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<DIV><FONT size=3>Hi Graham,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3>If I'm following you correctly, the holes you drill to let the
water out will also let water re-enter and compress the bellows as you go deeper
and the water pressure increases. That is, the bellows would still be
subject to changing volume as your depth changes. It wouldn't function as
a VBT (hard tank). However perhaps I'm not clearly understanding your
description.</FONT></DIV>
<DIV><FONT size=3></FONT> </DIV>
<DIV><FONT size=3>Best regards,</FONT></DIV>
<DIV><FONT size=3>Jim</FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 4/12/2014 12:31:41 P.M. Central Daylight Time,
whitestar456@manx.net writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>Hi
<BR><BR>Has anyone experimented with a different variable ballast tank I am
thinking<BR>of making a tube of gas pipe which is made of thick plastic inside
I plan to<BR>fit a bellows air bag, this will be blown up by the air line
which blows the<BR>water out of the steel ballast tank . One end of the tank
will be fixed so<BR>as to hold the bellows in place the other end of the tank
will be drilled<BR>with holes to allow the water to escape and the bellows to
expand. The<BR>pressure will blow the air out of the bellows when the return
vale is<BR>opened. This method also eliminates the fear of what the inside of
the steel<BR>ballast tank is doing due to sea water corrosion. Has
anyone any views as<BR>to why this method will not work.<BR><BR>The builder of
Casper 11<BR><BR>Graham Bayliss<BR><BR>-----Original Message-----<BR>From:
Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org]<BR>On
Behalf Of Jon Wallace<BR>Sent: 11 April 2014 14:49<BR>To: Personal
Submersibles General Discussion<BR>Subject: Re: [PSUBS-MAILIST] Question for
the group<BR><BR><BR>A club designed sub "OSS - Open Source Submarine" was
attempted years <BR>ago. It had a good start but stalled soon
afterward. That kind of <BR>project is difficult to complete unless
someone with a clear vision and <BR>desire to lead the effort takes charge of
it. I don't think I have it <BR>linked from the main site anymore but
the page still exists at <BR>www.psubs.org/oss if you want to look at it or
revive it.<BR><BR>Franks saucer sub was taken over by his daughter. Her
intent was to <BR>finish it and she did write into PSUBS shortly after Frank's
death <BR>notifying us of that intent, however I have never heard back from
them <BR>again and don't know what ultimately became of the
sub.<BR><BR><BR><BR>On 4/10/2014 4:18 AM, James Frankland wrote:<BR>> Hi
Scott\All<BR>> I like the idea of the "club" manipulator.<BR>><BR>> I
think there is scope for several club type projects. Just off the
<BR>> top of my head.<BR>> Club designed sub plans. Perhaps based
on the K250 or Emile's Eurosub <BR>> but kept super simple for the first
time builder.<BR>> Manipulator arm<BR>> Re-designed hatch for K
boats<BR>> Single sideband UW radio<BR>> O2 monitor<BR>> I always
thought it would be nice for someone or group to get hold of <BR>> Franks
saucer sub and get it finished. im sure he'd have liked to see <BR>>
it in the water.<BR>> Anyway, just thinking aloud,<BR>> Kind
Regards<BR>>
James<BR>><BR><BR>_______________________________________________<BR>Personal_Submersibles
mailing
list<BR>Personal_Submersibles@psubs.org<BR>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<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></BODY></HTML>