<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">While a little out of my depth on technical specs here-<div><br></div><div>A good friend and coworker here in San Diego has been an interesting person to discuss my “new hobby” with: He briefly worked as an electronic technician on ROVs with the Navy Deep Submergence Unit here, around the turn of this century.</div><div><br></div><div>When I told him about this discussion, his memory was that their oil compensation was done with plain old mineral oil.</div><div><br></div><div>Unsure if it’s worth considering but thought I’d share that historical context.</div><div><br></div><div>John<br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Jul 28, 2023, at 19:46, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">Cliff,<div>I don't think brushed motors are the way to go.</div><div>The brushes can contaminate the oil & lift due to the centrifugal force of the oil. And they are less efficient than brushless motors. Also the 101s have that double o-ring seal system, that means one of the o-rings will fail when over 30ft or so.</div><div>A descent brushless option with a ceramic mechanical seal and silicone compensation would be a big improvement.</div><div>I bought some of the Shell Morlina some years ago. An industrial chemist advised me it was low in aromatics and less likely to dissolve plastics than other options. I believe it was used to lubricate high speed spindles etc.</div><div>It still had an effect on plastics.</div><div>Alan </div><div><br><div id="ymail_android_signature"><a id="ymail_android_signature_link" href="https://mail.onelink.me/107872968?pid=nativeplacement&c=Global_Acquisition_YMktg_315_Internal_EmailSignature&af_sub1=Acquisition&af_sub2=Global_YMktg&af_sub3=&af_sub4=100000604&af_sub5=EmailSignature__Static_">Sent from Yahoo Mail on Android</a></div> <br> <blockquote style="margin: 0 0 20px 0;"> <div style="font-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Sat, 29 Jul 2023 at 12:42 pm, Cliff Redus via Personal_Submersibles</div><div><personal_submersibles@psubs.org> wrote:</div> </div> <div style="padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D00F6;"> _______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"> </div> </blockquote></div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span>Personal_Submersibles@psubs.org</span><br><span>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</span><br></div></blockquote></div></body></html>