quick questions is there a big differnece in 100 cu ft Al vs 80 Cu ft Al or 100 cu ft

[ukspice69]

quick questions is there a big differnece in 100 cu ft Al vs 80 Cu ft Al or 100 cu ft Steel , I am an air hog

 

[00wabbit]

I am an air hog too. In the cold quarry I get about 22 mins with an AL80. Surfacing with 500psi left. (Started with 3000)

Last time I went I rented HP100 tanks. Started with 3400 psi. My buddy was low on air at 24 mins so we surfaced. I still had 1200-1500 psi left on each of our 3 dives.

I will be renting the hp100's form now on.

 

[boulderjohn]

The difference should be able to figure out with pretty basic math. 100 cubic foot tanks filled to their capacity generally have 100 cubic feet in them. 80 cubic foot tanks generally filled to standard capacity have 77.4 cubic feet in them. (Off the top of my head, I am not sure if the AL 100 tank has less than its named capacity the way an 80 cubic foot tank does.) That amounts to nearly a 30 percent increase, so you should expect that much additional dive time.

 

[Superlyte27]

There is no good reason to buy an AL100. It weighs way more than an AL80. It's bigger in diameter. So, the added gas you gain by moving to an AL100 is diminished by the added diameter of the tank (more drag through the water) and the weight of the tank. It's a beast. An HP100 would be a better choice, albeit more expensive.

 

[boulderjohn]

There is no good reason to buy an AL100. It weighs way more than an AL80. It's bigger in diameter. So, the added gas you gain by moving to an AL100 is diminished by the added diameter of the tank (more drag through the water) and the weight of the tank. It's a beast. An HP100 would be a better choice, albeit more expensive.

I fully agree. An HP 100 is a very nice tank. Without even talking about its capacity, I would rather dive with an HP 100 than either an AL 80 or an AL 100, just for the feel of it.

 

[E8ArmyDiver]

First off,why are you an air hog?It has been my experience that air hogs are generally either not relaxed enough,over exerting during a dive,breathing WAY to shallow & fast or cold.Now many people think they are relaxed but,if you are even subconsciously apprehensive or worried(even if it's about the mortgage),you will experience muscle tension & heavier breathing.Also unless you are involved in a rescue or working project,when properly weighted with good buoyancy control,diving is effortless & if you focus a little attention on breathing deeply & slowly your air consumption will decrease.
With that said I just started diving 100cu.ft.HP Steel(Worthington)& will never go back to aluminum.The smaller physical size suits my 5'8" frame better & the weight characteristic has allowed me to drop 5 lbs.of lead from my gear.

 

[windapp]

The difference should be able to figure out with pretty basic math. 100 cubic foot tanks filled to their capacity generally have 100 cubic feet in them. 80 cubic foot tanks generally filled to standard capacity have 77.4 cubic feet in them. (Off the top of my head, I am not sure if the AL 100 tank has less than its named capacity the way an 80 cubic foot tank does.) That amounts to nearly a 30 percent increase, so you should expect that much additional dive time.

20/77.4 = 25.8 percent.

 

[boulderjohn]

20/77.4 = 25.8 percent.

Excellent arithmetic!

Try this one in comparison:

100 - 77.4 = 22.6.

22.6/77.4 = 29.2.

 

[DukeAMO]

Yeah, when we finally invest in tanks, I think it'll be either HP100s or HP85s (I'm only 5'6").

We tried AL100s a couple of weeks ago. It was nice having all of the extra air, especially on a relatively deep dive, but the tank was friggin huge. It was bumping into the backs of my knees, and I banged it on the side of the boat on the way in. I'm not a big fan of the 8" diameter either; my BCD's tank bands just barely fit around it, and you have to re-adjust them to go back and forth between the 8" and 7.25" tanks.

Anyone ever tried the "Neutral 80" tanks? XS Scuba Luxfer Aluminum Scuba Cylinder Specifications

 

[ukspice69]

so I am going with the 100 Al on the blackbeards trip , just what to hang with the rest of the crowd and dont force the dive early