need Nitrox 32 info...

[Charlie99]

4. do you understand that time turns a dive not gas.(with proper planning)

A properly planned dive will have ample gas to complete the planned dive time. Contingency planning is where you account for the unknown's that may lead you to increase you air consumption from your planned dive. (Hence, then turning on gas not time)

So according to you and Nova, a plan of drifting along until hitting a predetermined gas pressure, then doing a series of multilevels, deep stops, and safety stop, then ascending to be picked up by the boat is not an acceptable dive plan?

Please explain what the problem is.

 

[FIXXERVI6]

What StSomewhere said, first dive bottom time extension in my opinion is not worth the effort for nitrox if that was its only benefit, if your doing multiple dives a day the benefits will add up REAL quick and you won't feel as tired, I've pushed 4 dives a day on nitrox for two days back to back while everyone else was on air, I got far more bottom time in and I was perky while everyone else was complaining about being tired, nitrox is worth every penny.

 

[nova]

So according to you and Nova, a plan of drifting along until hitting a predetermined gas pressure, then doing a series of multilevels, deep stops, and safety stop, then ascending to be picked up by the boat is not an acceptable dive plan?

Please explain what the problem is.

If it's acceptable to you then have at it. when I plan dives I don't just drift along. I drift to a predetermined time and then I start my accent plan. that way I can track PO2, N2 onloading and offgassing, but hey , that's just me

 

[Jason B]

4. do you understand that time turns a dive not gas.(with proper planning)

Okay nova, you and I are going for a simple cave dive in Devils Ear and we both have a set of doubles. Mine are 95's pumped up to 3400 psi and yours are 104's pumped to 3300 psi. You are claiming that we turn this dive on time???

 

[Charlie99]

If it's acceptable to you then have at it. when I plan dives I don't just drift along. I drift to a predetermined time and then I start my accent plan. that way I can track PO2, N2 onloading and offgassing, but hey , that's just me

What makes you think I'm not tracking and planning max limits on PO2 and N2? Another typical example where gas consumption is the limiting factor is in a shallow dive.

Sometimes I change my plan during the dive, while taking into account N2 loading. For example, on a late afternoon shore dive in Cozumel, things were pretty interesting and so I decided to turn it into a night dive too. Sometime after 2 hours underwater I was running low on gas from my AL80 and decided to swim on back in. At 20' average depth, N2 wasn't a problem. Since my dinner reservations were for later that evening, time wasn't a problem.

"4. do you understand that time turns a dive not gas.(with proper planning)" is a ridiculous generalization, but if it's acceptable to you, then have at it.

 

[Tom Yerian]

My friend, I think you meant 80cft, and psig startsig stop:

Capt. Tom

 

[nova]

Okay nova, you and I are going for a simple cave dive in Devils Ear and we both have a set of doubles. Mine are 95's pumped up to 3400 psi and yours are 104's pumped to 3300 psi. You are claiming that we turn this dive on time???

OK jasoB, we've both been to the ear . So we both know that it's easy to get into deco in the ear. So both of us can make , and defend , our points.

My point (devils ear) to divers with low sac rates and doubles need to turn the dive with a watch to avoid massive deco times.

your point (same system) a diver can stay shallow enough to turn a dive on thirds of the smallest volume tanks.


This is a good example of why divers need to know more than one way to plan a dive.


Now try this dive . wreck at 140fsw , both divers have the same doubles and one's filled with 26% O2 one has 28% O2. Are you going to turn this at thirds?

 

[nova]

What makes you think I'm not tracking and planning max limits on PO2 and N2? Another typical example where gas consumption is the limiting factor is in a shallow dive.

Sometimes I change my plan during the dive, while taking into account N2 loading. For example, on a late afternoon shore dive in Cozumel, things were pretty interesting and so I decided to turn it into a night dive too. Sometime after 2 hours underwater I was running low on gas from my AL80 and decided to swim on back in. At 20' average depth, N2 wasn't a problem. Since my dinner reservations were for later that evening, time wasn't a problem.

"4. do you understand that time turns a dive not gas.(with proper planning)" is a ridiculous generalization, but if it's acceptable to you, then have at it.

your absolutely right Charlie, if you don't go any deeper than 25 fsw than feel free to burn a tank to zero. But since this thread was in the tech section I though it deserved a technical answer. Feel free to take a 130 cuft tank to 130fsw until you hit thirds or whatever rockbottom calcs you use, don't worry, you know what your doing. even though the science of diving has always used time and depth for calculating N2, you still have gas left so all those scientist MUST be wrong

 

[cornfed]

You are claiming that we turn this dive on time???

Yes and no. There are two reasons to turn a dive, time or gas. Nova is claiming that time supersedes gas. In otherwords, if you reach your turn time before your turn pressure you still turn the dive.

 

[padiscubapro]

Yes and no. There are two reasons to turn a dive, time or gas. Nova is claiming that time supersedes gas. In otherwords, if you reach your turn time before your turn pressure you still turn the dive.

absolutely..