Mr Carcharodon
Contributor
victor:Is the idea to have no ditchable weight?
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No the idea is to have just enough ditchable weight to get neutral at the heavist point in the dive. So on a single tank your bouancy will shift by about 6 pounds as the air in you tank is used up. So if you ditch six pounds at the begining of the dive you should be neutral.
Having more ditchable weight will result if a very rapid trip to the surface in the event your weight needs to be ditched. And that is certainly unsafe as well. Also generally shifting the weight off middle of the body improves trim which results in more streamlined effcient swimmng.
A.