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Kevin wrote: > > > > >I wonder if you have ever tried to send up a liftbag? > > > > I dont think so. When the liftbag leaves bottom and starts surfacing the > >speed will so high that the only possibility you have got, is to let go!!!!!! > > Interesting. I've never had this problem, although I've only deployed a > lift bag 10 or 15 times, many of those from 100 feet or deeper. I do a > couple of things, though... > > 1) When adding air to a lift bag, I add enough air so that it's only a > couple of pounds/kilos positive. Assuming that I send it up from, say, > 132 feet, with 1 kilo positive, it will hit the surface at 5 kilos > positive (12 pounds positive). I CAN hold position against 5 kilos > positive (although I'll be working like a banshee). I'm sure I won't be the only one to jump on this one. The 1 kilo positive bag will be MUCH more positive than 5 kilos unless it is only displacing 1 kilo of water to start with (at 132 feet). 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. -----snip > -- Kevin -- > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. -- <<<<<<======------======>>>>>> Dave Mabry dmabry@mi*.co* Great Lakes Maritime Institute Underwater Research Team <<<<<<======------======>>>>>>
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