RE: [PSUBS-MAILIST] Dome alternative - flat acrylic endcap

["Brian Cox" <ojaivalleybeefarm@dslextreme.com>]

Jon,
          Are you guys still offering those acrylic viewports?

Brian

-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of jonw@psubs.org
Sent: Tuesday, September 09, 2008 6:13 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Dome alternative - flat acrylic endcap



There's a diameter limit that Stachiw talks about in his book for flat disc
viewports, but I was not able to find it quickly this morning.  Perhaps Ian
or Jay could comment.  You may be close to that (if not over it) with a
59inch viewport.

Regarding disadvantages, I suspect most of them are minor with the exception
of designing the mount to attach the thin dome in front of the primary
viewport.  Some disadvantages might be:

1) small bubbles adhering to the inside of the dome
2) visual distortion from imperfections established during fabrication
3) keeping the inside face of the dome clean

Jon


-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Dariusz Hoffmann
Sent: Tuesday, September 09, 2008 7:04 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Dome alternative - flat acrylic endcap


Hello.
Apart from acrylic dome endcap I am considering an alternative - flat
acrylic endcap. This would be a flat window about 59" (150cm) in
diameter, 10" (25cm) thick. That kind of front side would be very
inefective hydrodynamically. So there should be another acrylic layer, a
thin dome with holes in it to allow flooding it while submerging. This
would increase the hydrodynamic effectivness and would also help
protecting the main window. I think this could be cheaper than
purchasing 59" od, 3" thick dome for the main window. What are
disadvantages of that solution?

Thanks
d.





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603-529-1100
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