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On Mon, 20 Nov 1995, Scott Cherf wrote: > The competition for the 'prismatic' pressure vessel is, in this case, a > tube with two flat ends. Now, I understand the problems with flat sides > on load bearing members, can someone explain why the flat ends on a tubular > system are better than the flat sides of a Dive Rite light? > Good point, Scott. As B&B would say, they ...uh, heh, heh suck yeh, heh, heh...bad stress riser at the O-ring retainer, heh, heh.... Dennis Pierce: tell us about flat sides at 375! You can build a nice case out of schedule 40 or 80 pvc water pipe. About US$10 to hold 5 amp-hrs of lead/acid cell. Note the end caps are semispherical--not flat. You end up with a tube that hugs the backplate. All the fittings used by dive-right are available from a good hardware store like McMaster (for about $2 each). throw in the batteries, and you can meet electrical spec comparable to a mini nutra-leak (without implosion hazard) for US$50. A machine shop is nice, but you can build leak-proof containers with a hand drill, pipe tap, table saw to cut oring grooves, and an afternoon. what about those old aluminum diveright cans? with the the poisson's/modulus of metal compared to plastic, they oughta be able to go down to at least 131 ffw without bending.... good luck ;> em _____________________________________________________________.sig Eric Maiken email: eapg243@ea*.oa*.uc*.ed* Dept. of Physics o: 714 824-6621 U of California fax: 714 824 2175 Irvine, CA 92715-4575
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