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At 11:30 PM 24/07/1998 -0400, Thomas A. Easop wrote: >As to why buoyancy might change with a change in position: it is simple. Sometimes >when you change position, you do change the depth that the wing and the 'bubble' >are at. If you are doing a 10fsw/3msw deco stop, and change position from a prone >swimming position to an upright sitting position, the wing could actually change >depth by as much as a foot. (If you are one of the herd of deco divers holding >onto the anchor line, or leaning on a deco bar, you will not notice the subtle >change in buoyancy. You notice it doing a free floating hang, under an SMB.) The >bungees help because first, with the little bit of added pressure in the wing, the >bubble will not expand as readily when it moves up a little. Also, I believe, as >some of you point out, the bunged wing 'limits' you ability to change position. >This in turn limits the wing from changing depth. I have done enough free floating >hangs, and messed up enough of them too, to know that this is fact. Thomas if you use more stable wings - the flat kind that wrap up around your tanks, you will find that any air in them remains at the highest point of the wings and provides a buouyant fulcrum under which you can easily hang. If you constrict the wings with bungy, not only do you compromise their performance should you need lift near their maximum, you also keep the lift (that any entrapped air may provide) beneath the tanks, thereby decreasing rather than increasing stability. rgrds billyw -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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