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Author Topic: A (subjective) guide buying your 1st Reg  (Read 12282 times)

antacid

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Re: A (subjective) guide buying your 1st Reg
« Reply #20 on: 17 Nov 11, 22:33 »
can lah. just dive at rayner's rock at 9 am... i bring you to this spot where the currents meet. that's where i bring divers i don't like for some morning exercise. great way to start the day!

Alvin Ho

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Re: A (subjective) guide buying your 1st Reg
« Reply #21 on: 17 Nov 11, 23:01 »
well instead of subjective there are objective tests of regs out there. ScubaLab for Scuba Diving magazine in the US usually have a annual comparison of regs. Good to have a look there.

http://www.scubadiving.com/gear/regulators/dive-gear-essentials-scuba-regulators

http://www.scubadiving.com/gear/regulators/scubalab-regulator-tests-2011

http://www.scubadiving.com/gear/regulators/scubalab-regulators

http://www.scubadiving.com/gear/regulators/scubalab-top-regulators-2009

Happy reading.... Lotsa information available there.  ;)
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quacker

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Re: A (subjective) guide buying your 1st Reg
« Reply #22 on: 18 Nov 11, 10:29 »
well instead of subjective there are objective tests of regs out there. ScubaLab for Scuba Diving magazine in the US usually have a annual comparison of regs. Good to have a look there.

http://www.scubadiving.com/gear/regulators/dive-gear-essentials-scuba-regulators

http://www.scubadiving.com/gear/regulators/scubalab-regulator-tests-2011

http://www.scubadiving.com/gear/regulators/scubalab-regulators

http://www.scubadiving.com/gear/regulators/scubalab-top-regulators-2009

Happy reading.... Lotsa information available there.  ;)

Nice one Alvin. Good job!!!
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Alvin Ho

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Re: A (subjective) guide buying your 1st Reg
« Reply #23 on: 18 Nov 11, 10:58 »
Nice one Alvin. Good job!!!

No worries i've been reading their articles for years. They used to have objective tests for fins as well. Thrust, speed through slalom course etc. Reading those articles changed my mind towards full foot fins and now i have 3 pairs.  :P
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tabi-bito

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Re: A (subjective) guide buying your 1st Reg
« Reply #24 on: 18 Nov 11, 11:36 »
Now.... How does one go about deciding on regs for technical diving?

And what are your thoughts about over balanced first stages?

livinouttabox

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Re: A (subjective) guide buying your 1st Reg
« Reply #25 on: 18 Nov 11, 14:01 »
Maybe someone can explain the mechanisms of overbalanced. From my limited understanding overbalancing is a way of compensating for the higher resistance experienced at breathing at depth. This is a result of change in density of air, as you go deeper simple physics dictate that the water pressure will "squeeze" the air molecules so hence the increase in air density. So somehow you have to make sure you regulate to maintain the constant air flow to the diver. Scubapro does so by using a larger "hole" (port) to allow more gas to flow through at any one point. Other brands does so by creating an Inter stage difference (between 1st stage and 2nd stage) to up the pressure at 1st stage before delivery to 2nd Stage, in other words, the intermediate pressure at the 1st stage is upped to "complement" the surrounding increase in (ambient) water pressure at depth.

The primary problem is tendency to free flow of the 2nd stage at depth because of the differing pressures held between stages. This pressure differential means that overbalanced 1st stages are not as compatible with other brand's 2nd stages and cannot mix and match as flexibly like say, a balanced conshelf 1st with an unbalanced Sherwood Brut 2nd stage.

The technology further helps if you're diving in colder waters and deeper too as an increase flow rate at the 1st stage might potentially cause a freeze up. Again, at recreational tropics limits, it has negligible differences since we scarcely go deep enough.

More if you're interested:
http://www.scubaboard.com/forums/regulators/115488-overbalance-reg-hype.html

http://www.scubaboard.com/forums/basic-scuba-discussions/31576-over-balanced-apeks-first-stage.html

http://blog.simplyscuba.com/index.php/2011/05/what-is-an-overbalanced-regulator/

I have a question now, difference between balanced and OVERbalanced then? Seems like both somehow correct for ip internally but mechanisms different is it?
« Last Edit: 18 Nov 11, 14:10 by livinouttabox »
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livinouttabox

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Re: A (subjective) guide buying your 1st Reg
« Reply #26 on: 18 Nov 11, 14:04 »
Never mind I think I've found my answer,

Unbalanced = Decrease in intermediate 1st stage pressure as tank pressure drops (ie. volume of air in tank decreases, lesser air is "drawn" with each constant breath)

Balanced = maintains in intermediate pressure as tank pressure drops. (ie. lesser air in tank so regulate maintains)

Overbalanced = Increase in intermediate pressure as ambient water pressure increases. (ie air density increases from "squeeze", iP goes up at 1st stage)

Gurus correct accordingly please.

http://blog.simplyscuba.com/index.php/2011/05/should-i-dive-with-an-unbalanced-regulator/
« Last Edit: 18 Nov 11, 14:11 by livinouttabox »
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tabi-bito

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Re: A (subjective) guide buying your 1st Reg
« Reply #27 on: 18 Nov 11, 15:07 »
Ah~~

Thanks for the summing things up, LOB ^_^ Does help sort things out a bit.... Guess the overbalanced regs would only make a real difference when diving beyond rec depths and/or extremely cold conditions....

antacid

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Re: A (subjective) guide buying your 1st Reg
« Reply #28 on: 18 Nov 11, 18:04 »
overbalanced regs would be what i consider as an additional feature that we won't need for recreational diving...

trapmonkey

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Re: A (subjective) guide buying your 1st Reg
« Reply #29 on: 23 Nov 11, 15:10 »
Jas, Alvin and SSG cognoscenti et al,

my take is from a purely consumers point of view.

A regulator lasts 1-2 decades, if serviced correctly and maintained.

my early diving was done on the US divers conshelf series and a set of 80s dacor regs that really made you feel like Jacques Cousteau(read lotsa chrome). I upgraded to balanced and diaphragm designs from apeks after 5-7 years. I bought my first set of basic apeks regs for about $750 all in. They still function fine and have been excellent throughout their service life.

I am about to upgrade my regs. Why because in simple singlish "my backside itchy".

I think we buy regs to be in control and personally be assured that the equipment we use as life support is treated with respect and maintained as such.

Regulator performance is better than its ever been, but you guys and gals are right in one respect... differences in performance numbers have very little to do with real world reliability. However, they do have alot to do with comfort.

If anyone asked me how to go about buying regs, i would say look at what the people who dive regularly use. Try if you can...(some people will lend you a regulator for the weekend..I won't, but some will) make sure what you want is locally supported in parts and trained serviced people. Make sure the look suits you and the budget suits you. It is no point buying cheaper regs only to get rid of them in the future. Buy once...as good as you can bear, cos regs last a long long time.

from a self-confessed APEKS geek,

happy and safe diving, Guy.

ps I have been diving since 1992 and frankly if you buy any apeks, aqualung or scubapro reg, you'll probably be fine. not to say that other brands aren't good.