[PSUBS-MAILIST] GRP hatch

[Alec Smyth via Personal_Submersibles]

Hi Hank,

Personally I'd have to research stress calculations in GRP before going
that route. But even once that were figured out, the build variations in
hand-laid GRP would make me sceptical of my own calculations. I suppose the
alternative would be to make a number of them and test to destruction. It
would have to be a number of them, not just a single sample, because
evaluating standard deviation would be just as important as confirming the
depth rating. That's rather painful, so for my part I'd look at
other solutions.

Thanks,
Alec

On Tue, Apr 28, 2020 at 9:50 AM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec, I think Mike has a submarine parts warehouse lol.  I would like to
> use what I have, just so I don't have to make too many major
> modifications.  Have you ever heard od a GRP hatch?
> Hank
>
> On Tuesday, April 28, 2020, 7:44:51 AM MDT, Alec Smyth via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hi Hank,
>
> May I suggest speaking to Mike Caudle? He has two acrylic cylinder CTs,
> complete with hatches and all, that are beauties but I believe much lower
> displacement than the one on your project sub, and very lightweight because
> they are aluminum. If you can arrange a swap or something, one of those
> might be just what you need.
>
> Best,
> Alec
>
> On Tue, Apr 28, 2020 at 9:17 AM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi All, I am have some real trouble with my DW style sub mods. If you
> recall it has an acrylic cylinder CT and a K350 hatch.  My problem is, the
> sub lacks volume to support the heavy hatch\land assembly.  I do plan to
> increase the volume by installing a larger diameter leg tube.  This volume
> increase is still not enough to give me enough buoyancy for stability
> during transition from surface to being submerged.  Options are to loose
> the cylinder and go with dome.   Make a lightweight hatch with GRP, or come
> up with a creative MBT that maintains buoyancy longer during submerging.
> Hank
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