DIR Answer Required

[JeffG]

Ah..ok, so if I understand, you are talking logistic concerns.

Pretty much. There are some wierd sumps in the world that would not be doable in a DIR fashion...(and give me the heebie jeebies reading about). There might be some other dives that might not be doable DIR style, but I can't think of them off the top of my head.

 

[onfloat]

Sigh...long story. It involves a hero, GI3, ...a villain, AG, and a place, where only our hero can get to....Downtown. A part of a cave in Florida.

No mention of the toy scooter??

 

[JeffG]

No mention of the toy scooter??

Thats in chapter 2...along with being slick and doing tic tac toe deco.

 

[onfloat]

I can hardly wait!!

 

[lakewinni]

Your sac would only need to be about .3 with a 500 psi reserve.

70/33(depth divided by atms)=2.1212+1(plus one for air)=3.1212(total Pressure at 70 feet)*.3(SAC)=.9363(cft consumption per minute at 70 feet)*90(minutes)=84 Cubic feet

Since alum80s carry 77.whatever cft I think your a little bit short, with absolutely no reserve, which makes you a lot a bit short, and dead.

 

[onfloat]

70/33(depth divided by atms)=2.1212+1(plus one for air)=3.1212(total Pressure at 70 feet)*.3(SAC)=.9363(cft consumption per minute at 70 feet)*90(minutes)=84 Cubic feet

Since alum80s carry 77.whatever cft I think your a little bit short, with absolutely no reserve, which makes you a lot a bit short, and dead.

your right, my math was off, forgot to add 1 for the surface. That's what get for trying to make dinner and figure out a dive. I'm dead. Should have been a sac of .2

 

[onfloat]

Nor is doing a 130' dive on air in the first place.
Nor is counting on your SPG to be accurate down to 100psi.
Nor is doing a dive to 130' on an AL80 (though I don't think he specified the tank size?)
Nor is doing a 3 minute stop at ½ max depth and a 3 minute stop at 15 FSW with a 30fpm ascent rate
Nor is using the "NDL" on a computer as a basis for altering a dive plan

Yep, just figured I would go slow.

 

[Snowbear]

Yep, just figured I would go slow.

Hehe - slow ascents are definitely DIR... especially as you get shallower

 

[Cacia]

Nor is doing a 130' dive on air in the first place.
Nor is counting on your SPG to be accurate down to 100psi.
Nor is doing a dive to 130' on an AL80 (though I don't think he specified the tank size?)
Nor is doing a 3 minute stop at ½ max depth and a 3 minute stop at 15 FSW with a 30fpm ascent rate
Nor is using the "NDL" on a computer as a basis for altering a dive plan

What is the air limit? We would have to change a lot here. You are saying you need tri-mix to do The Sea Tiger? (127)

I would say roughly 40-50 divers a day (tourist divers) are doing that dive with AL 80 's every day here.

 

[onfloat]

What is the air limit? We would have to change a lot here. You are saying you need tri-mix to do The Sea Tiger? (127)

I would say roughly 40-50 divers a day (tourist divers) are doing that dive with AL 80 's every day here.

Air is less than optimal for anything but a shallow reef dive, preferred is Nitrox 32. Air definitely not below 100 ft. When I did the Sea Tiger my max depth was 106 ft. I just didn't go over the edge to the floor. So it's possible to do with out going to 127. (That max depth thing for the plan.)

For depths to 130 that's why we start looking at recreational triox, to start limiting the equivalent narcotic depth.

How many of those 40-50 divers are in over their head, literally, relying on the DM to get them back to the boat with 500 psi in there tank? why do they have to have 500 psi in their tank? A boat rule or is that what they need to get out alive? Maybe it's because 500 psi is 10% of a 5000 psi gauge, and a guage cannot be relied upon to be accurate at the upper and lower 10%. Maybe it's 350 maybe it's 650, who knows?