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I know the DIR recomendation is to use double alloy 80's. A couple of years ago I bought a new set of doubles after a fair bit of research and came up with Faber 100cu ft steels. I thought I might share the stats with you, because I think these are a worthwhile alternative to Alloy 80's. But then I may be mistaken. I'm sure I'll find out. Volume: 100cuft W/C: 12.2l Pressure: 235bar Tare weight: 13.2kg Boyancy empty: 0kg Boyancy full: -2.5kg or so (how much does air weigh - 900g/kl ?) Height: 650mm base to neck (with a rubber boot - they have a round end) Diameter: 180mm With these you need a lighter weightbelt than alloys by about 3-4kg, but most people still need a 3-4kg belt. They don't float up when they get empty, they don't feel heavy under water. With a little air in your BC you can take your doubles off under water and they are close to neutral. I also find them physically smaller than alloy 80's and when you add their weight plus the lead on your waist you are carrying around a fair bit less - which is handy getting back into a boat on a 2m swell. The extra 20cu ft each is worthwhile for deep dives. Regards Guy -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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