captain wrote: ↑Wed Mar 20, 2019 10:50 amWithout a pressure gauge unless you know exactly how many times you can decant from the reserve tank and still have sufficient air to safely finish the dive from a given depth you could end up decanting yourself out of air.
A J reserve is not depth/pressure compensated, it doesn't know if you are at 10 feet or 100 feet when you pull it. You need to maintain the equalized pressure above ambient depth pressure in order for the regulator to supply air. Once the equalized pressure is is the same as the pressure depth you are at you are essentially out of air at that depth.
This would be the same as using a tank with no reserve and breathing it empty. The only air then available is that which becomes available as you rise into a pressure depth less then tank pressure.
captain wrote: ↑Fri Mar 29, 2019 10:53 amI can not see how Roberts came up with that. There is no way water pressure can act on the spring. The stem of the J is just a cam that rotates that compresses the the spring or releases it. The stem can not move inward which it would have to do to increase pressure on the spring.
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