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http://diverlink.com/gear/tanks.htm Don Burke Chesapeake, Virginia ----- Original Message ----- From: Bob Cooper To: techdiver@aquanaut.com Sent: 09 December, 2000 11:56 Subject: buoyancy characteristics of aluminium cylinders I'm trying to work out the buoyancy characteristics of aluminium (Luxfer) 12L cylinders (the sort which are regularly used in the Red Sea). I'm off to Sharm over Xmas and will be twinning up a pair of 12L cylinders to be used as independents. Question is, what will the buoyancy characteristics be like? I have worked out that a pair of these cylinders will be POSITIVELY buoyant by about 4.2kg when EMPTY and NEGATIVELY buoyant by about 2.2kg when FULL. If this is correct it means a great deal of lead will need to be carried on the weight belt to compensate for the positive buoyancy when empty (no backplate). Does anybody know the exact weight/volume and dimensions of these cylinders? I think they are generally referred to as an "Aluminium 80". If they are BS5045:Part 3 cylinders they should have a diameter of 204mm and a weight of 16.48kg. Has anybody got any information or had experience of diving doubles in the Red Sea? Bob UK diver _____NetZero Free Internet Access and Email______ http://www.netzero.net/download/index.html -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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