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PVC

Hi Vance and group,  Regarding PVC crushing at 400 ft, I wonder what company
draws huge PVC pipes in an extrusion method could just set their tooling for
a 6", 9" 12" wall thickness and run a length of 20 ft or so at a 7 ft inside
diameter.  Then chem weld twin conical or hemispherical end caps at the same
12" thinkness that fit it perfect compression tongue and grove joints and
also chem welded view ports.  Seems as though the crush depth would be good,
hull never rusts, easy to drill thru hull holes with extra PVC backing at
those thru hulls.  

Then just use a very thick clear lexan viewing port(s) attached on the
outside of the PVC hull with a 2 in overlap on the outside and sealed via a
little o-ring groove and some mere location stainless small dia bolts.  The
same end cap design could be used for a short tower with huge oversized PVC
hinges and stainless locks for a nice pilot access hatch also with viewing
ports.  

Internal PVC bulkheads and stringers could also be chem welded as required
to give you a 100% margin over your reqired crush depth.  All equipment,
ballast, motors, air and communications can be in smaller twin isolated
exterior pods that have the diving planes, propellers, etc.  Does this make
any sense.  Have at me men. 
I'm not thinned skinned.  F. Phillips  




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