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>Al, I was looking at the header: 71 doubles or a 151 single. I have no >idea where in hell you get a 151 single but I will bet that the 71 >doubles would be a cheaper (and better) setup. I have a saying about >pony's: 7 LITRE doubles, vs 15 LITRE single. l being the abbreviation for Litres, and indistinguishable from a 1 in some fonts. 7 litre ~ say 60 cuft 15 litre ~equiv to your 121s FYI - in the UK, there isn't much price difference between cylinders. A 7 litre will cost me ~120 UKP each, the 15 about 140 UKP. So we have Al's < 70fsw don't need a pony (acutally, the example kept getting shallower, but ...), and Jim's need twinset for everything. A number of divers, here, (stricly recreational) do 30m (100fsw) 'no deco' wreck dives, and take the pony as a bail-out for an emergency ascent. The argument they put up is that doing an emergency ascent at the end of a dive (when their computers say they're at the no-stop limit), its much safer to have _some_ gas with which to do a controlled ascent/put in a stop. Twinset, single+pony, single, don't do the dive? John Brett (who has never used a pony) -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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