Are HP tanks what I need?

[idive2]

That's the HP 65, now that's weird little item.

I saw a couple of these at the dive shop a few weeks back and had to ask what they were !

 

[uncfnp]

Thanks again to everyone that posted with suggestions. I went with a pair of HP 80's from my LDS. Didn't get to dive with them but the length is a perfect fit. Next dive will be Blue Heron Bridge in May to adjust weight and trim...

Lisa

 

[uncfnp]

Reading up on end dive buoyancy with aluminum vs steel, looks like I need to drop about 4 to 6 pounds making the switch to HP 80's. Does that sound about right?

 

[lowviz]

http://www.scubaboard.com/forums/norcal/440724-what-tanks-should-i-get-3.html#post6568184

 

[spectrum]

If they are X series it may be closer to 7 pounds! The specific Aluminum cylinder could also vary a little. I'd start by dropping 4 and have some 1 or 2 pounders accessible for an end of dive weight check.
As mentioned, an AL-80 has 4.4 pounds of positive buoyancy when empty.
Meanwhile a X-80 Cylinder will be 3 pounds negative when empty. 4.4+3 = 7.3
pounds of difference in buoyancy. The aluminum tank is a liability since you
need to add weight to hold it down at the end of the dive. The steel tank
contributes to keeping you and your exposure suit down. The 7.3 pounds
represents 7.3 pounds of weight you do not need to wear when diving a X-80. This
comes right off your belt. Reference