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> A valid question. Consider how the force exerted by the buoyancy > compensator is distributed. The buoyant force exerted on the diver is > not located at the actual center of buoyancy in the bladder but rather > is distributed through the wing material to the grommets, bolts, > backplate and to some extent through the harness. Hadn't gone that far with it, but you are right, the force will act on the diver thru the attachment points. > or more accurately the neccesary torque when > pivoting, such as to negotiate a restriction, need only be equivalent to > the sum torque exerted by the wing until it reaches zero or a positive > value in the direction you are trying to pivot. When > pivoting to a sideways orientation, the air within the bladder is > preferentially distributed to the upper wing, which is acting on the > attachment point on the backplate. Intuitively (more > conjecture), it would seem that the effort required to overcome inertia > and drag would be equal or greater than the torque factor, which drops > out of the equation after about 30 degrees of roll (at > an estimate). What does this mean in the real world? Probably nothing. Ok, I we are making different assumptions then... I was thinking of the case where there wings are more full, thus the air can not simply "shift" to another part of the wing. At that point you are stuck with "levering" the air mass, you cannot let it readjust itself, it doesn't have the room. And levering work comes down to how long the lever is. Otherwise, yeah you are right, although it would be more that, say, to do a barrel-roll, you would be pivoting around the air mass, not pivoting it around you.... Again, as you say, none of this is a huge deal, but then again, I didn't see these as faults neccesarily in the bungee wings. I'm just waiting for someone to say they are bad because they are the wrong shade of black :-) Seriously, it seems to get that silly sometimes. For me it comes down to 2 issues... added risk of entanglement, and then being sure that inflation-restriction measures do not endanger the end-purpose of the device, floatation. Mike -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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