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Re: [PSUBS-MAILIST] elliptical heads/ Git Kraken



In a message dated 11/2/2009 6:55:19 A.M. Pacific Standard Time, jonw@psubs.org writes:
Assuming the 12 and 20 inch descriptions provided by Frank are OD, then
the Stachiw specs are:
20 inch diameter = 16 inch viewable diameter from inside the sub x 2.4
inch thickness
12 inch diameter = 9.75 inch viewable diameter from inside the sub x
1.46 inch thickness
Hi Jon/all.
Sorry for the late reply but I was out of town for a while.
On my windows.......
The main window is 24 inch ID with a 2 inch wide X 1 inch thick base, welded inside a 6 inch long sleeve of 3/8 inch steel and set so the 3 inch plexi disk is flush with the outside of the sleeve.
The two smaller windows are 16 inch ID with the same base ring ( 2" X 1 " ) set to accept 2 inch thick disks.
This gives inside viewable diameters of 20 and 12 inches.
    I've been talking to Hugh in New Zealand and I may have to cut out the window sleeves and replace them with much thicker sleeves. This of course will mean new base rings and a smaller window as I can't change the ballast tanks and FRP fairings so the OD of the sleeve will need to stay the same.
Still thinking on what the best solution is, but I will probably continue with what's there for now and expect a much reduced dive depth. The window assemblies can be removed next winter so I can still make the convention with a working sub, although with a shallower depth rating.
Hugh mentioned a sleeve thickness of 1.25 inches for the large window and .75 inches for the smaller windows. This will require some redesign of weight balance as well, and who knows what else it changes.
It seems like the most straight forward fix at this point. Thanks for all your input and I'll keep working on the front and rear bolt-on sections for now as I study different solutions.
Frank D.