[PSUBS-MAILIST] Mo buoyancy

[Ian Juby via Personal_Submersibles]

Thanks Brian - I was really unclear as to what I was asking, but that
actually helped because you explained some things I wasn't expecting. So
what I thought were fiberglass pressure tanks are foam filled? I assumed
they were ballast tanks and you filled them water to control buoyancy,
hence the reason I assumed they were pressure tanks and hence the reason I
was asking if you made them or not.  :D
But what I was trying to ask was how deep is your sub rated to dive to?
This has been interesting and a lot of fun - thanks for taking the time out
to explain what you're doing.
Ian


On Tue, Apr 14, 2020 at 7:11 PM Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Ian,          That foam is rated to 580psi, but it needs to be sealed or
> it will absorb water .  Yes I made those foam pieces, the tube was easy
> because I just used 12" pvc pipe and then I had to make end pieces for
> them.  The odd shaped piece I ended up making a mold using thin luan
> plywood and one bys,  and then I put packing tape all over the inside of
> the mold so the foam would not stick, and put a thin coat of Vaseline over
> the packing tape.  I had to do some additional shaping to avoid protrusions
> and so I could slide it in there.
>
> It's a two part foam, you have 60 seconds to pour it after you mix it
> thoroughly until it starts foaming.
>
> Brian
>
>
>
> --- personal_submersibles at psubs.org wrote:
>
> From: Ian Juby via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Mo buoyancy
> Date: Tue, 14 Apr 2020 18:56:35 -0400
>
> NOICE. I love this stuff guys, getting to sea your projects. (Sea what I
> did there?) Brian - how deep is that one rated to go? And did you make
> those fiberglass tanks yourself?
> Ian
>
>
> On Tue, Apr 14, 2020 at 6:48 PM Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi All,
>                    I've added more buoyancy to my nose area, equivalent of
> about 400lbs positive buoyancy.   I have a big block of high density foam
> that I custom made to fit in this odd space and another 12" dia x 5'
> pontoon shaped float as well. Everything is wrapped with fiberglass and
> epoxy resin and painted with epoxy primer and epoxy paint, with a lot of
> attention paid to sealing everything completely .
>
> Should be able to get out in the water pretty soon.
>
> Brian
>
>
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