I don't think you should have an issue answering this question if you were nitrox certified. Maybe i'm just reading the question wrong, but what does this have to do with Sidemount?
You read my mind
---------- Post added June 4th, 2013 at 04:24 PM ----------
I use 28% Nitrox for dives at 130' which requires an Advanced Nitrox Card to obtain the gas.....so, yeah, if at all possible I'd use nitrox for the 130' dive in order to increase bottom time....
Who requires an AN card for 28%? I'll be sure to avoid them...
---------- Post added June 4th, 2013 at 04:31 PM ----------
Thanks so far for a input. Sorry for not being clear about all the information on my last post. I am planning to do those dives on the same tanks if possible. 2 HP 100 steels in the Great Lakes (cold fresh water). For 130 ft with ppO2 1.3 mix will be 26 but for 80ft is 38. So how do I adjust the mix when doing sidemount?
Don't do this. It's not the proper way to do things. Lets say you're at 130' and suffer a complete gas loss of your 26%. What do you have left? 38%? Good luck with that. So now you're really at 130' with only one tank, no real/proper redundancy. Sure, you can shoot up to 80' while you're switching to your backup gas, but do we really want to start planning your dives this way?
I know it's not convenient. Life sucks. But take two tanks of the gas that will support you at all stages of the dive. That's really the reason for sidemount anyway right? So, 26% at 130' is good all the way from 1' -130'. But, 38% isn't.
This is the reason why so many of us have so many stupid tanks. It sucks, but there's a right way, and a way that doesn't allow for the ****e to hit the fan. Always plan for the fan splatter, and you'll live.
---------- Post added June 4th, 2013 at 04:33 PM ----------
Are you going to take along only two tanks to be used for both dives- no refilling between dives? In that case, I'd probably do both on ean32 and be done with it. Otherwise, I'd use ean36 for the second dive.
In my opinion the difference between 36% and 38% is not worth the hassle...
Yes, I'm aware 32% at 130' yields ppo2 of 1.6, IMO for a single day of diving it's fine- that's what I usually dive...
Sent from my myTouch 4G
What agency do you teach for? The reason I ask is that what you just posted is opposite of what every agency out there teaches. OP, don't listen to this. It's possible it could get you in trouble.
---------- Post added June 4th, 2013 at 04:37 PM ----------
I probably failed to read in OP anything concerning such cold water and below stellar vis, as well as anything about great lakes and the such.
My apologies, I dive nothing less than warm tropical waters, stay away from anything below 25 degrees celsius and/or below 20m visibility.
Anyway, the original poster has a very weird way of asking questions, not explaining exactly what he wants or providing important information.
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Yah, that disclaimer makes it all better. NOT!
Guys, making a full day of dives at 1.6 very possibly could kill you. We have no idea what your health is, what meds you are on, what water temps, work loads, currents, etc. are for you in a given day. Neither did NOAA. That's why it's recommended not to exceed 1.4.
Dear God, if this isn't the perfect thread for why you shouldn't learn to dive from Scubaboard, I don't know what is.
WOW!!!