Sounds like another "solution" in search of a problem. I can't imagine why the deflate process would need to be powered?
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I was deflating as we were ascending, but it didn't feel like was dumping air. I ascended a few feet and switched to the manual deflator. It didn't help and I again rose a couple feet. At this point, I was in trouble and at about 40'.
I'm a bit freaked out with my BCD now. It was like it was retaining air that it couldn't release. This is only my 4th dive with it.
Aluminim tanks become positive buoyant when air is used up. Do a buoyancy check with a near empty tank next time.
under water some where
Please excuse my ignorance....but how does a power deflator actually work?
All tanks become more positively buoyant as the weight of air in them is decreased by you breathing it.
Yes all tanks do become more positively buoyant, but aluminun tanks do not result in any negative buoyancy when air is depleted. I was making a general statement that aluminum tanks do not contribute to the negative buoyancy and can in fact add buoyancy at the end of a dive. Thus requiring an additional 2lbs of weight to counter the positive buoyancy.