Boxcar, Not jumping on you, but truly curious... how do you find a simple loop of hose that slides right off the back of your head (assuming you're not wearing a snorkel) and extends out a good 3 feet or so in front of you; is more complex and dangerous than reaching for a reg that is tied off somehow to your Dring, pulling it out, but you cant extend the hose any further from your chest until you reach back and pull the hose out of a bungee that is tied to your tank?
My 2nd stage is attached to a rubber necklace that I have modified to make the neck gap smaller, and fit within my D'ring. So pulling it off my D ring is similar to pulling a reg out of a commercial rubber necklace, if you know what I mean. It is very simple. If I am prone It takes one move of my arm to have my reg extended. If I am not, my arm makes one simple curling motion. Regardless of how simple the "behind the neck method" may be, it is more complex than my method. The hose easily comes out of the bungie on it's own as I deploy it. Let me ask you this, have you seen people stuff the hose down their belt when they didn't have a cannister to loop it behind? It's the same thing, except the belt is around my tank, and made of rubber, (it's actually a cut cross section of a car inner tub). Perhaps I haven't done a good job of explaining it.
You don't see the possibility of the long hose coming out of your storage behind you and getting caught on something?
I don't see it as likely, nor a particularly bad problem if it happens. You have to remember that a 5' hose isn't very big for a 6'3 male. I really barely need to tuck it in the first place.
Now a little jump on ya:
who called you a liar? You are the only person slinging that word around
When I clearly have said that I have tried both systems, and someone says that it is clear to them that I haven't, that pretty much speaks for itself. But we're past that.
I have never seen anyone with a long hose who has trained with it have any kind of problems or complaints with donating air.
You say you practice OOG drills @ a safety stop, how do you restow your 5' reg? seems like its a bit easier to loop the hose behind your head, and tuck in in your belt or under your light. No contortion or buddies needed for storing it...
I am not calling you a liar, I believe that you tried a 5' hose, I would have to honestly say that I agree with others who said that you probably just have not been properly trained so that you feel comfortable with it.
My drill on a safety stop is simply to hand my wife the hose that is attached to my D-ring. It is so simple, it hardly requires a drill. It's on my chest, it's in my hand, it's given to her. No ducking head, not switching to octo, nothing. If I'm in trim, it's as simple as one arm movement forward. It is simple, straight forward, very easy.
I don't restow it when I'm done, usually. But if I wanted to I could either put it in my belt, (like a DIR diver without a cannister light often does) or restow it on the tank, (although that is admittedly a little harder). Again, a 5 foot hose isn't very long on a big diver.
One last question, ignoring tech/cave diving; simply recreational diving here... what makes your idea better than what many of us are doing? (again not jumping ya, just trying to see the logic here)
My way, someone comes up looking like they need some gas
Step one: grab long hose at fitting on side of reg
Step two: duck head and extend right arm out
done The recipient is breathing, now unloop the hose from under the light or pull it out of the waist band
Your way.
Step one: grab reg
Step two: rip reg out of constraint
cant donate yet, hose is neatly tucked behind you somewhere and wont extend past your chest
Step three:switch reg to left hand
step four: reach back with right hand and grab bungeed hose
step five: pull out long hose
step six: switch reg back to right hand and extend arm
ok if you first grab the reg across your body with your left hand and donate with your left hand you can cut it down to 4 steps. Honestly I don't see how this is better?