Re: PVC

[shawl@torchlake.com (Jonathan Shawl)]

Hi Pvc-Subbers
Sounds like another rerun is about to start.
And here I thought the "rubber sub" idea was dead along with the horsie.
Maybe not. PVC? Sure it might work, but for what depth and at what cost? How
much does PVC cost compared to steel when comparing it strength to strength.
Sure plastic can be less expensive than steel but what if you need 15 times as
much of it to do the same job?  And since no one has ever made an entire sub
from PVC what about all the costly testing? We covered all this before with
other materials like concrete (it sank), fiberglass, rubber, Plywood (popsicle
sticks), milk tanks.
Why not go over it again with PVC ?
Jonathan Shawl

F Phillips wrote:

> 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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