Deco bottles affecting trim

[Kevrumbo]

. . .
But at least for backmounted doubles, putting a "head weight" on is bizarre.

It is bizarre, but it's a last resort solution if you can't adjust the bands lower (i.e. raise the manifold mass higher on your back) on a rental twinset for whatever reason, in order to counter the lung's buoyancy -which can be as much as plus 5kg with a full inhalation.

I once had to have 2 kg in a weight pouch between my shoulder blades with a 1 kg Aluminum BP -which was uncomfortable as hell- renting a twinset of manifolded AL80's in the Philippines, to counter heavy jetfins & lung buoyancy in a 1.5mil skinsuit.

 

[divezonescuba]

Since you would be the first person on the planet intentionally putting lead up high behind your head, I think you need a GOOD instructor as soon as possible.

Your suggestion reminds me of a dive on in Hawaii a few years ago. The instructor / dive guide did not ask me anything about my physiology, dives, certification level, nor equipment. She told me that I needed to use 14 pounds because some other guy she pointed to needed 14 pounds.

My tec 40, 45, and 50 instructor is the Head of a GUE dive center and is well known throughout the world as a rigorous instructor. Since he is familiar with my physiology, gear configuration (plastic plate and al80s), and skill level, I will pass on your advice. Thanks anyway.

 

[PfcAJ]

Your suggestion reminds me of a dive on in Hawaii a few years ago. The instructor / dive guide did not ask me anything about my physiology, dives, certification level, nor equipment. She told me that I needed to use 14 pounds because some other guy she pointed to needed 14 pounds.

My tec 40, 45, and 50 instructor is the Head of a GUE dive center and is well known throughout the world as a rigorous instructor. Since he is familiar with my physiology, gear configuration (plastic plate and al80s), and skill level, I will pass on your advice. Thanks anyway.

I agree with rjack.

You’re being misguided.

 

[lv2dive]

I really have a hard time believing a GUE instructor would recommend a "back of the neck" weight solution - which is what I took away from your post. Although admittedly you did not say he was a GUE instructor himself, only that he is the head of a GUE dive center.

While I am curious as to your instructor's agency affiliation / qualifications (primarily bc of the way you represented them), I'm more interested in the exact recommendation/s you received from him. Is it possible there is a minor disconnect (misunderstanding of the recommendations)?

Your suggestion reminds me of a dive on in Hawaii a few years ago. The instructor / dive guide did not ask me anything about my physiology, dives, certification level, nor equipment. She told me that I needed to use 14 pounds because some other guy she pointed to needed 14 pounds.

My tec 40, 45, and 50 instructor is the Head of a GUE dive center and is well known throughout the world as a rigorous instructor. Since he is familiar with my physiology, gear configuration (plastic plate and al80s), and skill level, I will pass on your advice. Thanks anyway.

 

[wKkaY]

But at least for backmounted doubles, putting a "head weight" on is bizarre.

I've seen it happen before on some 232 bar alloy tanks (can't remember which make) that were extremely butt heavy.

 

[Beau640]

Yeah but he said he dives aluminum 80’s with a plastic plate. Those definitely get floaty butt when low. Unless his “physiology” is that of Johnny bravo, probably shouldn’t have a weight behind his head