cocoajoe
Contributor
Been thinking for a while about a redundant air source. I'm thinking either 19 or 30cu ft. What are advantages (other than less/more air) disadvanatges if any?
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I use a 13. I use a Metalsub quick release to attach it to my HP100. The short cylinder allows my main cylinder to fit in most tank racks on liveaboards and day boats, bith the cut off PVC as well as the roll control style. A 19 is too long, and a 30 is right out. To me, the 13 is enough to make a direct ascent to the surface from any depth, and certainly allows for a safety stop. If I'm deco diving, I consider a 40 of an O2 blend right, but that's an answer to a different question. Huffers have to consider their air consumption, I have a pretty good SAC for a fat 50 year old.
... for a fat 50 year old.
This will sound snotty as hell, and it's not meant that way, but if you're incurring a deco obligation by mistake, you need to go back and re-learn to dive. Or, take a deco class so you will know what you don't know and you'll know that a 19 is relatively innapropriate for a deco gas bottle.
If I used a 19, my main cylinder wouldn't fit in a tank rack on a dive boat, and if I used a 30 it wouldn't fit even more. The 19 and the 30 are far taller than a 13, and remember, I keep mine attached to the main cylinder. If you sling it or keep it in your pocket or something you won't have a problem with cylinder length.
19 & 30 won't fit in rack, got it. As for your "go back and learn how to dive" comment....no but you could use a refresher course in social skills
no but you could use a refresher course in social skills