<html><head></head><body><p dir="ltr">Getting rid of every last air bubble isn't strictly necessary (although you should attempt to), provided you have enough compensation volume to account for the bubble volume when they shrink under pressure. If you really are about attention to detail, draw a vacuum on the housing before you begin the oil fill.</p>
<p dir="ltr">I have never been a fan of compensation at ambient with no bias pressure, but if you use a bladder with any elasticity (such as a hot water bottle or soft blocked tubing like surgical tubing), you can effectively accomplish the bias by overfilling the bladder so it is stretched a bit.</p>
<p dir="ltr">Fill at a low point, and vent at a high one.</p>
<p dir="ltr">Sean</p>
<br><br><div class="gmail_quote">On December 5, 2016 11:01:22 AM MST, Alec Smyth via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div dir="ltr">Hi James,<div><br /></div><div>I totally agree on the difficulty of filling up. Well the filling is easy, it's getting rid of the last bubbles that is the real issue. For a thruster compensation bladder, the last thing I was testing on Snoopy before her sale was little plastic squeeze bottles. Google "plastic accordion bottle" and you should get some hits. Like this:</div><div><br /></div><div><a
href="https://www.grainger.com/product/5FVF7?gclid=CjwKEAiAvZTCBRDvnoOaoa2j3xISJABxPjN9ekm4clPKgKRoIN07DTRepXFPSkcSB1GAMOTILj3jBRoCcMfw_wcB&cm_mmc=PPC:GOOGLEPLAA-_-Adhesives%2C%20Sealants%20and%20Tape-_-Dispensing%20Guns-_-5FVF7&AL!2966!3!50916782397!!!g!104636426757!&s_kwcid=AL!2966!3!50916782397!!!g!104636426757!&ef_id=VzemaAAAAJR6JHK7:20161205180023:s">https://www.grainger.com/product/5FVF7?gclid=CjwKEAiAvZTCBRDvnoOaoa2j3xISJABxPjN9ekm4clPKgKRoIN07DTRepXFPSkcSB1GAMOTILj3jBRoCcMfw_wcB&cm_mmc=PPC:GOOGLEPLAA-_-Adhesives%2C%20Sealants%20and%20Tape-_-Dispensing%20Guns-_-5FVF7&AL!2966!3!50916782397!!!g!104636426757!&s_kwcid=AL!2966!3!50916782397!!!g!104636426757!&ef_id=VzemaAAAAJR6JHK7:20161205180023:s</a><br /></div><div><br /></div><div><br /></div><div>Best,</div><div><br />Alec</div></div><div class="gmail_extra"><br /><div class="gmail_quote">On Mon, Dec 5, 2016 at 7:28 AM, James Frankland 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 dir="ltr"><div>Hi All</div><div> </div><div>I have been talking to Rick about motor compensation which has got me thinking.</div><div> </div><div>I originally did my motors like other psubbers have done with the rubber tubes around the sides, but have found them a real pain to fill. Problem is the location of the tube, plus the tiny bit of protruding pipe nipple on the inside.</div><div> </div><div>So, I modified the motors by drilling a hole in the top part of the aluminium endcap and use that now as the vent\final fill. Its better, but still awkward.</div><div> </div><div>I have suggested to Rick this idea, which I am tempted to adopt myself. Blocking off the existing side mounted pipe nipples and filling\venting\compensating all from the one top
hole. There would be a rubber bulb of some sort on the end of the pipe. 2x pictures show filling and operation. Appologies for rubbish drawings, im at work.</div><div> </div><div>What does everyone think?</div><div> </div><div><img width="535" height="397" src="content://com.kaitenmail.attachmentprovider/198d86e3-140a-4752-9d24-e8385b094106/37/RAW" /></div><div><img width="535" height="380" src="cid:ii_iwc1yl0f1_158cef4735829b90" /><br /><br /></div></div>
<br />______________________________<wbr />_________________<br />
Personal_Submersibles mailing list<br />
<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr />org</a><br />
<a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr />listinfo.cgi/personal_<wbr />submersibles</a><br />
<br /></blockquote></div><br /></div>
</blockquote></div></body></html>