<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_ym18_1_1459219487942_2577"><span>Hugh,</span></div><div id="yui_3_16_0_ym18_1_1459219487942_2633" dir="ltr"><span id="yui_3_16_0_ym18_1_1459219487942_2639">thanks for the comments on the bearings. </span></div><div id="yui_3_16_0_ym18_1_1459219487942_2632" dir="ltr"><span id="yui_3_16_0_ym18_1_1459219487942_2631">I went in to Saeco to try & find what axial load the bearings in my motor could take.</span></div><div id="yui_3_16_0_ym18_1_1459219487942_2640" dir="ltr"><span id="yui_3_16_0_ym18_1_1459219487942_2648">They put me on to NSK's head engineer.</span></div><div id="yui_3_16_0_ym18_1_1459219487942_2630" dir="ltr"><span id="yui_3_16_0_ym18_1_1459219487942_2629">The bearings were a 6800Z deep grove ball bearing, & although they could take the load, their </span><span id="yui_3_16_0_ym18_1_1459219487942_2646">life expectancy was less than 60 hrs at 50lb thrust. </span></div><div id="yui_3_16_0_ym18_1_1459219487942_2735" dir="ltr"><span id="yui_3_16_0_ym18_1_1459219487942_2734">He initially suggested an angular contact bearing, but because of the tight machining </span></div><div id="yui_3_16_0_ym18_1_1459219487942_2728" dir="ltr"><span id="yui_3_16_0_ym18_1_1459219487942_2733">tolerances required changed this to a larger deep groove ball bearing. (6000)</span></div><div id="yui_3_16_0_ym18_1_1459219487942_2730" dir="ltr"><span id="yui_3_16_0_ym18_1_1459219487942_2729">So the bearings in the motor will stay there but I'll have the suggested bearings pressed</span></div><div id="yui_3_16_0_ym18_1_1459219487942_2731" dir="ltr"><span id="yui_3_16_0_ym18_1_1459219487942_2732">in to the housing either end of the motor with the propeller shaft running through them to take forward & reverse thrust axial load.</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym18_1_1459219487942_2510">Cheers Alan<br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym18_1_1459219487942_2748" style="display: block;"> <div id="yui_3_16_0_ym18_1_1459219487942_2747" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym18_1_1459219487942_2746" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym18_1_1459219487942_2745" dir="ltr"> <font id="yui_3_16_0_ym18_1_1459219487942_2750" face="Arial" size="2"> <hr size="1" id="yui_3_16_0_ym18_1_1459219487942_2749"> <b id="yui_3_16_0_ym18_1_1459219487942_2759"><span id="yui_3_16_0_ym18_1_1459219487942_2758" style="font-weight: bold;">From:</span></b> Hugh Fulton via Personal_Submersibles <personal_submersibles@psubs.org><br> <b id="yui_3_16_0_ym18_1_1459219487942_2757"><span id="yui_3_16_0_ym18_1_1459219487942_2756" 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> Friday, March 25, 2016 6:20 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym18_1_1459219487942_2848"><br><div id="yiv9623402152"><style>#yiv9623402152 #yiv9623402152 --
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#yiv9623402152 </style><div id="yui_3_16_0_ym18_1_1459219487942_2847"><div class="yiv9623402152WordSection1" id="yui_3_16_0_ym18_1_1459219487942_2846"><div class="yiv9623402152MsoNormal"><span style="font-size: 11pt;">Alan,</span></div><div class="yiv9623402152MsoNormal"><span style="font-size: 11pt;">I was working through all the emails and didn’t see this one which explains things a bit better but thrust bearings tend to be one direction. If you are using reverse then you may need another.</span></div><div class="yiv9623402152MsoNormal"><span style="font-size: 11pt;">Hugh</span></div><div class="yiv9623402152MsoNormal"><span style="font-size: 11pt;"> </span></div><div><div style="border-width: 1pt medium medium; border-style: solid none none; border-color: rgb(181, 196, 223) currentColor currentColor; padding: 3pt 0cm 0cm; border-image: none;"><div class="yiv9623402152MsoNormal"><b><span style="font-size: 10pt;">rom:</span></b><span style="font-size: 10pt;"> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org] <b>On Behalf Of </b>Alan James via Personal_Submersibles<br clear="none"><b>Sent:</b> Friday, 25 March 2016 12:24 p.m.<br clear="none"><b>To:</b> Personal Submersibles General Discussion<br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster</span></div></div></div><div class="yiv9623402152MsoNormal"> </div><div class="yiv9623402152yqt5475571766" id="yiv9623402152yqt61370"><div id="yui_3_16_0_ym18_1_1459219487942_2845"><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3054"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Hi Steve,</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3122"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">sorry, I left a bit of detail out of that drawing.</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3265"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Firstly the motor is an outrunner; so the back section with wires coming out is stationary</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3263"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">as are the coils inside, but the rest of the can, with magnets, rotates.</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3088"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">The motor has a thrust bearing in it, and that takes the forward load from the propeller.</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3076"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">There will be a circlip on the propeller shaft that will run against the bearing shown,</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3151"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">when in reverse. The motor comes with 4 threaded holes in the back for mounting.</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3188"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">I am putting 4 pins in these that will locate in 4 holes in the rear section of the thruster</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3286"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">housing. The pins will only centralize the motor & stop the back section of the motor </span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3284"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">rotating. The whole motor could move laterally on the pins when going from forward to reverse</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3422"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">but with a tight tolerance this shouldn't be a problem.</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3441"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> I am replacing the propeller shaft with 316 SS as I did in the last version. The factory that</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3580"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">supplied the motor kindly sent it disassembled to facilitate this. They normally Loctite everything.</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3574"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> The wiring tube takes the 3 phase wires + 6 hall sensor & 2 heat sensor wires. I may add</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3617"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">a water sensor in the bottom tube. The wires in the last version came out through a hose</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3619"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">connector fitting that was press fitted in with Loctite and had a clear plastic hose clamped to it. </span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3314"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">I like this, as the oil for compensation also runs in it & the clear hose is a level indicator. </span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3743"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">I will send the wiring through a penetrator at the hull.</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3769"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Cheers Alan</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3103"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_2980"><div class="yiv9623402152MsoNormal" style="background: white; margin-bottom: 12pt;"><span style="color: black; font-family: helveticaneue;"> </span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_2984"><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_2983"><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_2982"><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_2981"><div align="center" class="yiv9623402152MsoNormal" style="background: white; text-align: center;"><span style="font-size: 10pt;"></span><hr width="100%" size="1" align="center"></div><div class="yiv9623402152MsoNormal" style="background: white;"><b id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3149"><span style="font-size: 10pt;">From:</span></b><span style="font-size: 10pt;"> Stephen Fordyce via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"><b id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3125">Sent:</b> Friday, March 25, 2016 11:06 AM<br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster</span><span style="color: black; font-family: helveticaneue;"></span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3108"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div><div id="yiv9623402152"><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3111"><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3110"><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3109"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Hi Alan,</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3452"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">That looks great! Very small for the power. A couple of comments/queries:</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3451"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">- There's no second bearing or thrust bearing - perhaps these are not shown?</span></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3461"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">- Just wondering how the wiring tube is connected? Ie. tapped hole for a cable gland or compression fitting?</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">- How is the motor held in place within the housing?</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">- I'm guessing the motor has a carbon steel shaft and the external propeller shaft should be SS316 - are you going to weld them together or connect mechanically?</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Cheers,</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Steve</span></div></div></div><div id="yiv9623402152yui_3_16_0_ym18_1_1458857069959_3464"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div><div id="yui_3_16_0_ym18_1_1459219487942_2844"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">On Fri, Mar 25, 2016 at 8:13 AM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span></div><div id="yiv9623402152yqt71257"><div id="yui_3_16_0_ym18_1_1459219487942_2843"><div id="yui_3_16_0_ym18_1_1459219487942_2842"><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">OK Hank I will bolt the front section on.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">I had problems machining the bearing seat on the first thruster as the </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">front section was one piece & I needed a long boring tool. I will have the </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">same trouble if I have to machine these after welding. I will probably</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">loc-tite everything in on the front section as it doesn't need to come apart.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">The whole thruster housing (2000W) is only 80mm x 174mm (3&1/4" X 7")</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">& there is very little to it.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Are you planning any other submarine events in Europe apart from visiting Emile?</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">I went up to Cherbourg & had a look at the submarine museum. You could spend</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">a day there, I am sure your wife would love it.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Cheers Alan</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white; margin-bottom: 12pt;"><span style="color: black; font-family: helveticaneue;"> </span></div></div><div id="yui_3_16_0_ym18_1_1459219487942_2841"><div id="yui_3_16_0_ym18_1_1459219487942_2840"><div id="yui_3_16_0_ym18_1_1459219487942_2839"><div><div align="center" class="yiv9623402152MsoNormal" style="background: white; text-align: center;"><span style="color: black; font-family: helveticaneue;"></span><hr width="100%" size="1" align="center"></div><div class="yiv9623402152MsoNormal" style="background: white;"><b><span style="color: black; font-family: helveticaneue;">From:</span></b><span style="color: black; font-family: helveticaneue;"> hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"><b>Sent:</b> Friday, March 25, 2016 9:05 AM</span></div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"><br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster</span></div></div></div></div><div id="yui_3_16_0_ym18_1_1459219487942_2838"><div id="yui_3_16_0_ym18_1_1459219487942_2837"><div id="yui_3_16_0_ym18_1_1459219487942_2836"><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div><div><div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;">Alan,</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;">I like the two seals also and now that you mention you are putting in a fill plug to vent air-I am with you. I would get it welded before you machine the bearing seats etc, if possible.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;">I would still make both ends bolt together-there is nothing like having it come apart to work on it. My Perry thrusters break down into a million pieces and it is real nice to work on.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;">Hank</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white; margin-bottom: 12pt;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;"> </span></div></div><div><div><div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="font-size: 10pt;">On Thursday, March 24, 2016 1:55 PM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><span style="color: black; font-family: helveticaneue;"></span></div></div><div class="yiv9623402152MsoNormal" style="background: white; margin-bottom: 12pt;"><span style="color: black; font-family: helveticaneue;"> </span></div><div><div><div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Hank,</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">I left out some details on that drawing. The back end fits the same</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">as the front & has a radial o-ring seal on the end housing & 6 cap screws that</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">bolt in to the central housing. </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Alan</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white; margin-bottom: 12pt;"><span style="color: black; font-family: helveticaneue;"> </span></div></div><div><div><div><div><div><div align="center" class="yiv9623402152MsoNormal" style="background: white; text-align: center;"><span style="color: black; font-family: helveticaneue;"></span><hr width="100%" size="1" align="center"></div><div class="yiv9623402152MsoNormal" style="background: white;"><b><span style="color: black; font-family: helveticaneue;">From:</span></b><span style="color: black; font-family: helveticaneue;"> hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"><b>To:</b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"><b>Sent:</b> Friday, March 25, 2016 1:31 AM<br clear="none"><b>Subject:</b> Re: [PSUBS-MAILIST] MK 2 Brushless Thruster</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div><div><div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;">Hi Alan,</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;">It wouldn't hurt to clamp the end cap tight but you do have a nice shoulder for the end cap to sit on. Any time I make a part that can and usually does warp, I make it oversize and machine it true after welding. I am curious why you want to weld it-that big shoulder has room for an o-ring. I would also ditch the second seal-it is an air trap. Great project!</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;">Hank</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white; margin-bottom: 12pt;"><span style="color: black; font-family: helveticaneue; font-size: 9pt;"> </span></div></div><div><div><div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="font-size: 10pt;">On Thursday, March 24, 2016 12:27 AM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:</span><span style="color: black; font-family: helveticaneue;"></span></div></div><div class="yiv9623402152MsoNormal" style="background: white; margin-bottom: 12pt;"><span style="color: black; font-family: helveticaneue;"> </span></div><div><div><div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">This is my latest brushless thruster design for scrutiny.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">The last thruster I made was 2 piece with one seal.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">I machined the last version out of aluminum rod, which was expensive & difficult.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">The end pieces in this design are from solid rod but the mid section is from a stock tube</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">that I intend to have welded to the propeller end. The back end is bolted on.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Am I likely to get distortion when welding the two sections together? There is a sleeve</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">press fitting to help give it some rigidity for welding. Should I make a jig to clamp it in</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">for welding?</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">The thruster is for 500ft depth & is oil filled with a slight over pressure above ambient. </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Oil filled mainly for cooling purposes, but also as a secondary defense against any leaks,</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">& for lubrication of bearings & seals. I am using low pressure lip seals & have a double </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">seal redundant arrangement. The outboard seal is orientated to keep the oil in & with the</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">internal overpressure should keep the water out. The outboard seal should fail first as it is </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">exposed to abrasives, especially in sea water. The inboard seal is oriented so that it keeps</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">any water out that may get past the outboard seal. </span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">The tube coming out of the seal cavity is for pressurizing it & for collecting any water that</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">may get through & come out of suspension. I am thinking of putting a water sensor in there.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Any comments welcome.</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">Alan</span></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;">p.s. if image isn't big enough keep hitting ctrl & + TO ENLARGE.</span></div></div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div></div><div><div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"></span></div></div></div></div><div><div class="yiv9623402152MsoNormal" style="background: white;"><span style="color: black; font-family: helveticaneue;"> </span></div></div></div></div></div></div><div class="yiv9623402152MsoNormal" style="background: white; 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