Luxfer Al30 Changed Dimensions?
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That's why I'm 
Luxfor buoyancy: -1 and 1.2, old; compared to -1 and 1.3, new.
Doing the actual arithmetic, the new bottle is .43" wider and 2.55" shorter, so that's more significant than indicated with first look. However, it is not intuitively obvious to this casual observer how that impacts. (not trolling, I just don't get it.)
Edit: Are you guys discussing the differences between Luxfor old and Luxfor new? Or between the Catalina and the Luxfor new?
Luxfor buoyancy: -1 and 1.2, old; compared to -1 and 1.3, new.
Doing the actual arithmetic, the new bottle is .43" wider and 2.55" shorter, so that's more significant than indicated with first look. However, it is not intuitively obvious to this casual observer how that impacts. (not trolling, I just don't get it.)
Edit: Are you guys discussing the differences between Luxfor old and Luxfor new? Or between the Catalina and the Luxfor new?
OP
Jax, that more-than-quarter-inch larger diameter translates to a significantly greater cross-section. You can really notice the additional bulk of the fatter tank versus the narrower tank when you alternately sling each. Someone carrying an U/W camera (say) might really appreciate/prefer the narrower cylinder, AOTBE.
Ronald
Leadking
Contributor
That's why I'm
Luxfor buoyancy: -1 and 1.2, old; compared to -1 and 1.3, new.
Doing the actual arithmetic, the new bottle is .43" wider and 2.55" shorter, so that's more significant than indicated with first look. However, it is not intuitively obvious to this casual observer how that impacts. (not trolling, I just don't get it.)
Edit: Are you guys discussing the differences between Luxfor old and Luxfor new? Or between the Catalina and the Luxfor new?
I have not seen/dove the "new" Luxfer cylinder. I see from your profile that you are relatively new to diving. There is much more to a cylinder than outside dimensions. You should read the posts about 7.25" cylinders vs.
8" cylinders. 8" cylinders have almost a 25% greater (50.24 square inches) surface area vs 41.26 square inches for a 7.25 cylinder. Add to that the leverage factor (the further it is from your center of gravity the heavier it feels) and it is a really big deal. Use the concept of putting a five lb weight at your side vs holding out at arms length.
Keep reading ScubaBoard, it will help you understand a lot of the nuances of cylinders.
The truth will out! 
Stick with AL40s be done it
(I don't know a single diver in S FL using AL30s as stages, 40s are 80s are the gold standard for stages)
(I don't know a single diver in S FL using AL30s as stages, 40s are 80s are the gold standard for stages)
Stick with AL40s be done it
(I don't know a single diver in S FL using AL30s as stages, 40s are 80s are the gold standard for stages)
I know quite a few people around here who like 30s for O2.
OP
Stick with AL40s be done it
(I don't know a single diver in S FL using AL30s as stages, 40s are 80s are the gold standard for stages)
Thanks, Deepstops, but, while slung Luxfer Al40's have worked well for me as deco cylinders for the type of (modest) tech diving I've done, I'm interested in an Al30 to use as a slung pony/bailout/buddy bottle for deeper (but not deep) open water recreational solo walk-out dives, when carrying an U/W camera--you know, as a companion for a steel '72 or a HP 100 single back cylinder. (See my note that started this thread and also http://www.scubaboard.com/forums/advanced-scuba-discussions/376428-al-30-al-40-a-5.html#post5821139.) I'm satisfied that an (old-spec) Al30 will work perfectly for me for this.
I have absolutely no interest at this time in best choices for stage bottles. I never anticipate ever diving a stage bottle.
Ronald
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