Really stupid question... Why dive thirds with doubles?

[PfcAJ]

lol, sure. I'm confident that in 20 years, I'll add stuff to my equipment list because then I'll be a new cave diver that thinks that throwing equipment at the "issue" will solve it.

You've got one bottle with one reg on it for two people... I'd take less objection to this if both divers had the same stuff, but they don't. No cave agency teaches this, and there is a reason: its pointless.


Come chat with me when you have the cave experience that I do (which is what counts here). You still have issues unclipping spg's and not creating silt outs. Take a seat.

 

[DA Aquamaster]

Why not put that gas on your back so you have it when you really need it instead of on the line waiting to get stolen or messed with?

You are partially missing the point. If you are diving to thirds on back gas in a low flow cave already, the option is to increase the reserve with a stage, or to design your own custom larger-than-life tanks.

Now, as the dives get longer and become true stage dives, I agree with you completely, I'll breathe the stage and keep the larger reserve in the back gas.

 

[LiteHedded]

There you go with the assumptions and implications again. It's not rocket science, the extra gas just gives you more options and options are not a bad thing. I'd argue that training and protocol should open doors, not close them in regard to options.

I have the advantage in that I know what its like to be 20 something but, assuming you are not in fact a 40 something year old PFC, you have no idea what it is like to be 40 something. Let's revisit the issue in 20 years when you've basically doubled your adult experience.

no but he has done a cave dive or two. i wouldn't dismiss his points because you're older than him.

 

[PfcAJ]

A better way to increase BOTH divers safety by providing more gas without the added drag of a pony bottle is to shave a mere 200psi off your backgas turn pressure (in 104s, for this example).

That gives each diver 600 additional psi at the end of the dive. Thats roughly 48 cubic feet each, for a total of nearly 96cuft. Its in a format that can be used independently or shared.

Just 200psi off your turn pressure...

 

[DA Aquamaster]

You still have issues unclipping spg's and not creating silt outs. Take a seat.

That BS does not even warrant further comment.

I love the way you are so open to discussion of a topic - as long as everyone agrees with you.

no but he has done a cave dive or two. i wouldn't dismiss his points because you're older than him.

I'm not dismissing what he has to say, but I think age does come into play in terms of the trade offs and approaches people may take to diving and how they choose their priorities. It's no different than other developmental aspects of life.

 

[DA Aquamaster]

A better way to increase BOTH divers safety by providing more gas without the added drag of a pony bottle is to shave a mere 200psi off your backgas turn pressure (in 104s, for this example).

That gives each diver 600 additional psi at the end of the dive. Thats roughly 48 cubic feet each, for a total of nearly 96cuft. Its in a format that can be used independently or shared.

Just 200psi off your turn pressure...

I agree. If you've read other posts you will have noted I suggested exactly that for both back gas and side mount diving. It's not news, but it also does not fully equate to the additional gas of a third divers in the event of catastrophic gas loss.

On the other hand, the cost of carrying a stage on an entire dive in a no flow cave is about 200 psi, so the cost in terms of pentration is less and the gas reserve available to either diver is greater with no need to share gas on exit.


,

 

[MXGratefulDiver]

Besides, you never know when some moron with a scooter deeper in the cave, an Intro class doing a lights out exit, etc, etc, etc, will blow the viz and slow the exit.

... you mean like what happened at Orange Grove and Madison the week we were there?

:shocked2:

... Bob (Grateful Diver)

 

[ucfdiver]

... you mean like what happened at Orange Grove and Madison the week we were there?

:shocked2:

... Bob (Grateful Diver)

Even if someone did sneak one in, I wouldn't mention or complain about scooters in Madison or Peacock unless you NEVER want to be able to use them there....there's lots of amazing cave in Madison that the operating hours and DPV rule will prevent most of us from ever seeing, and it would just be plain fun to scooter the Pothole Tunnel in Peacock (not to mention time saving-- you could see 2-3 places a day compared to taking 2 hours to swim there now.).

 

[PfcAJ]

It's not news, but it also does not fully equate to the additional gas of a third divers in the event of catastrophic gas loss.


,

Neither does an al80 or a steel 72...

 

[DA Aquamaster]

Neither does an al80 or a steel 72...

I'll give you that - 77 cu ft is only 1/3 of 230 cu ft, not 260.