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Greetings Alan,
You might want to check the link to the pictures once
more. Since I sent the post, before I realized I have a number of other pictures
that didn't relate to the CT. No the SS bars don't hold any thing up. Rods
like that are meant for retention loads, not compression. They would just
bend if they were. As the hydrostatic pressure increases, the rods just slide
freely through both attachment holes. They are to keep the seating rings
for the acrylic cylinder tight against the acrylic seating surfaces, when at or
near the surface. As well as deal with some hydrodynamic forces near the
surface, and help in a collision.
That acrylic can easily handle the weight of that
steel CT top section and the hydrostatic load at 100 meters down. It's a thick
window.
You speak of the 2Dive sub. It has a crash cage over
head, basically as I will have. I'm hoping to be able to go without out
the prison bars that the S101 has. My main issues are dealing with internal
pressures over ambient and collision. I think I've figured out both to my
satisfaction. Now I'm just dealing with a design for a double
overlapping V clamp that will make it so I'm not just one bolt away from
braking, and ruining my dive day. The 2Dive sub is using bolts that go thru
holes drilled in the acrylic bonded on flanges. I don't wish attach mine in that
fashion.
I was joking with my sister in Iowa today, that I
thought I was currently working in the New Zealand time zone. This proves it.
;}
Regards,
Brent
From: Alan James
Sent: Thursday, September 03, 2009 1:32 AM
Subject: Re: [PSUBS-MAILIST] S101 Acrylic CT Specs from
Owner Very good Brent, great photos.
You said the cylinder has to deal with the
weight of the weldment above it. I thought the
supporting rods would be doing that. I know there
was a sub with a similar cylindrical acrylic conning tower
that you posted recently with no supporting
rods.
It must be difficult to set it up so that the
acrylic seals top & bottom but doesn't bear too much weight.
Alan
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