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<div dir="ltr" data-setdir="false">My guess is there would be adequate flow rate. First stage scuba regulator has to pass enough air to supply demand of the largest diver. My guess is filling four MD 101 thrusters at the descent rate of a psub would be less than required for a diver. Easy enough to make a calculation. Sense the downstream pressure at the HP port orifice is way less than half the upstream tank pressure, the flow of air through the small orifice is in critical flow. As such a shock wave forms at the orifice and mass flow rate becomes independent of downstream pressure. It is a function of only upstream (tank) pressure and the orifice diameter. </div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">When I get a chance, I will make a quick calc and see what the rates are. Good to check this.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Best</div><div><br></div>
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On Tuesday, August 1, 2023 at 04:09:41 PM CDT, Alec Smyth via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="ydp143b72b6yiv0013572975"><div><div dir="ltr"><font face="arial, sans-serif">Hi Cliff,</font><div><font face="arial, sans-serif"><br clear="none"></font></div><div><font face="arial, sans-serif">"<span style="color:rgb(38,40,42);">The Tescom 44-4069 regulator would be a clean installation with just a single 1/4 SS tubing run from the HP port of the 1st stage regulator to the input port of Tescom 44-4069 regulator."</span></font><div><font face="arial, sans-serif"><br clear="none"></font></div><div><font face="arial, sans-serif">There's a little problem with this plan, though easy to work around. <span style="color:rgb(38,40,42);">The HP ports on regulators have a tiny orifice, in order to prevent rapid loss of air if a hose or SPG fails. These ports cannot provide the sort of flow you would want. </span></font><div><span style="color:rgb(38,40,42);"><font face="arial, sans-serif" style="background-color: inherit;"><br clear="none"></font></span></div><div><span style="color:rgb(38,40,42);"><font face="arial, sans-serif" style="background-color: inherit;">Best,</font></span></div><div><span style="color:rgb(38,40,42);"><font face="arial, sans-serif" style="background-color: inherit;">Alec</font></span></div></div></div></div><br clear="none"><div class="ydp143b72b6yiv0013572975gmail_quote"><div id="ydp143b72b6yiv0013572975yqt99075" class="ydp143b72b6yiv0013572975yqt7775404972"><div dir="ltr" class="ydp143b72b6yiv0013572975gmail_attr">On Tue, Aug 1, 2023 at 12:17 PM Cliff Redus via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;" class="ydp143b72b6yiv0013572975gmail_quote"><div><div style="font-family:new times, serif;font-size:16px;"><div style="font-size:16px;font-family:new times, serif;"></div>
<div dir="ltr">Sean, the specs do look good on this unit. To me the issue is going to be the cost. As background, the Parker regulator that Hugh, Alec and I have used for this application is the <span style="font-size:16px;font-family:new times, serif;"><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;">364-02BSS/M1 Parker Watts Pneumatic Regulator.</span></span><div style="font-size:16px;font-family:new times, serif;"><div><br clear="none"></div><div dir="ltr"><a shape="rect" href="https://store.livhaven.com/r364-02bss-m1-watts-fluidair-pneumatic-regulator" rel="nofollow" target="_blank">https://store.livhaven.com/r364-02bss-m1-watts-fluidair-pneumatic-regulator</a> at $217.51. I purchased mine off ebay for a fraction of this.<br clear="none"></div></div><div dir="ltr" style="font-size:16px;font-family:new times, serif;"><br clear="none"></div><div dir="ltr">When I had the Parker <span style="font-size:16px;font-family:Helvetica, Arial, sans-serif;color:rgb(38,40,42);">364-02BSS/M1 </span>installed for pressure compensating for my four MK 101s, it was connected to the LP port from my AquaLung Titan balanced diaphragm first stage regulator. I had the <span><span style="color:rgb(0,0,0);font-family:new times, serif;font-size:16px;">Parker </span><font color="#26282a" face="Helvetica Neue, Helvetica, Arial, sans-serif" style="background-color:inherit;">364-02BSS/M1 adjusted to give about 2 psi over ambient.</font></span> I had the first stage set to 50 psi over ambient water pressure. I use this for BIBBS and blowing the MBTs. </div><div dir="ltr"><br clear="none"></div><div dir="ltr">The <span><font color="#26282a" face="Helvetica Neue, Helvetica, Arial, sans-serif" style="background-color:inherit;">Tescom 44-4069 regulator would run directly off the HP air tank pressure then output go directly to thrusters. It would be interesting to compare the Cv's for both regulators to get a feel on how much air flow rate they can provide to the thrusters descending and venting when ascending. </font></span></div><div dir="ltr"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;"><br clear="none"></span></span></div><div dir="ltr"><span><font color="#26282a" face="Helvetica Neue, Helvetica, Arial, sans-serif" style="background-color:inherit;">The Tescom 44-4069 regulator would be a clean installation with just a single 1/4 SS tubing run from the HP port of the 1st stage regulator to the input port of Tescom 44-4069 regulator. From the output port of the Tescom 44-4069 a single 1/4 SS tubing to a Swagelok Tee that branched off to two more "T"s to give four 1/4 SS tubing runs to the thrusters.</font><br clear="none"></span></div><div dir="ltr"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;font-size:16px;"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;font-size:16px;"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;font-size:16px;"><br clear="none"></span></span></span></span></span></span></span></span></div><div dir="ltr"><span><font color="#26282a" face="Helvetica Neue, Helvetica, Arial, sans-serif" style="background-color:inherit;">We need to get a RFQ on one of these regulators. Do you have a preferred supplier?</font></span></div><div dir="ltr"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;"><br clear="none"></span></span></div><div dir="ltr"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;">Cliff</span></span></div><div dir="ltr"><span><span style="color:rgb(38,40,42);font-family:Helvetica, Arial, sans-serif;"><br clear="none"></span></span></div></div><div style="font-size:16px;font-family:new times, serif;"><br clear="none"></div>
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On Monday, July 31, 2023 at 09:47:29 PM CDT, Sean T. Stevenson via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="ydp143b72b6yiv0013572975m_415620457726932623ydp81ec12b4yiv4171593328"><div dir="ltr">I would be inclined to use a Tescom 44-4069 regulator for this purpose. Not sure what these sell for.<br clear="none"><br clear="none">Sean</div><div dir="ltr"><br clear="none"></div><div dir="ltr"><br clear="none"><br clear="none">-------- Original Message --------<br clear="none">On Jul. 31, 2023, 20:37, Cliff Redus via Personal_Submersibles < <a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<blockquote><br clear="none"></blockquote></div><div id="ydp143b72b6yiv0013572975m_415620457726932623ydp81ec12b4yiv4171593328yqt09435"><div>My original air competition for the R300 used the regulator that Hugh Fulton has on QSub. These are pricey new but you can get them used on eBay. I was operating all four of my Minn kotas 101 off this single regulator. It was a special ss pressure reducing/pressure releasing regulator. I had it installed on my last Florida dive which I went down about 100 ft . Unit worked fine. My first failure was on Flathead lake expedition in which one of my aft thrusters flooded. After that I switched to oil compensation. Alec is using same regular on his articulated arm and not the thrusters. He felt issue with the regulator was that the port for releasing pressure on ascent was too small. I believe he has addressed this by adding a pressure release valve or OP valve. He can elaborate more on his current strategy.<div><br clear="none"></div><div>Cliff<br clear="none"><br clear="none"><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br clear="none"><blockquote type="cite">On Jul 31, 2023, at 9:14 PM, Alan James via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></blockquote></div><blockquote type="cite"><div dir="ltr">John,<div>I am happy with both air & oil. </div><div>Am intending to fill my thrusters with oil, but have the oil pressurized off my air comp system. This will reduce air use to just whats in the lines.</div><div>My electric manipulator will be air compensated off the same unit. Putting oil in it adds another layer of complexity.</div><div>I think I need to put out a long video once I've finished this</div><div>air compensator.</div><div>From what I am hearing from Cliff, he didn't get enough air delivery from the single regulator he was using. However I thought this was the same unit that Alec is using & was now happy with.</div><div>Alan</div><div><br clear="none"><br clear="none"><div id="ydp143b72b6yiv0013572975m_415620457726932623ydp81ec12b4yiv4171593328ymail_android_signature"><a shape="rect" id="ydp143b72b6yiv0013572975m_415620457726932623ydp81ec12b4yiv4171593328ymail_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:0px 0px 20px;"> <div style="font-family:Roboto, sans-serif;color:rgb(109,0,246);"> <div>On Tue, 1 Aug 2023 at 1:29 pm, Jon Wallace via Personal_Submersibles</div><div><<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:</div> </div> <div style="padding:10px 0px 0px 20px;margin:10px 0px 0px;border-left:1px solid rgb(109,0,246);"> _______________________________________________<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> </blockquote></div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a shape="rect" href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><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></span><br clear="none"></div></blockquote></div></div></div></div><div id="ydp143b72b6yiv0013572975m_415620457726932623ydp81ec12b4yqt25870">_______________________________________________<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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