Just from my experience there is a lot of manufacturing variation in what is assumed to be the "same tank", especially over a period of time. I have 38/40/42 types that are all over the place on buoyancy characteristics. I would have to say the book might be a little outdated on that subject at this point... (but still a dang fine book overall).Herman wrote:Hummmm, that does not jive with the measured amounts of my steel 38s. They are around 2 lbs neg full (1800) and 2 positive empty. That includes the manifold and 2in1 backpack. Almost a prefect amount for me.
Automan wrote:I tend to just use this calculator for new and old tanks
http://www.subaqua.co.uk/cylinder-buoya ... s=imperial
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