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<div dir="ltr" data-setdir="false">Alan, a couple of points. I am not arguing that an oil compensated 101 is better than a purpose build brushless thruster. It is just a cost thing for me. Unless you are a machinist, my guess it is going to cost you several thousand dollars in the states to machine the thruster you have designed. OTS thrusters go for $5K and up and run at a much higher voltage than psubbers normally run at. Using the 101, with all its weaknesses, is a low-cost way for psubbers to fabricate a thruster. Given these constraints, I am just trying to make these function more reliably.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">With any luck, at the speed Hank works, he has already fabricated a 1-atm 101 with a magnetic coupling as tested to 1000 ft and all we have to do is work up the fabrication drawing!</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Keep us in the loop on progress on your thruster project.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Cliff</div><div><br></div>
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On Friday, July 28, 2023 at 09:46:14 PM CDT, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="ydpb4bf654dyiv2286890391"><div>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 clear="none"><div id="ydpb4bf654dyiv2286890391ymail_android_signature"><a shape="rect" id="ydpb4bf654dyiv2286890391ymail_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_" rel="nofollow" target="_blank">Sent from Yahoo Mail on Android</a></div> <br clear="none"> <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 id="ydpb4bf654dyiv2286890391yqtfd26685" class="ydpb4bf654dyiv2286890391yqt4614059976"><div><personal_submersibles@psubs.org> wrote:</div> </div></div><div id="ydpb4bf654dyiv2286890391yqtfd00707" class="ydpb4bf654dyiv2286890391yqt4614059976"> <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" href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"> </div> </div></blockquote></div></div></div><div class="ydpb4bf654dyqt4614059976" id="ydpb4bf654dyqtfd39762">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
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