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<p>When you encounter an easy-to-cut section of concrete, do you
find a void there (air bubble) or a place where the concrete
exists, but has stratified of been allowed to dry before setting?</p>
<p>Marc de Piolenc<br>
</p>
<div class="moz-cite-prefix">On 6/26/2023 12:16 AM, hank pronk via
Personal_Submersibles wrote:<br>
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cite="mid:60A29AB2-1AF5-4BD4-B573-1DEDA8A257A6@yahoo.ca">
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Alec. The Swiss sub was concrete with a slip form method. I think
Farrow cement is troweled onto a mesh frame. I was pretty
intrigued by this also. A conversation with Sean made me change my
mind. Although concrete structures under water have a good track
record, the chance of a weak spot is too great. My business
includes concrete cutting, and often when cutting we hit spots
that cut much easier within the same pour.
<div>Hank</div>
<div><br>
<br>
<div dir="ltr">Sent from my iPhone</div>
<div dir="ltr"><br>
<blockquote type="cite">On Jun 25, 2023, at 9:08 AM, Alec
Smyth via Personal_Submersibles
<a class="moz-txt-link-rfc2396E" href="mailto:personal_submersibles@psubs.org"><personal_submersibles@psubs.org></a> wrote:<br>
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<div dir="ltr">
<div dir="ltr">There's an interesting story about cement
subs, which I will tell to the best of my recollection. In
the early years we had a PSUBS member whose name I forget,
I believe Swiss or Austrian, who had built a ferrocement
sub that he kept at a mooring in a Swiss lake. The sub was
successful, he dived it for years. But eventually he moved
to Colombia due to marriage, and scuttled the sub in the
lake, because the road he had used to take it there had
been re-routed or modified somehow, leaving him without
any way of getting it out. The sub became an attraction
for local SCUBA divers.
<div><br>
</div>
<div>The second part of the story is that another PSUBS
member, Ian Roxborough, hired the first guy to build him
a large cement sub with the intention of making it an
ocean going live-aboard. The project was done completely
on the level, with notification to authorities and in a
major port. This was no drug sub built in the jungle. It
got to the point where the hull was complete, and I
think they were about for the first launch. However,
Colombia being plagued by drug subs, the authorities
would not sign off on final paperwork or something
(can't remember the exact glitch.) Ian had sunk a ton of
funds into it, and the sub was probably perfectly good,
but approval never came. I'm not sure what happened to
the sub. But Ian is still very much active, so maybe can
tell us. I'm not sure if he's on the email list. If you
are, Ian, sorry for bringing up this rather painful
memory!</div>
<div><br>
</div>
<div>Best,</div>
<div>Alec</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Jun 25, 2023 at
8:35 AM Marc de Piolenc via Personal_Submersibles <<a
href="mailto:personal_submersibles@psubs.org"
moz-do-not-send="true" class="moz-txt-link-freetext">personal_submersibles@psubs.org</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>
<p>That's it. I lost interest when I realized he had
built a superstructure on a conventional pressure
hull.</p>
<p>Very sorry to hear about Brian Cox.</p>
<p>Marc<br>
</p>
<div>On 6/25/2023 6:11 PM, Jon Wallace via
Personal_Submersibles wrote:<br>
</div>
<blockquote type="cite">
<div style="font-family:"times new
roman","new
york",times,serif;font-size:16px">
<div dir="ltr">Marc, that was probably Brian Cox
who passed away a year or so ago. His pressure
hull was steel but he did use ferrocement for
the superstructure. <a
href="http://www.subdb.info/cgi/database/showvessel/index.cgi?ID=1272980224&VN=Esmae&VT=1"
rel="nofollow" target="_blank"
moz-do-not-send="true">http://www.subdb.info/cgi/database/showvessel/index.cgi?ID=1272980224&VN=Esmae&VT=1</a></div>
<div dir="ltr"><br>
</div>
<div dir="ltr">There are no standards for using
ferrocement as a manned submarine pressure hull
and I think anyone attempting it would find
little support for the project given the Ocean
Gate loss.</div>
<div dir="ltr"><br>
</div>
<div dir="ltr">Jon</div>
<div dir="ltr"><br>
</div>
<div><br>
</div>
</div>
<div
id="m_4380271176043459050ydpc0df22c3yahoo_quoted_7854919351">
<div style="font-family:"Helvetica
Neue",Helvetica,Arial,sans-serif;font-size:13px;color:rgb(38,40,42)">
<div> On Sunday, June 25, 2023 at 04:09:00 AM
EDT, Marc de Piolenc via Personal_Submersibles
<a
href="mailto:personal_submersibles@psubs.org"
target="_blank" moz-do-not-send="true"><personal_submersibles@psubs.org></a>
wrote: </div>
<div><br>
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<div><br>
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<div>
<div dir="ltr">I know. I fell in love with FC
for yachts, which made me wonder how <br
clear="none">
useful it would be for pressure hulls...
Turns out there is a 2010 <br clear="none">
exchange of messages in my archive with
somebody on this list who built <br
clear="none">
in FC, Brian Cox. Is he still there?<br
clear="none">
<br clear="none">
Marc<br clear="none">
<br clear="none">
On 6/24/2023 8:27 PM, Bernie Hellstrom via
Personal_Submersibles wrote:<br clear="none">
> Many boat hulls were made with FC. Even
the landing barges in the ww2 , to make
piers to in load ships!<br clear="none">
><br clear="none">
> Sent from my iPhone<br clear="none">
><br clear="none">
<div
id="m_4380271176043459050ydpc0df22c3yqtfd88497"><br
clear="none">
</div>
</div>
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<pre class="moz-signature" cols="72">--
Archivale catalog: <a class="moz-txt-link-freetext" href="http://www.archivale.com">http://www.archivale.com</a>
Mass Flow (ducted fans): <a class="moz-txt-link-freetext" href="http://massflow.archivale.com">http://massflow.archivale.com</a>
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Pinterest: <a class="moz-txt-link-freetext" href="https://www.pinterest.ph/piolenc">https://www.pinterest.ph/piolenc</a></pre>
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