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Aluminum 80's with a stage bottle = 104's. Juast make sure everyone is diving small tanks and that you have balanced the rig so that at <500 psi you can still stay down. Usually with 80's you can do that with a cave light at -7 to cover the +6 of the empty tanks, and either a steel backplate at -5 , a wedge at -7, and a soft belt if you are trying to offset either a drysuit or a big wetsuit. Normally 80's imply warm water cave diving. Otherwise you can stick any number of blank steel plates under your backplate to build the weight up to what is needed. 80's are great if you have to walk around or if the cave is smallish. 80's with a wetsuit gives some serious speed on a scooter, in the 200 fpm plus range, and then outrunning the gas becomes a consideration. bwilliams@ib*.bm* wrote: > > >From the DIR perspective, is there any reason I'm not thinking of that > would advise against using smaller 7" diameter tanks for doubles ? My 104's > are much too big and heavy for the average cave dives here in Bermuda's > shallow caves particularly for wetsuit use most of the year. I'm > considering 72's or OMS 85's but wonder if the big gap between tanks > necessary to accommodate the Diverite manifold spacing presents any > convolutions I'm not thinking of ? > > Anyone ? > > Bruce Williams
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