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John- I never said that you need doubles for everything. Taking along a pony implies that you are going into deco, as 30 cubes is a lot of gas. If you are not doing deco diving, you should be able to make a free ascent directly to the surface in a low/no gas situation. If you are going into deco, even at 70', then you need doubles. Why? Because of the redundancy doubles offer for your virtual overhead environment, and the common sense decision to have enough gas to use Rule Of Thirds when doing deco. You can't do ROT using a pony anymore than you can with independent doubles. So in addition to: -If you don't think you need doubles then you don't need a pony. -If you think you need a pony then what you need is doubles. Please add: -No-stop diving then no pony. -Deco diving then doubles & ROT. This seems to make perfect sense to me and I really can't fathom why people would want to strap a useless unreachable air source to their backs. A lot of time, effort and money is spent by divers jousting with invisible dragons. Rather than dragging around a pony for no-stop diving, why not just check your air gauge once in a while, and head back to the up-line when you hit 1000psi? Is that too much to ask? And if you envision being caught in a wreck or snagged in a net and your foresight in bringing a pony saves the day, wouldn=B9t you rather not penetrate the wreck or get a knife and leave the stupid pony behind? Is this really a hard decision? Ponys strapped to your tank unbalance you, increase task loading, screw up your gear, make wings unworkable, etc. etc. So why use them if you don't need them. Jim Sender: John Brett Date: 9/7/98 3:23 AM >So we have Al's < 70fsw don't need a pony (acutally, the example kept gett= ing >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 th= at >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. ------------------------------------------------------------------- Learn About Trimix at http://www.cisatlantic.com/trimix/trimix.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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