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On Fri, 12 Mar 1999, Mark Melendez wrote: > Anyway, it was suggested at the shop that I go with the 45# wings. Is > anyone using these in the ocean? After some quick calculations it seems > that 45# should do the job. The most negatively buoyant rig I'll be using > these with is: > > drysuit, double PST 95's, canister light -14 Ah, 40cf Al stage. > > At the beginning of the dive it seems (if my numbers are right) that this > gear will be about 31# neg. Plus I could always pump air into my suit. > > Does this sound right? Think about what happens if you have a dry suit inflation failure, or a leak. You also need enough weight to be able to stay neutral to slightly negative in the event you loose (or use up) all your back gas. I dive OMS 95s, which are close to neutral when empty. In the ocean with my drysuit and thick undergarment, that means adding a steel backplate and 8 pound V-weight to the total system weight. I can easily maintain deco stops with only 300 psi (about 21.5 cubic feet, or 1.7 pounds of air) in the cylinders. I know the PST 95s are a little heavier, but I don't know how much. I think, with a well designed wing, the primary concern with excessive lift is unnecessary drag. All of these wings are designed to work with double cylinders, so gas trapping is probably not a problem. What are the conditions like where you dive? If you're in high flow caves, you really don't want any more drag than you absolutely need. Halcyon also makes a 55 pound version of that wing, maybe that would be a decent compromise. -- Art Greenberg artg@ec*.ne* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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