i'm not 100% sure on that one. I think it would have to do with other variables including the surface area they have available for gas exchange, how fit they are (as in, is their higher RMV due to lack of fitness or are they just a bigger human, etc..) I know that some people say "lung size doesn't matter", but seriously, how many tiny women do you see outbreathing their big huge 6'6" dive buddy? if i breath at a similar rate as my supersized counterpart and my lungs are tiny, my consumption rate will be different, but he has higher surface area inside his lungs to in-gas off-gas. this one is better left to people much smarter than me to answer
but, back to the computer, the adaptive algorithms are basing it on an increased work load, above what you set as 'avg'. it is constantly calculating, so if your consumption skyrockets, it will calculate according to your rate at that given moment. it can't predict anything, it's basing it on hard numbers.
again, what it is telling you is simply a number based on what it has calculated you need for decompression (constantly being updated) and if you have set a 'reserve' (to be on the surface with pressure) how much time you have before you need to start your ascent taking into account deco and ascent time to make it to the surface with the amount of gas you asked it to calculate these numbers around.
if you think you'll need 2000 psi to get you and your buddy home from worst case scenario, then you tell the computer to warn you as you approach the psi that will allow that... Yes, it will mess things up bit if all of a sudden your consumption rate doubles (if your buddy is sucking down you gas), it's only as good as the data it's getting. by then you are not gonna be worrying about how many minutes the computer is saying you have, you are gonna be running for home... it will still calculate deco for you, ya, it may not be exactly correct, but it will be more conservative if anything.
Mattleycrue76 wrote:ljjames wrote:depending on your algorithm (on the uemis its a ZHL 8+), if it's adaptive, when your consumption goes up, your deco will go up as well. the uemis takes this into account when figuring how much gas you need to get to the surface considering added deco due to consumption AND the increased consumption itself.
increased consumption implies heavier workload, heavier workload implies more ingassing... more ingassing implies more deco...
So then, when planning a tech dive wouldn't a person with a 0.3 RMV use a different set of tables than a person with a 0.7 RMV?
Also how does the computer predict at what point in the dive and by how much the air consumption will spike (in an emergency) in order to set aside enough gas for that situation.
Just telling me that my remaining air time is now less than it was before is of little help if I don't have enough gas left to get me (and maybe my buddy) to the surface/deco bottle.