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As is the way in other engendering, you
drill 1 hole pore in the red lead etc. roll the drum (in this case the hull,
and seal the hole with a bolt. This would not reduce the strength by much id
the bolt is only 10mm. Rgds AndyH From:
ShellyDalg@aol.com [mailto:ShellyDalg@aol.com] Hello. I saw a psub that was 1/2 inch
thick hardened boiler plate and was good to 1000 ft. The builder used rolled " channel
iron " at 3 inch by 1-1/2 inch. The result was nice. The rings were
rolled with the 3 inch flat to the inside, and it was very strong while not
consuming much interior space. Once welded in place, the orientation made a
" boxed " stiffener and you could crawl over them without any
discomfort. Here's a little sketch.
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CHANNEL 3 X 1-1/2 My only problem would be that you can't
reach the inside to paint it or monitor corrosion. Frank Dalgleish. |