<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=UTF-8" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 11.00.9600.17344"></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000"
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV>Hi Alec,</DIV>
<DIV> </DIV>
<DIV>I had forgotten about using dish detergent. If
I recall correctly it was used on the inside of the dome for anti-fog
also. Have to put that on my checklist before I forget it again. And
it will make the sub smell "lemony fresh." Looking forward to
seeing your pics.</DIV>
<DIV> </DIV>
<DIV>Thanks much,</DIV>
<DIV>Jim T.</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 10/28/2014 9:09:53 P.M. Central Daylight Time,
personal_submersibles@psubs.org 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>
<DIV dir=ltr>Hi Jim,
<DIV><BR></DIV>
<DIV>No mesh and no flushing system, it just takes about two minutes to remove
the outer dome as its a few screws. This BTW has never been in the water, so
we'll see and learn when it does. Just off the top of my head, it's probably
about 8 inches of separation at the apex and tapers to an inch and a half at
the base.</DIV>
<DIV><BR></DIV>
<DIV>I don't use Rain-X on the viewports, I use Joy detergent, which is a Dr.
Phil recommendation that does wonders. </DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>Best,</DIV>
<DIV><BR>Alec</DIV></DIV>
<DIV class=gmail_extra><BR>
<DIV class=gmail_quote>On Tue, Oct 28, 2014 at 6:00 PM, via
Personal_Submersibles <SPAN dir=ltr><<A
title=mailto:personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org"
target=_blank>personal_submersibles@psubs.org</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><U></U>
<DIV style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000"><FONT
color=#000000 face=Arial>
<DIV>Hi Alec,</DIV>
<DIV> </DIV>
<DIV>What is the average distance between the two domes? Do you have
any type of mesh etc. over the 1/4" holes to keep debris out? Do
you have some type of flushing system for cleaning the surfaces between
the two? Since that's an ambient space I'm guessing it wouldn't take
too long to remove the outer dome when you want to do a thorough
cleaning.</DIV>
<DIV> </DIV>
<DIV>All: Have you been using Rain-X on your view ports and
domes? A while back I saw some ads for another
hydrophobic product that claims to be superior to Rain-X, but I don't
recall the brand.</DIV>
<DIV> </DIV>
<DIV>Best regards,</DIV>
<DIV>Jim T.</DIV>
<DIV>
<DIV class=h5>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 10/28/2014 4:30:30 P.M. Central Daylight Time, <A
title=mailto:personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org"
target=_blank>personal_submersibles@psubs.org</A> writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 face=Arial>
<DIV dir=ltr>Hi Vance,
<DIV><BR></DIV>
<DIV>Actually it starts at 2" thickness, and at the time was the thickest
dome Greg had made. It was an iffy proposition, meaning he didn't know if
it would turn into sub jewelry or just a deformed glob of expensive
material. Luckily it came out virtually perfect. </DIV>
<DIV><BR></DIV>
<DIV>My hull is 31" OD, a little smaller than yours. The window is a 120
degree segment, just under 27" OD. So the trick is how to span the gap
between the 27 inches and the 31 inches. In the original design, this bow
window also acted as a hatch, a la Deep Flight. I made a massive Al ring
31" OD, which telescoped on linear bearings and four 1.25" bars, driven by
rams. With ensuing redesign, the need for all that disappeared because I
now have a coning tower, so I've dropped the bars and rams, and the seat
is now mounted to the hull very simply with four big bolts. It will make a
very handy big door into the sub for maintenance purposes, but is overkill
and the window could be mounted by using part of your existing endcap and
a permanently welded conventional seat. </DIV>
<DIV><BR></DIV>
<DIV>One big decision is the window seat geometry. I like conical because
PVHO rates it for twice the life of square edge, but it requires
fabrication capabilities that Greg didn't have for the window and I didn't
have for the seat. So its a square edge for the simple reason that we
could make it that way. </DIV>
<DIV><BR></DIV>
<DIV>I should mention the Al ring actually has two domes on it, one inside
the other. The 27" dome is structural, and the outside dome is 31" and
only half an inch thick. The outside one is just for fairing, to protect
the structural dome from abrasion, and to mitigate collision damage. The
space between the two domes is free flooding, and there are 1/4" holes
around the edge of the outer dome to facilitate that. In a collision, the
water would squish out through the little holes, so the thing is basically
a shock absorber.</DIV>
<DIV><BR></DIV>
<DIV>As for calculations, I will paste the window calcs below. It is
really just table lookups from PVHO tables, a simple cook book. The seat
would have to be calculated with FEA. I didn't have FEA, so I did like the
Greeks and Romans. You know why the Partenon is still standing? Try to do
engineering calculations using Roman numbers! It was too complex, so they
simply made everything massive. The seat is one integral piece of aluminum
of ridiculous proportions, and it backs into a 516 gr 70 ring on the end
of the hull that is an inch thick and two inches deep. I'm pretty
confident that ring isn't going wobbly before something else
does. </DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>Best,</DIV>
<DIV><BR>Alec</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>----------------- pasted ------------------</DIV>
<DIV>
<H1><SPAN style="FONT-SIZE: 14pt">Viewport Depth Rating per
PVHO-1a-1997</SPAN></H1>
<P class=MsoNormal> </P>
<P>The following calculations and specifications are for a sperical sector
window with square edge, to include an optional O-ring seal.</P>
<P class=MsoNormal> </P>
<P class=MsoNormal> </P>
<P class=MsoNormal> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">1) Determine Conversion
Factor (CF) </SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Water temperature =
75 </SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol">°</SPAN><SPAN
style="FONT-SIZE: 10pt">F (tropical conditions)</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">From Table 2-2.4, CF = 7
</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">2) Given actual
fabricated dimensions</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">t</SPAN><SUB><SPAN
style="FONT-SIZE: 10pt">min</SPAN></SUB><SPAN style="FONT-SIZE: 10pt"> =
1.73”</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">D</SPAN><SUB><SPAN
style="FONT-SIZE: 10pt">i</SPAN></SUB><SPAN style="FONT-SIZE: 10pt"> =
26.847”</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol">\</SPAN><SPAN
style="FONT-SIZE: 10pt">t/D</SPAN><SUB><SPAN
style="FONT-SIZE: 10pt">i</SPAN></SUB><SPAN style="FONT-SIZE: 10pt"> =
0.064</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Entering table 2-2.10
with STCP, t/Di = 0.064</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Solving for Critical
Pressure = 3,460 psi</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Since Short Term Critical
Pressure (STCP) = CF x P = 3,460 psi</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt">Solving for P,
P = 3,460 / 7 = 494 psi</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt"></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol">\</SPAN><SPAN
style="FONT-SIZE: 10pt"> Safe operating depth for window = 1,139
fsw</SPAN></P></DIV>
<DIV><BR></DIV>
<DIV> </DIV></DIV>
<DIV class=gmail_extra><BR>
<DIV class=gmail_quote>On Tue, Oct 28, 2014 at 3:48 PM, via
Personal_Submersibles <SPAN dir=ltr><<A
title=mailto:personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org"
target=_blank>personal_submersibles@psubs.org</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><FONT
color=black size=3 face="Arial, Helvetica, sans-serif"><FONT
size=3>Alec,</FONT>
<DIV><FONT size=3><BR></FONT></DIV>
<DIV><FONT size=3>I hope this is still you.</FONT></DIV>
<DIV><FONT size=3><BR></FONT></DIV>
<DIV><FONT size=3>I've been talking to Greg about a major retro-fit on
my K-350--a full hull-diameter dome segment viewport in place of the
forward elliptical head. He mentioned having built yours (the 1000'
version) while we were talking about thickness and whether to try and
use something out of Pete's junk pile.</FONT></DIV>
<DIV><FONT size=3><BR></FONT></DIV>
<DIV><FONT size=3>While we were chewing the fat about this, he said that
to the best of his recollection, yours started at 1.5" thickness, and
that he could build it for me (maybe a 150 degree arc segment) for what
I thought was a very reasonable amount.</FONT></DIV>
<DIV><FONT size=3><BR></FONT></DIV>
<DIV><FONT size=3>My problem (okay, one of my problems) is that I don't
really know how to do the calculations for these things. That said, I'm
wondering if a partial copy of yours might not do the trick for my
application (it would be tested much shallower, 500 feet or
thereabouts).</FONT></DIV>
<DIV><FONT size=3><BR></FONT></DIV>
<DIV><FONT size=3>I don't know how you feel about sharing that kind of
thing, but I have a picture in my head of an acrylic bow K-350 with some
fairings and a Minn-Kota driven Deepworker style propulsion system. I
think it would make a great little boat, and so if I can get the
viewport and frame designed, then it's going to be built.</FONT></DIV>
<DIV><FONT size=3><BR></FONT></DIV>
<DIV><FONT size=3>It's time to play if I'm going to. So, what do you
think?</FONT></DIV>
<DIV><FONT size=3><BR></FONT></DIV>
<DIV><FONT size=3>Best Regards,</FONT></DIV>
<DIV><FONT size=3>Vance
Bradley</FONT></DIV></FONT><BR>_______________________________________________<BR>Personal_Submersibles
mailing list<BR><A title=mailto:Personal_Submersibles@psubs.org
href="mailto:Personal_Submersibles@psubs.org"
target=_blank>Personal_Submersibles@psubs.org</A><BR><A
title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles"
target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR><BR></BLOCKQUOTE></DIV><BR></DIV><BR><BR>_______________________________________________<BR>Personal_Submersibles
mailing list<BR><A title=mailto:Personal_Submersibles@psubs.org
href="mailto:Personal_Submersibles@psubs.org"
target=_blank>Personal_Submersibles@psubs.org</A><BR><A
title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles"
target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR></FONT></BLOCKQUOTE></DIV></DIV></DIV></FONT></DIV><BR>_______________________________________________<BR>Personal_Submersibles
mailing list<BR><A title=mailto:Personal_Submersibles@psubs.org
href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A
title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles"
target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR><BR></BLOCKQUOTE></DIV><BR></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></BODY></HTML>