[PSUBS-MAILIST] Sand Blasting

Thu Aug 16 12:38:13 EDT 2018

Hi Brian,
When we were doing the Finite Element Analysis trying to achieve 1000 ft
design depth, we ran into that issue. And to honest, we chased the loads
and added additional steel and reinforcing, and then the load stress moved
somewhere else, and we would chase it again. Ultimately the initial design
parameters were exceeded in the weight of the sub, and we never could hit
the 1000ft mark. So after a conversation with Cliff, who brought me back to
my senses, I put my ego in my back pocket, and settled on the 500ft mark,
as we were able to achieve all of my initial design parameters on the first
run of the FEA.  I know that my design is not the standard k boat, but
having been in a few I found that I wanted a bigger sail diameter to
accommodate all of my instruments, and my shoulders. This decision I
believe was the main reason we could not hit the 1000ft mark. But I'm ok
with the depth. Our main pilot sail is 32"od, with a 30"od acrylic dome.
The forward sail is 27.5"od. with same dome size. Plenty of room for
looking around. I think were forming the forward sail today. So I may have
an updated photo soon.

David

On Aug 16, 2018 6:27 AM, "Brian Cox via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

David,    I've been looking at your sub configuration and I'm curious about
the intersection  of the conning tower and the main body of the sub.  My
original design was a 24" conning tower intersecting a 32" main body.  That
design was deemed problematic by a consensus of a number of fellow
psubbers.  The issue was a weak area at the side area where the
intersection occurs .  Are you planning any additional reinforcement in
that area ?

Brian

--- personal_submersibles at psubs.org wrote:

From: David Colombo via Personal_Submersibles <
personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <
personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Sand Blasting
Date: Tue, 14 Aug 2018 16:09:22 -0700

I was just thinking it would be bit less oily and sooty for working on if I
had it cleaned. The primer was just a thought to slow down any flash rust
while welding tabs etc.

Best Regards,
David Colombo

804 College Ave
Santa Rosa, CA. 95404
(707) 536-1424
www.SeaQuestor.com

On Tue, Aug 14, 2018 at 2:34 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

David,
Some thoughts.
I would consult your sand blaster to see if he is going to have problems
getting in to the nose cone area. And also whoever is going to paint it
to check that the intended primer doesn't have a set time by which it needs
to have the next coat applied & that it is compatible with your intended
marine
paint system. If they specialise in marine paint application they should be
able
to give you advise on when to prime.
I painted my sub with marine epoxy but had to buy specialised equipment
to apply the extra thick paint. Started to get expensive.
You may have a lot of attachment brackets you want to weld in for seats
coms, scrubber, piping etc that you position at a later stage & that might
burn your
external primer.
Another thought is that if you are getting it blasted professionally you
don't
want to do it twice. You want them to do it once just before painting &
clean
up around the welds for you.
Cheers Alan

On 15/08/2018, at 5:19 AM, David Colombo via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

Hi Guys, I have a question on sandblasting my hull parts. The initial
fabrication is almost complete and I was thinking that I might want to have
the parts sand blasted prior to welding them all together. Maybe even a
light primer seal coat to slow flash rust as it may be at the welders for a
couple of weeks. Any thoughts or advice would be appreciated. I know right
now every time I get near the parts I'm covered in black smudges.

Best Regards,
David Colombo

804 College Ave
Santa Rosa, CA. 95404
(707) 536-1424
www.SeaQuestor.com

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