Gerbs
Contributor
From my reading, the position of the opponents of primary donate are:
1. Donating the regulator that I breathe out of, then trying my secondary regulator and going to buddy breathing if it should fail in a non-fixable manner is dangerous.
However, donating the regulator that I breathe out of, ignoring my secondary regulator and going straight to buddy breathing is safe and a required skill called buddy breathing.
2. Because divers are prone to panic under OOA, you, as the donor, need to stay on your regulator to avoid endangering yourself.
However, because divers are well trained, and not prone to panic, they will retrieve a regulator that is strapped on to the point of being needed to be cut loose, lost behind the donating diver and/or attached somewhere hidden and obscure on the diver near the chest area. Also, a malfunctioning regulator for the recipient is not a problem, as the donor is not panicking and is able to initiate buddy breathing by donating their primary regulator.
3. Because under stress a donor cannot depend on thought, the hose must be stowed so as to deploy automatically, so nodding your head to deploy the hose is not something that can be expected of people.
However, because donors and recipients are not under stress during OOA, a bungeed knot of hose next to the tank to be untangled isn't an issue.
Have I missed any?
I'll concede that primary donation for independent doubles with a long hose is a different issue, same if you are on a rebreather. For a professional rescuer, a spare breathing apparatus (tested and maintained for just this purpose) is the sensible recourse. Twin hose regulators are a special case as well.
I've yet to see any arguments that would convince me that for a diver diving as part of a buddy team/group using single-hose OC gear with either back mounted single or double tanks a primary donate / "Hog Wrapped" long hose primary solution is not either a safe viable alternative or even the preferential solution.
Gerbs
ps. The Association of German Sports Divers (VDST) has, related to my by 3rd party as anecdotal evidence, found that in semi-realistic conditions (pair of higher certification aspirants, one gets told to fall behind and remove their reg, told to wait for 15~20 seconds or until the other diver realises what happens, then goes for air from the diver that has swum ahead) divers trained in (secondary) regulator receive tend to revert to primary take with increasing probability as time without gas is extended. Oh, 60 seconds breathhold and 60m distance on breathold is a prerequisite for this certification.
1. Donating the regulator that I breathe out of, then trying my secondary regulator and going to buddy breathing if it should fail in a non-fixable manner is dangerous.
However, donating the regulator that I breathe out of, ignoring my secondary regulator and going straight to buddy breathing is safe and a required skill called buddy breathing.
2. Because divers are prone to panic under OOA, you, as the donor, need to stay on your regulator to avoid endangering yourself.
However, because divers are well trained, and not prone to panic, they will retrieve a regulator that is strapped on to the point of being needed to be cut loose, lost behind the donating diver and/or attached somewhere hidden and obscure on the diver near the chest area. Also, a malfunctioning regulator for the recipient is not a problem, as the donor is not panicking and is able to initiate buddy breathing by donating their primary regulator.
3. Because under stress a donor cannot depend on thought, the hose must be stowed so as to deploy automatically, so nodding your head to deploy the hose is not something that can be expected of people.
However, because donors and recipients are not under stress during OOA, a bungeed knot of hose next to the tank to be untangled isn't an issue.
Have I missed any?
I'll concede that primary donation for independent doubles with a long hose is a different issue, same if you are on a rebreather. For a professional rescuer, a spare breathing apparatus (tested and maintained for just this purpose) is the sensible recourse. Twin hose regulators are a special case as well.
I've yet to see any arguments that would convince me that for a diver diving as part of a buddy team/group using single-hose OC gear with either back mounted single or double tanks a primary donate / "Hog Wrapped" long hose primary solution is not either a safe viable alternative or even the preferential solution.
Gerbs
ps. The Association of German Sports Divers (VDST) has, related to my by 3rd party as anecdotal evidence, found that in semi-realistic conditions (pair of higher certification aspirants, one gets told to fall behind and remove their reg, told to wait for 15~20 seconds or until the other diver realises what happens, then goes for air from the diver that has swum ahead) divers trained in (secondary) regulator receive tend to revert to primary take with increasing probability as time without gas is extended. Oh, 60 seconds breathhold and 60m distance on breathold is a prerequisite for this certification.