cool_hardware52
Contributor
Er, Tobin, when I've weighed a full Luxfer 80 it came in at about 38 lb., not 33.5. IIRR empty weight with valve is given as 31.8 lb., so adding 5.8 lb. to that would bring it to 37.6 lb. I don't think doubled Al80s make a lot of sense around here, given drysuits and the amount of weight we have to wear - I've always read of them being a warm-water rig (I should be so lucky).
Guy
Oops. I shouldn't post math examples when I'm pressed for time. I was using the empty weights, not full.
The concepts still holds, i.e. aluminum makes poor ballast, and 2 x al 80's result in a heavier rig then 2x steel 100's when one includes the required ballast.
As others have mentioned al80's do have some pro's, cheap, and a future as stages, but for smaller diver they don't reduce the "Standup and stagger through the surf weight"
Tobin