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A full face mask can be difficult to breath using a rebreather and because you have a larger gas space in the mask compared to a mouthpiece, there can be face squeeze problems. There are the problems of leaks as well. Using a mouthpiece to learn to dive then unit does not present these problems. And a mouthpiece is what a diver is accustomed to from OC experience. Breathing a FFM with OC is a totally diifferent experience from using one with a rebreather. With open circuit you have on demand gas as much as you want. With a FFM you will likely have to work harder to get the gas than with OC. BTW, you can experience shortness of breath with a mouthpiece with these units as well. I believe that the 150 cutoff was Kevin's way of indicating that he would be using air above 150 with the FFM and would not get the "donald duck voice" that helium produces on deeper dives. He wants to narrate films underwater and sound serious. On Sat, 10 Aug 1996, Bill Brooks wrote: > Rod Farb wrote: > > > > >you need to get rid of the FFM > >and dive the unit with a mouthpiece for many hours and then come back to > >the FFM. You may still experience what happened to you at depths shallower > >than 150 (your cutoff for FFM use) under some conditions with a FFM. > > Why do you feel that the relatively inexperienced rebreather diver should be > using a mouthpiece rather > than a FFM? Is this a private recommendation to Kevin because of his beard > or is it a general recommendation for all rebreather divers? > > Why do you place depth limitations on the FFM? > > Bill Brooks > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >
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