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Re: [PSUBS-MAILIST] OSS viewports
Those types of viewports aren't a strong in the long
run as solid ones that use a retainer. Acrylic will
stress as it ages, and the more edges and reliefs
there
are in the viewport...The more dangerous it will be as
it ages. I don't know how big a deal this really is
for most subs, but that is why the retainer style is
more popular.
Warren.
--- Thijs Struijs <thijs-struijs@planet.nl> wrote:
>
> When you look at Bill's viewports
>
(http://www.giffordmarineinc.com/sub/sub_5_16_03/Sub_5_16_03.html)
> you can see that he uses an acrylic disc bolted to a
> flange. The Nekton subs use a similar method. The
> Delta is probably the most sucsesfull small sub ever
> built. Yet i cannot find anything on them in the
> ABS or Lloyds rules or in Stachiw's book.
>
> It is a simple and cheap way to make the viewports.
> Flanges can be bought of the shelf. No need for a
> big lathe and no retainer-rings to make. Can anyone
> explane me why it is that these viewports aren't
> more popular.
>
> Thijs Struijs
>
> The Netherlands
>
>
>
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