DEMA 2021 Presentation on SIDE MOUNT by Ben Bos
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- Опубликовано: 30 ноя 2021
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Nice job Ben! Excited to try the new setup. When will OmniSwivel have this available as a "package"?
Ben, I usually have complete faith in your knowledge and advice but you confused me at around ~44mins when you referred to AL80s being lighter and better buoyancy behaved than STEEL tanks, which contradict everything I believe about my tanks. IMHO and experience my 12.2Lt steels hold ~1Lt more gas, weigh less, and stay more consistently buoyant as my gas depletes - so I do not own any AL tanks for this reason.
Q) Did you make a mistake please mate?
Nope no mistake. The gas weight obviously does not change :-) however steel cylinders are heavier under water. A single 12l steel cylinder weight about 2kg empty in fresh water. An al80 is slightly positive empty in fresh water. So when adding about 2-3kg of gas the al80 becomes only a little negative. The steel one just becomes really heavy.
And in our opinion you then loose a lot of the flexibility you have with AL cylinders. Like stikking one out in front or rotation of stages in caves.
You are right in saying the steels are lighter on land but because of the density of steel the external volume of the steel cylinder is smaller and therefore the steel cylinder is heavier under water.
This all results in a more manageable cylinder regardless of the pressure/gas content.
I hope this makes sense.
Maybe I’ll make another video on this to demonstrate/ilistrate this.
Again there is no right or wrong it just depend on your preference. We just think it gives you more flexibility. And yes you would need to add some “lead” to your total system but you can place this close to your center of mass.
@@benbos1925 is the principal basically the same as why we use aluminum stage/deco bottles, yet we put steel doubles on our backs? Thank you.
@@brois841 yes you are quite correct. However in back mount, we can't really move the tanks from our backs under normal circumstances. That's why we can kill two birds with one stone and use heavy cylinders and not as much lead.
And the reason some side mount divers choose to wear steel cylinders as their “back gas/bottom gas” is because they sit where they sit and are not as dynamic as alu cylinders. “Read: alu cylinders get lighter, especially in the rear”.
However this specific buoyancy characteristic is what we can use to our advantage, since we can easily move them around. And because now the cylinders are on either side of us, they steal some of the great freedom of lateral movement we enjoy in side mount diving.
@@benbos1925 thanks for the response, makes perfect sense. This is why here in Floris so many people use LP85's; they exhibit similar characteristics, carry more air and we can overfill them ("cave fill"). This isn't available in most places outside of FL, so standardizing on Aluminum 80's makes sense.
@@benbos1925 ahh OK then thanks for clarifying, dynamic characteristics of AL tanks is a 'feature' you prefer to exploit for side-mount. No use to me I'm a steels & drysuit kinda guy. Cheers buddy :)