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<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: #e4e4e4; font-color: black"><B>From:</B>
<A title=personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org">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">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></DIV><FONT id=role_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
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>
writes:</DIV>
<BLOCKQUOTE
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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>
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