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>************************************************************************ >Dave, > Noone has figured out a way >to key gas addition to RMV for a true mixed gas rig other than by using >electronics, sensors, etc.. Actually, the LAR V isn't keyed to RMV at >all, it's keyed to bag volume. The LAR V is a great rig - SEALs love it >because it's simple and rugged. But, it's a shallow water UBA only. > >Gavin<< Bill, Agreed about the LAR V keyed to bag volume and its popularity with many military divers. Of course it does have depth limitations. As to your point about there not being a rig keyed to RMV without electronics, that's not really the case. The Fenzy (French unit) was keyed to RMV by use of a bellows within a bellows, the BMD SCR-4 used a proportional discharge valve, AND the RBC Odyssey which not only is keyed to RMV by use of a compound bellows counterlung, but is also depth compensating. In all three cases gas addition is done passively on the next inhalation by a demand regulator.-Dave.
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