[PSUBS-MAILIST] K-250 side viewport and dome hatch.

[James Frankland via Personal_Submersibles]

Thanks Jon.  Interesting, if a bit risky.

On Tue, 29 Sep 2020 at 12:47, Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Exactly how he did it James.  Had a diver outside just hold a metal cover
> over the outside flange, then unbolted the view port from the inside.
> Water pressure retained the cover on the outside once the view port was
> released.  It was not a waterproof solution, there was plenty of leakage,
> however it also was not a flood.  It did require fast reflexes and a quick
> replacement.  Had a bolt rolled away or some other little distraction
> occurred it would have been a much different story.  I looked for the video
> again and couldn't find.  It is a video associated with one of the "meets"
> he had with the submarine community over there.
>
> I was wrong about Madsen drilling his view ports.  He used an internal
> retaining ring surrounded by attachment bolts with no circumferential
> support.  See attached photo.
>
> Jon
>
>
> On Tuesday, September 29, 2020, 06:10:09 AM EDT, James Frankland via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Swapping out a viewport underwater?  Does anyone have a link to that?  I
> am assuming he covered the port on the outside as I believe on that boat,
> the ports came off from inside?
>
> Would like to see the video if anyone has it?
>
> On Mon, 28 Sep 2020 at 17:27, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Attachment holes through viewports are not currently accepted as safe
> practice even though there are some early model submarines that did utilize
> that configuration.  Sean could likely give a better description but in
> laymen terms those holes introduce stress and fatigue that could lead to
> development of cracks within the acrylic material and seriously weaken it.
> I think the Nekton series used such a configuration but those submarines
> were certified and therefore went through intense engineering study and
> testing.  Any comment Vance?
>
> Peter Madsen drilled holes in his view ports to attach them to his
> submarine UC3, but Peter was also a risk-taker generally and I don't
> believe he ever dove UC3 to any serious depth.  There's a video somewhere
> of him swapping out a view port underwater.
>
>
>
>
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