Ha ha, yeah that's not such a bad idea, maybe call it "SCUBA for Gigantic Nerds." I mean, I'm an engineer at heart so just can't pass up an opportunity to over-analyze some physics problem.I think we need a new forum; “over thinking scuba”
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Ha ha, yeah that's not such a bad idea, maybe call it "SCUBA for Gigantic Nerds." I mean, I'm an engineer at heart so just can't pass up an opportunity to over-analyze some physics problem.I think we need a new forum; “over thinking scuba”
Exactly. When I started diving there was no BCD. So buoyancy was never neutral, and you could keep a constant depth only dynamically, kicking and also using hands in what was called "opposition movement".Anyway ... still looking for more. I'm still even more interested in the stability of it all. And yes, there is something called Dynamic Stability ;-)
Kinda basic though :-(The Wikipedia entry is pretty good: Diver trim - Wikipedia
The buoyancy vector will be located at the diver's center of buoyancy, which is the center of the volume of water which they are displacing. The gravity vector will be located at the diver's center of mass.
Well, everything beyond the basics gets swamped by factors such as an individual diver's physiology, position, muscular contraction and the ever changing amount of air in the lungs; environment conditions such as currents and wave action; the movement of air in wings and drysuits and its expansion and contraction in these as well as neoprene as depth changes.Kinda basic though :-(
Right.Tell me if I'm wrong here ... at the end of the day, the only possible trim-stable (and at the same time granting trim and buoyancy equilibrium) configuration is the one where both forces have equal magnitude and are vertically aligned in such two points like here (i.e. Fb=buoyancy applied on the upper point and Fw=weight down):
View attachment 618184
right?
Almost every gear we attach to ourselves underwater (weight belt, wetsuit+hood+gloves, fins), each singular piece has uniform mass distribution. Hence they can be dealt with as discrete components, which is easy.Consider an object of uniform density -- anything made of a single material, like a block of lead or an empty water bottle....
Yes and no. Mostly yes, but we must acknowledge some complexity.Tell me if I'm wrong here ... at the end of the day, the only possible trim-stable (and at the same time granting trim and buoyancy equilibrium) configuration is the one where both forces have equal magnitude and are vertically aligned in such two points like here (i.e. Fb=buoyancy applied on the upper point and Fw=weight down):
View attachment 618184
right?
I agree, a compromise is what we're looking for ... always.In the end, there is no exact mechanical solution for trim because the moments are constantly changing. What you are looking for is a compromise that allows you to use your body to make the final adjustments without wasting too much energy.