http://www.scubaboard.com/forums/ad...nk-valve-feathering-modulation-technique.html... search for that thread and we would all know the real truth.
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http://www.scubaboard.com/forums/ad...nk-valve-feathering-modulation-technique.html... search for that thread and we would all know the real truth.
I think the reason was that this is not part of any current teachings. And hence deemed dangerous.
Just because it has been written out of the curriculum doesn't make it dangerous. Teaching people to scuba dive used to be about teaching how to deal with problems underwater and be totally comfortable with themselves and their gear. I say it's much more dangerous to be handing out C-cards to people who are still terrified of diving and unsure how to do anything but sit on the bottom of a pool and breath.
Impossible because of the crimping effect of the connection points in the 2nd stage itself. The air would have to somehow pass through those restrictions into your mouth while maintaining a (dangerous) overpressure. The reasons for this are complicated but vortices are induced where airflow is constricted at each point where the LP valve, hose, demand valve and finally into the purge or mouthpiece.
So no it can't blow up in your mouth and a total failure would just result in freeflow.
I might just have my "stupid" hat on, but that made no sense to me. Could you try explaining that in English?
Just because it has been written out of the curriculum doesn't make it dangerous. Teaching people to scuba dive used to be about teaching how to deal with problems underwater and be totally comfortable with themselves and their gear. I say it's much more dangerous to be handing out C-cards to people who are still terrified of diving and unsure how to do anything but sit on the bottom of a pool and breath.