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>In my limited experience, lift bags tend to take off slowly and in a short distance >accelerate quite a bit. Usually too much to control after about 5 feel (granted >this is from only about 40 feet to start). Deeper would, of course, be slower to >expand, but nevertheless it will become very positive if it has to lift any >significant weight and it isn't full of air to start with. You think that's something? Ever seen a 50 gallon oil drum get away? My advanced class was using two of them to lift this murderously-heavy concrete block, for our light salvage practice. We were in about 60 ffw or so at the time. Somehow, we managed to forget to attach the drum to the block, so when we started shooting air into the drum, it took off like the proverbial bat out of h*ll with its tail on fire. Our surface crew tells us it threw itself COMPLETELY out of the water. AND THE BEST PART: It jumped out of the water just a short distance away from our dive flag float. The Sheriff's boat was in the immediate vicinity at the time, WELL inside the 100' radius, and our surface crew was yelling at them to get the H*LL clear of the diver's flag, just when the drum came up. The klutz who was driving the boat suddenly figured out he was in a bad place, and no one would have ANY sympathy for him, or his boat, or his excuses, if the next drum came up through his keel. We couldn't have done it better if we had planned it that way.
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