Twin 7.6Ls

[Richard Mason]

I have recently acquired a pair of 7.6L x 260 Bar steelies, made by Catalina (which was news to me as I thought they only made Aluminiums).

I've got them set up as Indies with a pair of Oceanic Omegas and intend to take us all for a spin on the weekend, along with ClassyChic and her long-suffering husband Nick, for a try-out, mainly for weighting purposes, at a local shore dive site 10 mins from my house (Also a Marine Reserve which makes it pretty cool), max depth about 10m.

I normally dive with a 12L or 15L which in the water are identical buoyancy wise. Only trouble is, I've no idea how much weight to think about removing from the belt to achieve something like neutrality with the twins.

I seem to remember seeing a table somewhere which compared weights, density, relative buoyancy, shoe size and inside leg measurement etc etc for a whole heap of different makes, size & WP of different cylinders.

Does anyoe know where I can find this, or failing that, have any suggestions as to the differences in buoyancy between a 12L steelie on the one hand and a pair of 7.6Ls on the other, or failing that even, 7Ls or 8Ls, so I can interpolate?

[Reikimaster]

this one?
UK Scuba - Cylinder Buoyancy Calculation

(note i think it excludes the weight of the valves)

[Richard Mason]

Originally Posted by Reikimaster

this one?
UK Scuba - Cylinder Buoyancy Calculation

(note i think it excludes the weight of the valves)

Ta. That's the one. My 7.6Ls must be one out of the left field box, they are an unusual size - never seen em before.

[digital_steve]

you and the CC family are attached at the hip!
did someone mention swingers?

[Richard Mason]

Originally Posted by digital_steve

you and the CC family are attached at the hip!
did someone mention swingers?

No, and if I were you, I wouldn't either.

[NotDeadYet]

Originally Posted by Richard Mason

Ta. That's the one. My 7.6Ls must be one out of the left field box, they are an unusual size - never seen em before.

Are they Septic cylinders? It's probably a metric conversion from a square foot sized bottle.

[Dr T]

Originally Posted by NotDeadYet

Are they Septic cylinders?

you can't call his tins sh!te



a

[Richard Mason]

Originally Posted by NotDeadYet

Are they Septic cylinders? It's probably a metric conversion from a square foot sized bottle.

Nah, stamped as BS5045 compliant and with a metric WC stamped on them. Actually, had another look last night, they're in fact 7.7Ls.

[Richard Mason]

Originally Posted by Dr T

you can't call his tins sh!te



a

Why should he be any different?

[digital_steve]

Originally Posted by Richard Mason

No, and if I were you, I wouldn't either.

i already did!
scallops were great btw... cleaning them sucks