I am still leaning toward getting an inline octo, as long as I can find one that can *vent* the wing at the same time as breathing. Inflating I don't think is the largest issue on an ascent, assuming people are weighted correctly, we'll be kicking up with purpose : ) but venting to control the ascent is what I'm concerned about.
I'd like to hear more from the posters who have posted how they can vent and breath at the same time with the Air3. Who makes the Air3? Scubapro only shows the Air2 which I'm familiar with. As far as inflating on ascend, it may be needed because the OOA diver is truly OOA and there's not enough air in his/her BC to begin ascend even with ditched weights. You'd have to use your BC to bring both of you up until there's enough wetsuit expansion/air expansion to begin deflating both persons' BCs.
Taking the inline octo out of your mouth to vent isn't that big of a deal IF you've practiced multiple times with your equipment configuration AND you're somewhat skilled diver. With so little dives under your belt right now, even if you're in DIR configuration, it'd still be tough to rescue somebody. Equipment does not take precedence over training and experience. Equipment does help, but never a replacement for training and experience.
If you're that worried then get a short LP hose with a regular octo and sling it around your neck. It's out of the way and there for you. I have an octo on a short hose like that in my kit bag if I were to dive with people whom I am unsure about their skills.
The question is simply this: do you prefer one less hose or do you prefer ease of sharing air? If you like the former then KNOW its limitations. If you like the latter, then you know what you gotta do.
I've watched some videos on hose lengths and regulator setups, and have am currently considering a 40" for my primary and under the right arm routing, rather than the 5' or 7' routing which wraps the hose once around the body.
The 5ft-7ft hose was meant to deal with tech divers. In wrecks or caves situation where one diver would need to trail the octo back to the front or rear diver. Or even in open water, they'd usually pack double tanks and maybe a third or fourth deco/bailout tanks too, so separation is nice.
As a rec diver, most of these things don't apply to you. I use the 40" Miflex hose. It's highly flexible and it gives me plenty of extension from my sharing air partner. Also, depends on which diving philosophy you adhere to, having a distressed diver close to you isn't necessarily "bad". Body contact tends to calm down the distressed diver. I've taken rescue classes from PADI and NAUI. They all advocate keeping the distressed diver close to you so that you can calm them down and help control them since that they may just say the heck with it and quit doing anything. Obviously the technical divers are a lot better trained and conditioned. They'd prefer to swim side by side but further apart.
There's a reason why tech diving technique is a lot different than rec diving technique.
Although I am not experienced enough to really have an informed opinion about this, having to go through the extra step of unwrapping the primary to donate it to a panicked buddy sounds unwise (I can hear the comments coming :blinking
or it at least makes me uncomfortable. It seems like a panicking buddy could grab it and it could turn into a noose if wrapped around the body, or in trying to unwind it I could catch it on my mask or snorkel.
Once again, it's all about training and practicing with your configuration. And yes, for a rec diver, especially an inexperienced one, having all those hoses around is a disaster. I've seen it.
So, with the 40" under the right arm routing they suggest a 90 degree elbow or swivel, which points the hose downward- the swivel in either they say makes the mask hose move more freely and thus it is easier to turn your head. That's what I've learned, and am ready to unlearn it given more information- kind like the DIN valve...
I've seen this configuration done. It keeps the 40" hose under your arm and out of the way so that there'd be less entanglement possibility (though as a rec diver, I can't imagine what entanglements you'd encounter). And sometimes it does help with relieving the stress on your jaws.
I use the 40" Miflex hose, but I just let it loop outside. I've been diving this configuration for four years now in California water. I have yet to have that hose snag on anything, be it boulders or giant kelps.
Once again, it's back to you and your preference. See if the shop would rent you one of these regs with the 90-degree elbow and see how it feels for you.
Whatever method and configuration you choose, I'll say it again and again: practice, practice, practice and then practice some more. Don't wait until an emergency comes and try to do things. You can be all geared and rigged out like Mr. GUE because the cool cats told you that it's the safest and best configuration, but you've never practiced donating air or rescue attempts, then it means nothing.
But you know what's the best way to solve emergencies? Don't have them in the first place. That means you dive within your comfort zone until you're ready to push your comfort zone bubbles a bit and expand the boundary. That means you choose your dive buddies most judiciously and make sure they understand your needs and you understand theirs.
My first dive buddy was a 500-dives person. He was a very skilled diver but he was a crappy buddy and mentor.