First time diving doubles and sidemount.

[TSandM]

I've never noticed any difference in my SAC rate related to the tanks I dive. There's a difference between single tank and doubles, but not among the sizes of doubles, and I've dived everything from the little 72s to 130s. I think, if your trim is good in the tanks, the small difference in the width of your rig doesn't really affect much at all. On the other hand, some tanks don't trim out very well at all.

 

[Teller]

My SAC doesnt change with different tanks. Its the same unless the enviroment is different i.e. high flow cave vs no flow cave.

 

[SWAMPY459]

I've never noticed any difference in my SAC rate related to the tanks I dive. There's a difference between single tank and doubles, but not among the sizes of doubles, and I've dived everything from the little 72s to 130s. I think, if your trim is good in the tanks, the small difference in the width of your rig doesn't really affect much at all. On the other hand, some tanks don't trim out very well at all.

I have not actually run the numbers, but I really do believe my SAC rate got better when I started diving sidemount. I believe it is psychological. Knowing I have complete redundancy may just make me more relaxed and therefore less stressed ... maybe?

 

[Ironman]

Take a sidemount course from Edd sorrenson in Mariana FL if you wanna dive sidemount. If you wanna dive side sling.... then take a padi sidemount course.

Yep, here we have another of those highly informed and obviously objective comments from a very experienced diver, whose training background gives him first hand insight into what he is talking about.