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Carl said:
>
> Scott,
> 
> >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?
> 
> It's a kLOT easier to make a couple of say, 8" diameter or so plates
> VERY thick to withstand the structural forces than it is to make a
> flat rectangular plate which, as someone pointed out, will have uneven
> forces at it's center.  With the two flat ends, if you employ a sort
> of "floating" O ring approach then there won't be much force
> transmitted to the cylinder either.  Even without this floating
> approach, you're still taking about a much better design than the
> neutraleak approach.  [...]

Would capping the ends of the cylinder with a hollow hemispherical 
shape improve the strength compared to a plate of the same material
and thickness?  If so, is it just not worth doing because of additional 
manufacturing complexity?

- Todd

p.s. This thread reminds me of one of the sessions at tek95,
     where Phil Nuytten talked about the challenges in designing
     the shape of his 1ata suits, where it's important to find a
     design sufficiently strong for a given weight that won't 
     have the segments "running into eachother" as the diver 
     rotates the joints.  Very interesting.  I didn't notice
     anything rectangular or flat on the NewtSuit...

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