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At 01:33 PM 6/3/2001 -0400, ASC wrote:

>If one takes a GUE course, he or she would know that GUE advocates deploying
>the lift bag once you arrive at 70', not at 275'.

While it may not be good practice to shoot a bag from deep water,
the dump valve should nevertheless prevent the bag from rupturing
a seam.

>I'm unaware of problems
>when one deploys the bag properly.

I'll make you aware of a problem now:

I've had two of these bags blow the upper seam while lifting a static
load off the bottom in shallow water (less than 50 feet); they were
not shot from deep water.  The load they were lifting was only about
a third of the rated lift capacity of the bag, yet the upper seam did
not hold.  This has also happened to other divers with bags
manufactured at widely varying dates so it was not a bad batch.

There is a fundamental design problem with the Halcyon liftbags in that
the upper seam, the one that sees the highest splitting forces, is
RF-welded instead of folded, continuous material like Carter, Dive-Rite,
and other more robust liftbags.

-Mike Rodriguez
<mikey@mi*.ne*>
http://www.mikey.net/scuba
Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n

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