I replied last night a little hurriedly. Its all about displacement
an AL tank has a larger surface area therefore displaces more. If itwas just about weight then fat people would sink like a stone and skinny people would float - ask anyone has taught diving
, the opposite is more often than not true.
Now the more important issue here is the wearing of a BCD. It is crazy NOT to wear one. You will only need to surface 2K down wind
from your boat in a chop to never forget that swim !. Not to mention a cramp or sickness whilst at the surface. A lot of diving
accidents happen at the surface. Steel
V Al is a personal issue wearing a BCD is a safety
issue. If you use your BCD to maintain neutral buoyancy throughout your dive you will use less air and therefore be able to dive for longer