| Another one that I didn't originally think of / hear anyway but have seen it happen in practise is the little fact of actually being able to hear if you have air pissing out of your first stages / valves.
Those who've tried simulating with an air gun valve failures with the tanks upright will no doubt testify that it's pretty damn obvious when air is rushing around your ears. No doubt those who've suffered it for real would attest to the same thing.
However, I've seen a good few people now, diving inverts, who in the same simulation simply can't hear the air pissing out, as it's right down at the bottom of their back - a long way from their ears!
It may well be different in a 'real' situation, but after seeing this a few times it also seems to make a pretty solid argument!
As others have said though, to me, the biggest factor is the long hose. Just as Iain pointed out - to be most effective, the donatable hose needs to be about 7' long. Sticking these on inverts (without bungee.. ;-) ) gives you a good couple of foot-worth of hose flapping about with nowhere to go (presuming you were trying to hog loop it).
Besides that... it just doesn't look right... :-D
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Dave Smith |