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> I am planning a Trimix dive to around 65m./ 213ft. with a relatively long > bottom time. I was thinking of dedicating a 5.6lt/40cub.ft pony tank for > dry suit use. However I can not figure out a way to calculate the > required gas needed. If you don't have the personal experience with your system to know how much gas you need then you shouldn't be doing this dive. > I am aware that the volume depends on the size of the suit (DUI cf200 > medium), the weight you are carrying, the profile of the dive and the > fit of the suit... There is no way to calculate your buoyancy gas requirements except from experience. It depends on how you control your buoyancy. If you like to add and purge often then you will use more than if you like to try to minimize the usage. It depends on you rig: if you use aluminium tanks your buoyancy gas requirements may be different from using steel tanks. The way you do your decompression and the sea conditions may affect your usage. Do you like to hang slightly negative on a surface buoy or do you like to try and stay neutral. The temperature may affect your usage. On cold days I find that regularly dumping and refilling my suit helps me stay comfortable. How much clothing you wear under your suit will also affect your buoyancy. Having said all that, I normally use a 3L pony for my drysuit inflation and on dives to 50m with bottom times around 30 to 45 minutes, I've never used more than 30 or 40 Bar for buoyancy. That's less than 20% of the cylinder's content. Alan -- Alan Wright IRVINE!ENG1!Alan@be*.at*.co*
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