Larger cylinder for nitrox?

[RIOceanographer]

The Lovely Young Kat claims that Nitrox does all these good things for her and she can tell. I, on the other hand, can't feel any difference between diving Nitrox and diving air.
Kat sez I'm just a typical insensitive man
Rick

I'm with Rick. I never noticed any difference in how I felt. But then, I feel fine diving on air so I am not sure how I'd feel better.

 

[Jim Lapenta]

Real or not when doing 4-6 dives a day with students nitrox seems to leave me less tired. Doing recreational stuff for fun does not seem to make a difference. I don't mind going into a little deco as well if needed. For deep stuff and longer times a little helium is very nice.

 

[Damselfish]

By all means take the Nitrox class. Then decide if using Nitrox makes sense for the dives you're doing. If you are doing repetitive dives you may find Nitrox benefits you even with your current size tank. But, you don't have to use Nitrox just because your computer is capable, you may decide for your typical day of diving it's not worth what you'd get. Nitrox fills do cost more. (Tank size may or may not affect the price - depends on how big and where you go.)

 

[The Kraken]

The HP 119's and 130's make for nice extended bottom time tanks. Negatively buoyant and compact, other than having an 8" O.D.

Seems that many, many shops gloss over the fact that after taking the nitrox course you probably won't get more bottom time because wherever you go, you're still going to be diving an aluminum 80 and using the same volume of gas. I think many new divers considering taking a nitrox course are under the false concept that nitrox reduces the volume of gas consumed during the dive, and most shops seem not to want to disspell them of that concept.

You so quickly recognized that, yes, you can extend the amount of bottom time that you can possibly dive, but that it's the volume of your tank that is the controling part of the equation.

I think most people are more concerned about getting more bottom time than they are about reduced surface interval times.

Two dives of 30 minutes each still, and forever will, total only 1 hour bottom time. Doesn't make a hill of beans as to how quickly you got to do that second dive.

the K

 

[Rick Murchison]

The HP 119's and 130's make for nice extended bottom time tanks. Negatively buoyant and compact, other than having an 8" O.D.

Seems that many, many shops gloss over the fact that after taking the nitrox course you probably won't get more bottom time because wherever you go, you're still going to be diving an aluminum 80 and using the same volume of gas. I think many new divers considering taking a nitrox course are under the false concept that nitrox reduces the volume of gas consumed during the dive, and most shops seem not to want to disspell them of that concept.

You so quickly recognized that, yes, you can extend the amount of bottom time that you can possibly dive, but that it's the volume of your tank that is the controling part of the equation.

I think most people are more concerned about getting more bottom time than they are about reduced surface interval times.

Two dives of 30 minutes each still, and forever will, total only 1 hour bottom time. Doesn't make a hill of beans as to how quickly you got to do that second dive.

the K

Yes, yes... if you're diving "two tank dives" off commercial boats then a larger tank is definitely worth the investment. If you have some flexibility in when and how often you can get in the water then the shorter SI/more dives method may be the way to go.
When I'm diving with PCDC out of Panama City I take my big tanks. When I'm in Bonaire I make more dives.
Depends...
Rick

 

[wilksoner]

of course u should take a nitrox course repetitive dives thats y

 

[Green_Manelishi]

I am not suggesting you do so but you can learn what you need without taking the course but you probably won't be able to get a fill.

Pushing NDLs is no reason for using anything different; remember that you are not a model you are a human "bean" and your reaction to increased PO2 and/or increased absorbtion of N will be different from mine and will most certainly be different day to day.

Understand the issues, weigh the risk(s) against the gain(s) and make an informed decision.