| Will an air integrated computer provide this information?
I just find that there are way too many variables to take into account to get an accurate idea that is readily reproducible, especially as I tend to dive triangular profiles anyway. You not only have to take constant changes in ambient pressure into account, but also changes in personal work rate too. My feeling is that if you try to do a calculation where there are two unknown, or at least poorly understood variables to worry about, the end result is going to be subject to some pretty significant limitations.
The best I could come up with was to strap my rig on, complete with mask (so no nose breathing) and do a very brisk walk around my yard for 10 mins, not getting completely breathless but, with a 15L on my back, working reasonably hard and blowing a bit and noting the change in cylinder pressure then doing the calculation. That way, I'm guaranteed that the test is run at constant ambient pressure and at a constant rate of work on my part.
I also did the same thing, only taking a gentle stroll, to simulate a relaxed bimble in still water.
I've tried the other in-water methods and found such a wide variation that it's not something I'd trust as being reproducible.  |