<div>One thing i did think about being a possible idea is a moveable weight that can be cranked back and forth to adjust trim, a bit like you have on a plane. Would be quite easy to do and would be handy for fine tuning trim. Would need another through hull though. Another winter modification maybe.</div>
<div>Regards<br>James<br><br></div>
<div class="gmail_quote">On 13 June 2014 03:15, swaters via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br>
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<div>
<div>That is one way of fixing it. A bigger line would help prevent it some times, but not 100%. Dan's solution works well. It isn't a major problem with the K-350 design, just more a pain in the butt.</div>
<div>
<div>Thanks,</div>
<div>Scott Waters</div>
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<div style="COLOR:#575757;FONT-SIZE:75%">Sent from my U.S. Cellular© Smartphone</div></div><br></div>
<div>
<div class="h5">Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br>
<div style="BACKGROUND-COLOR:#fff;FONT-FAMILY:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;COLOR:#000;FONT-SIZE:10pt">
<div><span>OK thanks I see now.</span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span>So if the ballast tank air fill was on a T in the ballast vent line, just below the </span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span>ballast valve, that would blow the water out when surfacing & solve the problem?</span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span style="BACKGROUND-COLOR:transparent">Alan</span><br>
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<font face="Arial"><b><span style="FONT-WEIGHT:bold">From:</span></b> swaters via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br><b><span style="FONT-WEIGHT:bold">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> <br>
<b><span style="FONT-WEIGHT:bold">Sent:</span></b> Friday, June 13, 2014 1:41 PM<br><b><span style="FONT-WEIGHT:bold">Subject:</span></b> Re: [PSUBS-MAILIST] Bouyancy<br></font></div>
<div><br>
<div>
<div>
<div>Alan,</div>
<div>It normally happens after the first dive and water gets trapped in the line. The gravity pulling the water is counteracted on by the pressure in the MBT pussing the water up therefore the water is trapped not letting the air out of the MBT.</div>
<div>Thanks,</div>
<div>Scott Waters</div>
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<div>
<div style="COLOR:#575757;FONT-SIZE:75%">Sent from my U.S. Cellular© Smartphone</div></div><br clear="none">Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none">
<div><br><br></div>
<div>
<div style="BACKGROUND-COLOR:rgb(255,255,255);FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:10pt">
<div><span>Dan / Scott,</span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span>I'm a bit puzzled by this.</span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span>There wouldn't be water in the line initially unless the valve exit was facing upward & rain </span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span>or wave splash entered it. Does water enter in as the sub bobbles about & the ballast</span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span>air exit dips below the water? I guess then the water in the line would be held in place</span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span>by the small air pressure in the ballast tank, which wouldn't be enough to </span><span style="BACKGROUND-COLOR:transparent">force the water up & out, </span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span style="BACKGROUND-COLOR:transparent">but is enough to hold it in position.</span></div>
<div style="BACKGROUND-COLOR:transparent;FONT-STYLE:normal;FONT-FAMILY:HelveticaNeue,'Helvetica Neue',Helvetica,Arial,'Lucida Grande',sans-serif;COLOR:rgb(0,0,0);FONT-SIZE:13px"><span style="BACKGROUND-COLOR:transparent">Alan</span></div>
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<font face="Arial"><b><span style="FONT-WEIGHT:bold">From:</span></b> Dan H. via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br clear="none">
<b><span style="FONT-WEIGHT:bold">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> <br clear="none"><b><span style="FONT-WEIGHT:bold">Sent:</span></b> Friday, June 13, 2014 3:03 AM<br clear="none">
<b><span style="FONT-WEIGHT:bold">Subject:</span></b> Re: [PSUBS-MAILIST] Bouyancy<br clear="none"></font></div>
<div><br clear="none">
<div>
<div>
<div><font face="Arial">Scott, </font></div>
<div><font face="Arial">To clear the lines, I screwed a T onto each of the through hulls that feed air to the MBTs. (on the open end under the MBTs) Then I fashioned a piece of copper tubing that directs a stream of air right into the MBT vent line but not actually connected to it. I put a restriction in the other end of the T to create enough back pressure so the tubing emits a pretty good blast of air directed at the vent port. </font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">To vent the MBTs, I open the conning tower vent valves then give the tank blow valve a turn till I see the water blow up and out the vents. That seems to clear the lines and then it vents properly. </font></div>
<div><font face="Arial"> It's not a great fix but it works.</font></div>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px">
<div style="FONT:10pt arial">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:rgb(228,228,228)"><b>From:</b> <a title="personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" shape="rect" rel="nofollow" target="_blank">swaters via Personal_Submersibles</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a title="personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" shape="rect" rel="nofollow" target="_blank">Personal Submersibles General Discussion</a> </div>
<div style="FONT:10pt arial"><b>Sent:</b> Wednesday, June 11, 2014 10:37 PM</div>
<div style="FONT:10pt arial"><b>Subject:</b> Re: [PSUBS-MAILIST] Bouyancy</div>
<div><br clear="none"></div>
<div>Dan,</div>
<div>I have the exact same problem with hydrolocking in the vents. I have to open the hatch and blow the water out with my mouth. Pain in the butt.</div>
<div>Thanks,</div>
<div>Scott Waters</div>
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<div style="COLOR:#575757;FONT-SIZE:75%">Sent from my U.S. Cellular© Smartphone</div></div><br clear="none">"Dan H. via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org" shape="rect" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none">
<div>If I were to do mine over again, I wouldn't vent it as it is in the plans. Instead of running piping from the MBTs to the conning tower, I would run linkage, and have the actual valves mounted on the MBT. </div>
<div> </div>
<div>Besides slow venting, my biggest problem is getting water in the piping that won't escape to let the air come through when venting. A homemade mushroom valves made from bathroom sink drains controlled by linkage going to the conning tower, or anywhere easy to reach in the hull, would solve all the problems. </div>
<div> </div>
<div>My thought, Dan H.</div>
<blockquote style="BORDER-LEFT:#000000 2px solid;PADDING-LEFT:5px;PADDING-RIGHT:0px;MARGIN-LEFT:5px;MARGIN-RIGHT:0px">
<div style="FONT:10pt arial">----- Original Message ----- </div>
<div style="FONT:10pt arial;BACKGROUND:rgb(228,228,228)"><b>From:</b> <a title="personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" shape="rect" rel="nofollow" target="_blank">via Personal_Submersibles</a> </div>
<div style="FONT:10pt arial"><b>To:</b> <a title="personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" shape="rect" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a> </div>
<div style="FONT:10pt arial"><b>Sent:</b> Wednesday, June 11, 2014 9:53 PM</div>
<div style="FONT:10pt arial"><b>Subject:</b> Re: [PSUBS-MAILIST] Bouyancy</div>
<div><br clear="none"></div><font color="#000000" face="Arial"></font>
<div><font size="3">Scott, Alec, Vance, and all,</font></div>
<div><font size="3"></font> </div>
<div><font size="3">A 3/4" vent is going to be about 2.25 times as big in cross section as the 1/2" vent. A 1" vent would be about 4 times as big as the 1/2". What are your thoughts/comments on 3/4", 1" or any other size vent vs another?</font></div>
<div> </div>
<div><font size="3">Thanks,</font></div>
<div><font size="3">Jim </font></div>
<div> </div>
<div>
<div>In a message dated 6/11/2014 5:45:10 P.M. Central Daylight Time, <a href="mailto:personal_submersibles@psubs.org" shape="rect" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a> writes:</div>
<blockquote style="BORDER-LEFT:blue 2px solid;PADDING-LEFT:5px;MARGIN-LEFT:5px"><font style="BACKGROUND-COLOR:transparent" color="#000000" face="Arial"></font>
<div>James,</div>
<div>I totally agree with you on the 1/2 inch vents being way to small. Eventually I am going to switch mine out to 3/4"</div>
<div>Thanks,</div>
<div>Scott Waters</div>
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<div style="COLOR:#575757;FONT-SIZE:75%">Sent from my U.S. Cellular© Smartphone</div></div><br clear="none">James Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none">
<div>Hi All,</div>
<div> </div>
<div>A member has asked me to post a description of what was going on with bouyancy on my dive. Which was as follows:</div>
<div> </div>
<div>I'd asked the crane driver to be prepared for the first dive to hold me just below the surface as i was expecting to be a little out of control. </div>
<div> </div>
<div>At first, i got a bubble stuck in the forward tank. Ive put quite a large lip on the inside of the tanks in an attempt to cope with Guernsey seas. I could see the bubble stuck through the forward dome and i squished myself right up into the front to try and force it a bit more level so it could escape out of the vent. It didnt make any difference and then all the lead i had inside, slid along the deck right to the back, making the entire situation worse. Closed vents, blew mains and re-surfaced.</div>
<div> </div>
<div>Next attempt, i got the bubble stuck in the aft tank. This wasnt as bad because the motor cut away allows air to escape so i got under a little further, but not enough. I flooded the variable in an attempt to get under. Still no good, so i asked the divers to shove on the back. This got the boat under, but then because of the total lack of air in any tanks, i sank to the bottom like a stone. Depth was 6m (20ft). I expected to stop on the crane ropes, but the driver must have misunderstood me and before i knew it, the bottom was in sight and then i was down with a gentle bump. </div>
<div> </div>
<div>I sat for a bit talking to my brother on the radio and then shut the variable vent and pumped a little air into the tank. I slowely started to rise. Flooded it again and started to sink. Really quite straight forward. </div>
<div> </div>
<div>Blowing the VBT completely brought me up fairly quickly until i seemed to be just awash with the surface. Filling the mains then brought me right out. </div>
<div> </div>
<div>I did several more test dives after that and as long as i evened out the venting of the main tanks to avoid the bubbles, i could dive without the divers assistance. </div>
<div> </div>
<div>I next got the boat neutral just off the bottom and then used the motors to drive up and down. I was not aware at the time that one motor was not working but it still seemed quite responsive and i could drive all the way up to the top or down to the bottom, stopping anywhere in between.</div>
<div> </div>
<div>I need to add some extra vents to the main tanks to prevent the air pocket from occuring again, and also those half inch vents are far too small. It takes forever to vent the main tanks. Thats one for a winter modification.</div>
<div> </div>
<div>I think that was it.</div>
<div>Regards</div>
<div>James</div>
<div> </div>
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