Position & breathing issue

[Nemrod]

""The human body has no means of sensing or feeling differential pressure in the lungs. The muscles surrounding the thoracic cavity (around the lungs) do the work of breathing, but pressure differential is sensed in the inner ear.""

At first I did not understand the explanation given by Nemrod, thinking that such a small difference in height could not possibly affect WOB. The work of breathing has nothing to do with the inner ear, by the way. The cracking pressure of most regs is set to about 1 inch of water. Having said that it makes perfect sense that lying on your back the height of the water column between the diaphragm of the 2nd stage, and the center of the lung is maybe 3 or 4 inches, thereby quadrupling the the cracking pressure. This also explains why regs breath easier under water swimming face down than on the surface. I suspect there is no way around this, with common single hose regs.

The inner ear theory is not my theory.

A reg set at a one inch equivalent (of water column) would be a stiff breather IMO, I try to get down in the .5 inch range.

N

 

[Slonda828]

That can be easily arranged. There is a growing number of double hose divers all around with a few near your location. If you are ever in the North East, you are welcome to try one of mine.

If you are ever in Georgia, you can meet up with me a dive a double hose as well. I work for a LDS, so you can use the pool or we can dive open water. Vintage divers share their gear.

 

[herman]

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I made only a few non-certfied dives in 1971 with a two-hose reg. I remember being horizontal and on my back and feeling the reg trying to pressure-breathe for me. That was kinda cool. I'd love to dive a two-hoser again, now that I'm certified.

I would be happy to meet you at Rolesville quarry (north of Raleigh) or Lake Rawlings once the water warms up some or if you are in the Raleigh area sometime I usually can get access to a heated pool. I have an assortment of DH regs you are welcome to try.