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You weren't disrespectful, Richard ... frankly I came across a bit stronger than I meant it to. Sorry ... it's been a really stressful week.I didn't mean to be disrespectful. But those are exactly the circumstances I have to deal with on every single dive. All of the adults in our herd have 7mm wetsuits and HP100 tanks. It is the only scenario I care about. If I can solve this situation, all of the others are a cake walk.
You're right, of course, the swing of an HP 100 is around 8# if we think about it going completely empty. Using 7.5# is more realistic. But it doesn't change the math; one wing will not lift 2 divers from some depth.
The more important question is from what depth will one wing be sufficient? I have no idea... But it better be 60' if using a single wing is going to be taught to OW divers with the admonition that they better think about the problem if they are using wetsuits at greater depth.
Richard
You made a good point that any attempts at rescue will be situational ... and will almost never go the way the book says it should. You will be tasked, stressed, and needing to make snap decisions ... and no matter what you do, you'll end up second-guessing yourself later on. That's the reality of a rescue ... even a successful one.
However, in the context of teaching someone how to affect a rescue, one must consider not only the available tools, but the ability of the diver to use them well. Task-loading a new diver reduces the chances for a positive outcome. With that in mind ... (a) keep it as simple as is needful, and (b) remember that the objective is to get the victim to the surface, where you can help them. So unless it's absolutely needed, you only want to use one BCD. For the reasons I specified earlier, it's better to use the victim's BCD for buoyancy control. Only use yours if it's absolutely necessary to initiate the ascent. Remember, the more air you put in those things, the harder it's going to be to vent it and control your ascent ... you're going to have your hands full just maintaining a grip on the person you're trying to ascend with.
Practice it ... try it both ways ... decide for yourself which is easier.
... Bob (Grateful Diver)