Re: [PSUBS-MAILIST] Re: Viewport Toughness

[Herman Cini <hermancini@yahoo.co.uk>]

I have been following the discussion regarding the construction of submersibles and recently this thread on visors.

 

I have been looking at using a 60cm diamter, 30cm high cylinder of polycarbonate/acrylic instead of a dome. Can anyone give me suppliers for this ?

 

Thanks

Herman Cini

Warren Greenway <opensourcesub@yahoo.com> wrote:

I'm afraid that safety glass isn't really suitable for
high-pressure applications. It is only design to
control the shattering process. As soon as it starts
to break under pressure, it will also immediately
finish. The only thing I could see using safety glass
for is a a "visor" to protect your actuall viewport.

Warren.

--- Bob Duncan wrote:
> Car windshields have 2 layers so that when the glass
> is broken it doesn't shatter. Safety glass that is,
> as required on automobiles in the U.S.
>
> pierre&marie
> wrote:Maybe one correction:
>
> The method I saw was to put a thin layer of hard
> material on an existing
> window. The goal of that is to keep all the parts of
> that window together.
> Just like a windshield from a car. That could
> prevent water from entering
> the hull. I don't think it could make the viewport
> more strong... just more
> air-tight. And, the way the viewport is made should
> also be different
> because, if the viewport is broken, the middle is
> gonna pull the edge inside
> the sub...
>
> Pierre
>
>
>
> ----- Original Message -----
> From: "Coalbunny"
> To:
>
> Sent: Monday, October 06, 2003 9:47 PM
> Subject: Re: [PSUBS-MAILIST] Re: Viewport Toughness
>
>
> > And unlike in the movies, whent hat baby starts
> crakin', it ain't gonna
> > be in the middle. It's gonna be where the pressure
> has found a weak
> > spot, and odds are you won't know even then,
> because it won't just
> > crack, it's just gonna go, period. And if that
> happens while you're
> > hanging out at 1,200 feet checking the seafood
> selection, you'll be part
> > of the menu.
> > Carl
> >
> >
> > Ron wrote:
> > >
> > > As Ray said, bullet proof glass is made of
> polycarbonate, not acrylic.
> > >
> > > In a sub you are resisting against pressure
> first, over the entire
> > > surface area, and also the sum of that pressure
> on your
> > > sealing/attachment method. Impact resistance is
> secondary.
> > >
> > > -----Original Message-----
> > > From: owner-personal_submersibles@psubs.org
> > > [mailto:owner-personal_submersibles@psubs.org]
> On Behalf Of Ray Keefer
> > > Sent: Monday, October 06, 2003 5:10 PM
> > > To: personal_submersibles@psubs.org
> > > Subject: Re: [PSUBS-MAILIST] Re: Viewport
> Toughness
> > >
> > > Hi,
> > >
> > > No such thing as "bullet proof". I have seen
> banks with "bullet proof"
> > > glass (probably polycarbinate) windows an inch
> thick (1 inch = 2.54
> > > centimeters). Seems they have to be thick to
> absorb the energy of most
> > > common projectiles.
> > >
> > > "bullet proof" glass may be tough but how tough?
> How tough is enough?
> > > The only real extensive viewport research was
> done by Stachiw on
> > > acrylic. Anyone deviating from acrylic needs to
> take samples of their
> > > target material and test it. You must see for
> yourself if the target
> > > material is as tough as you want.
> > >
> > > Regards,
> > > Ray
> > >
> > > Pierre Poulin wrote:
> > > > Could it have been prevented with
> > > > the "bullet proof" windows? I don't know...
> Just a tough.
> > > >
> > > > Thanks for the comments!
> > > >
> > > > Pierre Poulin
> > > >
> > >
> > > ---
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> >
> > --
> > "Without deviation from the norm, progress is not
> possible" - F. Zappa
>
>
>
> Two guiding principles govern Israel Naval Commando
> doctrine:
>
> 1.Every defense system is vulnerable.
>
> 2.The enemy can deal with weapons and operational
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