Mailing List Archive Mailing List Archive
>> I wrote: >> >> You should get some definite benefit for your mission to justify the >> cost and risk. > >Chris wrote: > >Is this not the same with all missions? - the risk is a function of >training, experience, fitness etc etc. and maintenance! The actual operational risk may in fact be less than open circuit, I doubt it, but thats something that time will tell. People may be so scared of these things that they just sit in their garages. Sometimes something is so dangerous it's safe. Bill and I go to great lengths before diving our units in semiclosed mode to verify that they are working correctly. On the issue of fitness this may, in the case of semiclosed constant mass flow, actually be contrary to your survival. The reason is that the fitter you are the higher your potential VO2max. In general the constant mass flow units are designed to only handle some upper VO2max, if you exceed this you run the risk of hypoxia or the bends. >How stealthy do you wanna be? I use my breather to photograph game fish, trout, salmon etc. These fish are predated by marine mammals and are extreemly sensitive to bubbles. I haven't actually tried this in semiclosed mode. It may be that the semi bubbles don't disturb the fish. However my experience free diving and open circuit diving suggest otherwise. For example when free diving if air escapes from my mask the fish bolt. By the way, Biomarine is comming out with 2 new breathers. The CCR500 and CCR250. These are fully closed circuit mixed gas rebreathers. I assume they are based on the CCR-1000, MK15, MK16 technology. Price is $5000-$7000US. I don't know how safe they are, but they are much more capable than the Drager unit. Barrie Kovish. Vancouver, Canada
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]