Quote: (Originally Posted by tomhanaway)
I was having the same difficulty during my pool tryouts. Too many people waiting to try it out to explore the situation further at that time.
Exactly the reason I keep refusing to hold pool trial.
If someone never dive a CCR before and the unit isn't set-up perfectly, plus if the diver isn't explained very well what to expect as far as the breathing style changes before the trial (i.e. gas is forced on OC and drawn on CC), it is very likely that the wrong opinion will be formed.
On one of the KISS courses, I had someone took a while (~30 mins) to get used to the breathing characteristics of the CCR unit before he is comfortable. On other courses, people jumped in and be perfectly happy on the first breath.
So I make sure that the diver knows
EXACTLY what to expect from the first breath. And the unit is set-up to match his/her lung volume as close as possible.
On the SK, since there is almost no flow restriction on the loop, it is easy to start the breathing sequence wrong and "hate the WOB" if you don't know why you can't breath out fully yet activate the ADV on an in-breath and the baffle was set to match your lung perfectly beforehand as well. That's why you need to dive the unit you will be teaching to recognize this little problem...
