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

["Jim Kocourek" <kocpnt@tds.net>]

Hi Dariusz,

I'm not an expert on the subject but am somewhat in the know because of my 
desire to have a large window in a price range that I can afford and still 
be able to get 1000 foot depth.

Sheet acrylic as far as I know is not available in widths of greater than 48 
inches. In a dome shape this limits you to about 39 inch diameter.

I had Greg make up a dome 39 inches diameter and 2.5 inches thick. I then 
had two rings formed to make the seat area and have welded them together. 
This seat has now been tacked to the transition cone which is 11 inches tall 
and transitions from the sub 48 inch OD to the 42 inch OD of the window 
seat.

When this is finish welded I will take the assembly to a machine shop that 
is capable of handling this piece and machine the seat area. In my case the 
cone is 3/4 inches thick and the rings of the seat are 1.5 inches thick the 
forming was quite expensive.

The steel work to accomodate the window is more expensive than the window 
itself. I will have a very nice window when complete, but the entire window 
and seat/cone will be close to $9,500.00.

While this is a lot of money, it gives me most of what I want. I originally 
wanted a 48 inch dome, but the cost would have put a stop to my project.

If I am correct in saying 48 inch diameter sheet is the maximum you do not 
the option of making a 59 inch diameter flat window, as I would never do 
this by overlaping and bonding sheets.

I no this is not what you want to hear, but I think my experience is 
accurate.

Best Regards,

Jim K
----- Original Message ----- 
From: "Dariusz Hoffmann" <darekhoffmann@gmail.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, September 09, 2008 6:04 AM
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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