Interesting approach to automatic Buoyancy at DEMA

[KenE]

The problem I find if the battery dies/floods there is no way to add water/reduce bouyancy. This is an issue if you are wetsuit diving in cold water. I have to reduce bouyancy during ascent and failure to do so would cause an uncontrolled ascent and this is not advisable from 110'. So, to me a battery failure is a death trap.

 

[scubadada]

The problem I find if the battery dies/floods there is no way to add water/reduce bouyancy. This is an issue if you are wetsuit diving in cold water. I have to reduce bouyancy during ascent and failure to do so would cause an uncontrolled ascent and this is not advisable from 110'. So, to me a battery failure is a death trap.

The way I see it is that you start out as neutrally buoyant. It the battery fails, you can swim up at a leisurely rate, probably hold your safety stop and then vent the water and make your final ascent. This is nothing like an uncontrolled ascent. Take a look at the information that is available in the public domain, you would understand this.

 

[azstinger11]

The way I see it is that you start out as neutrally buoyant. It the battery fails, you can swim up at a leisurely rate, probably hold your safety stop and then vent the water and make your final ascent. This is nothing like an uncontrolled ascent. Take a look at the information that is available in the public domain, you would understand this.

James in his video mentioned he was only running the pump twice on a dive, once for initial descent and then once again at the 2/3 tank mark to compensate for the last gas. He also commented on making a 100ft to safety stop ascent and being neutral throughout with no input to the system. I would be curious to see if the unit ever does become mildly positive near the extremes (say sub 300 PSI). Again I think it's worth a try, not sure its the future, but always up to try something new and potentially fun.

One of the inventors is discussing rapid ascent prevention here.

 

[L13]

I think the pump might run a little automatically, probably to compensate for air consumed, because he mentioned that they use a ScubaPro computer as a controller.

Then again, I could be wrong. But there is no question that there are buoyancy changes from suit compression and gas consumption that happen during the dive that need to be compensated some how, otherwise you will be positively buoyant on ascent to your SS, and after consuming air. But the first is small and the second is slow and small.

 

[azstinger11]

I think the pump might run a little automatically, probably to compensate for air consumed, because he mentioned that they use a ScubaPro computer as a controller.

Then again, I could be wrong. But there is no question that there are buoyancy changes from suit compression and gas consumption that happen during the dive that need to be compensated some how, otherwise you will be positively buoyant on ascent to your SS, and after consuming air. But the first is small and the second is slow and small.

From the previous demo videos, its a pure manually operated system. Button on one side triggers the pump, and then manual vent knob. How they are dealing with the suit compression/air displacement changes dunno.

 

[L13]

From the previous demo videos, its a pure manually operated system. Button on one side triggers the pump, and then manual vent knob. How they are dealing with the suit compression/air displacement changes dunno.

Air consumption buoyancy change is so slow that that it wouldn't be much of an emergency issue. I'm more concerned about a dive to 120ft in a 7mm suit. It would be hard not to have an uncontrolled ascent if the pump failed.

Warm water, single tank recreational diving would work well though.

 

[azstinger11]

Air consumption buoyancy change is so slow that that it wouldn't be much of an emergency issue. I'm more concerned about a dive to 120ft in a 7mm suit. It would be hard not to have an uncontrolled ascent if the pump failed.

Warm water, single tank recreational diving would work well though.

Well if they ever come out to the west coast i'll volunteer as tribute and see how it goes (when I have an anchor line I can grab/clip a jon line onto). I'm not a complete idiot.... only mostly lol

 

[Wibble]

From the previous demo videos, its a pure manually operated system. Button on one side triggers the pump, and then manual vent knob.

Does it work just like one of those i3 BCDs? Or a normal BCD?

An up button and a down button.

 

[tridacna]

Does it work just like one of those i3 BCDs? Or a normal BCD?

An up button and a down button.

No. You add enough air to achieve neutral buoyancy then you’re done. It’s a constant volume concept. Water pressure can’t affect the buoyancy except for minor changes in neoprene crush.

 

[Wibble]

No. You add enough air to achieve neutral buoyancy then you’re done. It’s a constant volume concept. Water pressure can’t affect the buoyancy except for minor changes in neoprene crush.

Nor gas weight changes