<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt"><div><span>Cliff,</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>a couple of more thoughts....</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>If you fitted an elbow in the bottom of the motor for the air compensation line</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>you would have a water purge function
when ascending as Emile said he was doing.</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>Hopefully it's not necessary.</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>The other thought is that depending on how you ran your air compensation system</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>lines, you could easily change to an oil comp system if the motors were getting too hot</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>or you felt it necessary or even just wanted to experiment to check the difference in power.</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>The air compensating regulators would keep the oil at an over pressure & the air in the lines</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>to the motor would take up any oil expansion.</span></div><div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style:
normal; background-color: transparent;"><span>Alan</span></div><div><br></div> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 10pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Cliff Redus via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, July 29, 2014 8:50 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK-101 Connectors<br> </font> </div> <div class="y_msg_container"><br><div id="yiv2920281469"><div><div style="color: rgb(0, 0, 0); font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);"><div><span></span></div><div></div><div>Alan, I am leaning towards using the Subconn BHB2M bulkhead fitting for my MK-101's even with the 25A limitation noted by vendor if we confirm 25A is the limit for both pins.</div><div><br clear="none"></div><div>My argument is that this is a general purpose wet matable bulkhead connector. Vendor has to protect itself from generally ignorant population that do stupid things. As such, I am sure they have conducted many worst case tests including 150-200% fully loaded of this 25A limit with the conductor in the air as apposed to submerged for days on end. </div><div><br clear="none"></div><div>In my case, I plan on using the motor controller that MK supplies for 36V systems and the MK resettable circuit breaker they recommend for the 101 lower units. MK
recommends in the paperwork that comes with the lower unit not to run in the air for more than 2 minutes. The MK motor controller is very nice. It works off a 0-5VDC potentiometer with a large deadband around 2.5V. This motor controller has a soft start built in so full on at 0 or 5 vdc causes the motor to ramp up over about 2 seconds or so. Like wise full reversal of potentiometer causes the motor to ramp down then ramp up. This soft start capability is designed to limit high initial current load that it would see if you just connect motor directly to battery bank. Also these controllers are potted.</div><div><br clear="none"></div><div>The second point that makes the BHB2M work for this application is that it is installed on the thruster so that if the thruster is submerged, and if a prop is installed, ambient water is cooling both the motor and the connector. Also our duty
cycle is
light.</div><div><br clear="none"></div><div>Could you fail this connector by overheating. Yes, don't use circuit protection, don't use motor controllers with a soft start, run the motor in air for long periods of time. </div><div><br clear="none"></div><div>As long as you use a bit of common sense, this connector which has 10 AWG pins which is the wire size recommended by the MK for their 101 lower unit, it should work just fine.</div><div><br clear="none"></div><div>If someone can identify the same basic bulkhead connector with say 8 AWG pins that does not cost $2000 per connector, we of course should look at this but I for one am comfortable that for my application this will work IF the cost is reasonable.</div><div><br clear="none"></div><div>Cliff</div><div><br clear="none"><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; font-size: 12pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div class="qtdSeparateBR"><br><br></div><div class="yiv2920281469yqt9387217784" id="yiv2920281469yqt16764"><div dir="ltr"> <div style="margin:5px 0px;padding:0px;border:1px solid rgb(204, 204, 204);height:0px;line-height:0;font-size:0px;"></div> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Alan James via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Monday, July 28, 2014 4:13 PM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK-101 Connectors<br clear="none"> </font> </div>
<div><br clear="none"><div id="yiv2920281469"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 10pt; background-color: rgb(255, 255, 255);"><div><span>Cliff, </span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>you had to go all the way over there, what a long haul.</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span> I am quoting this from advice I had years ago & I think it was from one of their reps.</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>From what I remember, it was the combined heat from the 2 wires in the connector </span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>that was the determining factor.</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>I will send them an email & post the
results.</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;">Alan</div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span><br clear="none"></span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span><br clear="none"></span></div><div><br clear="none"></div> <div style="font-family:HelveticaNeue,;"> <div style="font-family:HelveticaNeue,;"> <div id="yiv2920281469yqt14694"><div dir="ltr"> <div style="margin:5px 0px;padding:0px;border:1px solid rgb(204, 204, 204);height:0px;line-height:0;font-size:0px;"></div> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Clifford Redus via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General
Discussion <personal_submersibles@psubs.org> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Monday,
July 28, 2014 7:48 PM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK-101 Connectors<br clear="none"> </font> </div> <div><br clear="none"><div id="yiv2920281469"><div><div>We need some clarification on this. I am reading this as this connector will handle 25 amps per pin so with a FS 2 we are probably good.</div><div><br clear="none"></div><div>I have had no time to look at this as in Perth on business.<br clear="none"><br clear="none"><br clear="none"><div>Cliff</div></div><div><br clear="none"><br clear="none"></div><div id="yiv2920281469yqt88246"><div><br clear="none">On Jul 28, 2014, at 3:08 PM, Alan James 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 style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><div><span>Hi Cliff,</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>as I understand it the connector amp rating is 25 amps for the 2 pin unit.</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>That means 12.5 amps per pin, which is about 1/4 of what you want.</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>Cheers Alan</span></div><div><br clear="none"></div> <div style="font-family:HelveticaNeue,;"> <div style="font-family:HelveticaNeue,;"> <div dir="ltr"> <div style="margin:5px 0px;padding:0px;border:1px solid rgb(204, 204, 204);height:0px;line-height:0;font-size:0px;"></div> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Clifford Redus 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>><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General
Discussion <<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"> <b><span style="font-weight:bold;">Sent:</span></b> Monday, July 28, 2014 6:51 PM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK-101 Connectors<br clear="none"> </font> </div> <div><br clear="none"><div id="yiv2920281469"><div><div>I think there is a big factor of safety. You get
the same issue when you look at agency's specs on how much current a 10awg wire can handle. Having said that MK sells there lower units with 10 awg wire. US coast guard would have 6 awg for this current.</div><div><br clear="none"></div><div>This needs to be looked at but my guess is that this will handle it.<br clear="none"><br clear="none"><br clear="none"><div>Cliff</div></div><div><br clear="none"><br clear="none"></div><div id="yiv2920281469yqt30002"><div><br clear="none">On Jul 28, 2014, at 12:48 PM, Alan James 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 style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><div><span>Cliff,</span></div><div style="color:rgb(0, 0,
0);font-family:HelveticaNeue,;"><span>what about the max contact amp ratings on those connnectors?</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>I thought you said you needed something that could take 46 amps.</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span>Alan</span></div><div><br clear="none"></div> <div style="font-family:HelveticaNeue,;"> <div style="font-family:HelveticaNeue,;"> <div dir="ltr"> <div style="margin:5px 0px;padding:0px;border:1px solid rgb(204, 204, 204);height:0px;line-height:0;font-size:0px;"></div> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Clifford Redus 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>><br clear="none"> <b><span style="font-weight:bold;">To:</span></b>
Personal Submersibles General Discussion <<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"> <b><span style="font-weight:bold;">Sent:</span></b> Monday, July 28, 2014 4:20 PM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK-101 Connectors<br clear="none"> </font> </div> <div><br clear="none"><div id="yiv2920281469"><div><div>Jon, a BHB2M to me looks about right. 10AWG pins to match
the 10AWG for the MK-101.</div><div><br clear="none"></div><div><br clear="none"></div><div>The port on the MK-101 is 1-1/8 x 18 So it would be easy to machine an adaptor to accept this 5/8-18 male BH fitting.</div><div><br clear="none"></div><div>Can you get a price on these with the Psub discount?</div><div><br clear="none"></div><div>There probably enough space to drill a 1/16 hole in this machined part and connect a 1/4" Swagelok fitting perpendicular to the axis to connect an air compensation connection if you did not want to drill and tap into body of MK-101.</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div>Cliff<br clear="none"><br clear="none"><br clear="none"><div>Cliff Redus</div></div><div><br clear="none"><br clear="none"></div><div id="yiv2920281469yqt92166"><div><br clear="none">On Jul 28, 2014, at 11:06 AM, Jon
Wallace 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 id="yiv2920281469yqt15865"><div><div><br clear="none">
Agreed, but we should take advantage of our SUBCONN discount if we
can. What about this one...<br clear="none">
<a rel="nofollow" shape="rect" target="_blank" href="http://www.subconn.com/connectors/power-series/power-series-battery-2-contacts">http://www.subconn.com/connectors/power-series/power-series-battery-2-contacts</a><br clear="none">
<br clear="none">
Jon<br clear="none">
<br clear="none">
<br clear="none">
<br clear="none">
On 7/27/2014 6:00 PM, Clifford Redus via Personal_Submersibles
wrote:<br clear="none">
</div>
<blockquote type="cite">
</blockquote></div></div><div><div id="yiv2920281469yqt76989"><div>Since so many of us are using or planning on using MK-101s
either air or oil compensated, it would be nice if we could move
towards a standard connector. These thrusters are 36v with max
current of 46 amps. The lower unit comes with two 10 AWG wires.</div>
<div><br clear="none">
</div>
<div>It would be nice if the connector was a male bulk head
connector with two power pins and one alignment pin. </div>
<div><br clear="none">
</div>
<div>Could go with an off the shelf connector like an impulse
HDBH-2-MP but these are expensive as rated for depth. In our
case since we are pressure compensating this is overkill. </div>
<div><br clear="none">
</div>
<div>For those of you that have MK-101 or MK-80 thrusters, what
type of connectors are you using?</div>
<div><br clear="none">
</div>
<div>Like Vance, I am planning to have a spare that could be
swapped out in the field.</div>
<div><br clear="none">
</div>
<div>Cliff</div></div>
<br clear="none">
<br clear="none">
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