltr" data-setdir="false">In my case with E3000, if I have a rope in the prop and am stuck, I would jettison the bottom half of the sub giving me 600 lbs lift. I also have an enormous air supply from my buoyancy tanks that can be emptied into the MBT's . At 3000 feet I still have 2400 psi to work with in the tanks. I bought magnets with 60 lbs holding force and will use two per motor. I always test stuff like this, so I will test how much pull it takes to break the motors free. If the force is too great, I can weaken the force by putting thin non magnetic spacers between the magnet and base. I really like this idea, if it works out, any sub owner could could refit this to their existing mounts. It is unbelievable the magnet power and choices.</div><div dir="ltr" data-setdir="false">Hank</div><div><br></div>
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On Monday, July 15, 2019, 8:08:21 PM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv1736697053"><div><div></div><div>Hank,</div><div>thinking this through more; if you had your vertical thrusters in a slot that</div><div>takes the vertical thrust, then this may impede the detachment of the thruster</div><div>if the only force you can apply to the thruster is vertical to break it free from</div><div>the magnets. Ie. If a rope is caught in the thruster & you have blown ballasts</div><div>then the pull on the rope would be vertical & against the edge of the slot.</div><div> If the magnets were mounted inside the hull & you removed them, then you</div><div>would have a lot more chance of getting the thruster to drop off.</div><div>Alan</div><div class="yiv1736697053yqt4128937643" id="yiv1736697053yqt85410"><div><br clear="none">On 16/07/2019, at 10:37 AM, Alan via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div></div></blockquote></div></div><div><div class="yiv1736697053yqt4128937643" id="yiv1736697053yqt96386"><div></div><div>Hank,</div><div>the magnets in my open underwater motor from Blue Robotics are coated</div><div>with a marine epoxy & are used in seawater.</div><div>There are large free magnets in old microwaves. I have some tiny 1/4"</div><div>neodymium magnets & they magnetise through an inch of wood.</div><div>I would experiment with putting the magnets inside the hull, & having a metal base</div><div>on the thrusters; that way you could assist in the breakaway of the thruster by</div><div>removing the magnets, rather than just rely on pulling power. Additionally you </div><div>wouldn't need to paint them & could experiment more readily with the power by </div><div>adding & subtracting. Another thought is having magnetic bases that are </div><div>used for mounting dial gauges; you could turn their switch to remove them.</div><div>Good idea re magnets Hank, hadn't considered that. </div><div>Alan</div><div><br clear="none">On 16/07/2019, at 9:10 AM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div class="yiv1736697053ydp5baf4992yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div dir="ltr">Alan, </div><div dir="ltr">Yes I will make a pocket to take the vertical force. I think since the magnets are so cheap, I will just replace them when they corrode. Maybe spray them with WD-40. I did that with my hatch spring and it is amazing how well it worked.</div><div dir="ltr">Hank</div><div><br clear="none"></div>
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On Monday, July 15, 2019, 3:02:24 PM MDT, Alan via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="yiv1736697053"><div><div></div><div>Hank,</div><div>If you could mount them in a slot so that the vertical thrust pushes against the</div><div>edges of the slot, that would require less power from the magnets. ( you were</div><div>probably planning that anyway). </div><div>Magnets are corrosive so you would have to either coat them or mount them</div><div>Inside the hull. They should magnetise through the hull if strong enough.</div><div>If the magnets were mounted inside the hull you may be able to knock them</div><div>sideways out of the way to help release the thruster.</div><div>I would have some way of pinning the thrusters during transport, & take the</div><div>magnets off ( some how ) during storage.</div><div>One thought is that a powerful electro magnet may help with the removal of</div><div>the magnets.</div><div>Alan</div><div class="yiv1736697053yqt1510180083" id="yiv1736697053yqt22390"><div><br clear="none">On 16/07/2019, at 8:25 AM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div class="yiv1736697053yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr">Hi All, I want to make magnetic bases for my vertical thrusters on E3000. The thrusters are mounted to the hull section that jettisons witch is bad. I figure the best way to jettison the motors in my case is to mount them with magnets that will break away. Anyone try this?</div><div dir="ltr">Hank</div></div></div></blockquote></div><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><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></span><br clear="none"></div></blockquote></div></div><div class="yiv1736697053yqt1510180083" id="yiv1736697053yqt81592">_______________________________________________<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></div>
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