[PSUBS-MAILIST] Prestressed hull constructed of coiled tubing

[Marc de Piolenc via Personal_Submersibles]

While looking for something else (roof shell information for my future 
house) I blundered into a 1975 thesis by Gerald Webb about the strength 
of prestressed cylinders made of coiled tubing.

This set off a bright light in my skull, because I had actually seen the 
diagram of a pressure hull of a naval minisub with this kind of 
structure, but at the time had no idea of what it meant.

It makes a helluva lot of sense - building a tubing coil is almost 
certainly cheaper than building an accurate metal plate cylinder roller.

No information yet on what is done with the ends - haven't gotten that 
far. The document itself is on Scholar's Archive at OSU.

Marc
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