[PSUBS-MAILIST] Medium-Sized Submarine Hull Geometry

[Charles Perkins <chuck@memetech.com>]

Hello all,

My dream submarine would be a larger one (since I'm dreaming it can  
be as large as I want, right?) so I have been sketching submarines  
between 40 and 65 feet long. I would like this submarine to be able  
to dive to greater depths, and to that end I pose to you folks the  
following question--

For a submarine with a designed working depth of 1 kilometer  and a  
33% safety factor (designed crush depth of 1.5 km) and three hull  
section diameters (8 feet, 10 feet, and 14 feet) and a length between  
reinforced frames or bulkheads of 11 feet, is there a better way to  
build the hull than the following:

 Frames one foot apart on center
three inch wide flanges capping each frame
.5 inch thick steel frames 12 inches deep with a .5 inch thick flange  
for 8' and 10' diameter sections
.75 inch thick steel frames 18 inches deep with a .75 inch thick  
flange for a 14' diameter section
1.25 inch thick shell on 8' section
1.5 inch thick shell on 10' section
1.75 inch thick shell on 14' section

using A517 gr 70 steel (young's modulus 28446000, Poisson's ratio .3,  
yield stress 70000)

As you might guess, I have been playing around with spreadsheets in  
order to make the details of my drawings more realistic. The above is  
what I have come up with so far. I would be interested to know if the  
above solution for a deep diving medium-sized submarine bears any  
relation to reality...

Or you can just be cheerfully amused at my naiveté. I don't mind.

Thanks,

Chuck






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