[PSUBS-MAILIST] Sand Blasting

Thu Aug 16 18:42:45 EDT 2018

Hi Brian
36"od, A516gr70, 3/8" wall. Sail 32"od, A516gr70, 3/4" wall. External
t-rings, 2x2x.25 @ 12" o.c.
David

On Thu, Aug 16, 2018, 12:31 PM Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> That's interesting !   What is the diameter of the main body of your sub?
>  And what is the thickness of the hull material?
>
> 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: Thu, 16 Aug 2018 09:38:13 -0700
>
> 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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