<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><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><div><br></div><div><br></div><div><br></div><div><br></div><div><div style="font-size:75%;color:#575757">Sent from my U.S. Cellular© Smartphone</div></div> <br>Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt"><div><span>Dan / Scott,</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>I'm a bit puzzled by this.</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>There wouldn't be water in the line initially unless the valve exit was facing upward & rain </span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal;
background-color: transparent;"><span>or wave splash entered it. Does water enter in as the sub bobbles about & the ballast</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>air exit dips below the water? I guess then the water in the line would be held in place</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><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="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue',
Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span style="background-color: transparent;">but is enough to hold it in position.</span></div><div style="color: rgb(0, 0, 0); font-size: 13.333333969116211px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span style="background-color: transparent;">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> Dan H. 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> Friday, June 13, 2014 3:03 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Bouyancy<br> </font> </div> <div class="y_msg_container"><br><div id="yiv7288344477">
<style></style>
<div>
<div><font size="2" face="Arial">Scott, </font></div>
<div><font size="2" 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 size="2" face="Arial"></font> </div>
<div><font size="2" 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 size="2" 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-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;">----- Original Message ----- </div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; background: rgb(228, 228, 228);"><b>From:</b>
<a rel="nofollow" title="personal_submersibles@psubs.org" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">swaters via
Personal_Submersibles</a> </div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;"><b>To:</b> <a rel="nofollow" title="personal_submersibles@psubs.org" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">Personal Submersibles General
Discussion</a> </div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;"><b>Sent:</b> Wednesday, June 11, 2014 10:37
PM</div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;"><b>Subject:</b> Re: [PSUBS-MAILIST]
Bouyancy</div>
<div><br></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>
<div><br></div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>
<div style="COLOR:#575757;FONT-SIZE:75%;">Sent from my U.S. Cellular©
Smartphone</div></div><br>"Dan H. via Personal_Submersibles" <<a rel="nofollow" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:<br>
<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-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;">----- Original Message ----- </div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial; background: rgb(228, 228, 228);"><b>From:</b>
<a rel="nofollow" title="personal_submersibles@psubs.org" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">via Personal_Submersibles</a>
</div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;"><b>To:</b> <a rel="nofollow" title="personal_submersibles@psubs.org" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>
</div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;"><b>Sent:</b> Wednesday, June 11, 2014 9:53
PM</div>
<div style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-family: arial;"><b>Subject:</b> Re: [PSUBS-MAILIST]
Bouyancy</div>
<div><br></div><font id="yiv7288344477role_document" color="#000000" size="2" face="Arial">
<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 rel="nofollow" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">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" size="2" face="Arial">
<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>
<div><br></div>
<div><br></div>
<div><br></div>
<div><br></div>
<div>
<div style="COLOR:#575757;FONT-SIZE:75%;">Sent from my U.S. Cellular©
Smartphone</div></div><br>James Frankland via Personal_Submersibles
<personal_submersibles@psubs.org> wrote:<br>
<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>
<div> </div><br><br>_______________________________________________<br>Personal_Submersibles
mailing
list<br>Personal_Submersibles@psubs.org<br>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<br></font></blockquote></div></font>
<hr>
_______________________________________________<br>Personal_Submersibles
mailing
list<br>Personal_Submersibles@psubs.org<br>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<br></blockquote>
<div>
</div><hr>
_______________________________________________<br>Personal_Submersibles
mailing
list<br>Personal_Submersibles@psubs.org<br>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<br></blockquote></div></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></body>