How does exhalation works ?

[Externet]

Hi.
Not exactly s.c.u.b.a., but curious on how exhalation venting works for these helmets :
----> Poolscrubber
Please move if improper here.

And, does anyone has a used one of those 'Sloan7' for sale ? Or are they unobtanium ?

 

[tomfcrist]

You can see exhaust bubbles in one of the pics...my guess is that it would work like a really big FFM... But closer to a commercial rig than anything else.

 

[JohnN]

Hi.
Not exactly s.c.u.b.a., but curious on how exhalation venting works for these helmets :
----> Poolscrubber
Please move if improper here.

And, does anyone has a used one of those 'Sloan7' for sale ? Or are they unobtanium ?

I saw something like this when I was on Curacao last April. Really really really really s**ty idea to have people walking on the reef (or even on the sand leading up to the reef). These bozos were putting in at Go West, I now regret not making a huge stink about it to the operators.

 

[tbone1004]

I think they work like commercial diving helmets, continuous flow of gas into the helmet, no "regulators" per se, standard FFM's use a standard or slightly modified second stage depending on whether or not it has a continuous freeflow. Helmets are generally surface fed and there is no demand valve involved, so surface supplies a continuous flow of gas, very inefficient obviously, but you can breathe freely

 

[diversteve]

They just vent the air out the back near the bottom. The compressor forces air in and keeps the water out well below your head/nose level.

They use something similar at Coral World in St. Thomas. As you dive past them you can see the bubbles streaming out. Sea Trek »

There's also the SUB units used at Stuart Coves. Each one carries it's own tank and is self propelled. Stuart Cove's Sub Bahamas Adventure