Scubapro naming convention?

[rsingler]

Sherwood may have had great ideas and dreams of ideal firs stages but execution always sucked. SP and Atomic rule indeed.

Tell us how you really feel, Burhan!
I still like my SR-2. But yeah. I mostly dive Atomic and Poseidon. And D's.

I might turn into a fanboi for the Mk19...

 

[BoltSnap]

Tell us how you really feel, Burhan!

I got to get over my shyness and learn to express my opinions in the open I know.

 

[Angelo Farina]

I'm sorry, Angelo. I can't let this one go.
You just disproved your own statement with your parenthetical addition. There's nothing more fault tolerant than a downstream second stage. It doesn't fail shut. If your first stage has a high IP failure, your second is still breathable. Yet, you chose complexity for the improved performance of the BA.

Why do you think that converting a plain 109 to a BA increases complexity?
The number of parts remains the same. The BA poppet originally was in two parts, then in three parts, but the latest S-wing poppet is one piece...
And the balance chamber is placed where in the original one there was a low-friction plastic distancer.
The modification does not just make the reg slightly smoother, it also increases fault tolerance (as some IP fluctuations from 1st stage are compensated for) and the seat is lasting longer thanks to the smaller static load, due to the lighter spring.
So modifying the 109 makes it more fault tolerant and reliable, keeping the number of parts unchanged.
For years I did employ the BA mod on my primary, while leaving the secondary unmodified.
In the years I did see those secondaries having more problems and often having small hissing, while the BA-modified primary was always flawless.
As soon ad the single piece S-wing poppet was made available, I did modify also all my secondary ones, and since then I had no more hissing, even if jumping over the standard service intervals...

 

[halocline]

I've converted most of my 109s to balanced. I find they hold a tune longer because there's less wear on the seat in storage, so to me that makes them more reliable over the long run.

 

[lexvil]

Doesn’t your S wing have two o rings and a rivet seat? Doesn’t that make it 4 parts?

 

[Open Ocean Diver]

Interesting airplanes back in the day had less parts and weren't as safe as planes today. Planes today with their sophistication many more parts redundancy have never been safer.

 

[Angelo Farina]

Doesn’t your S wing have two o rings and a rivet seat? Doesn’t that make it 4 parts?

No rivet (that was the older model) and just one O-ring. The seat is simply inserted in the plastic body. Same as with the duro poppet for the unbalanced version...

 

[lexvil]

Interesting airplanes back in the day had less parts and weren't as safe as planes today. Planes today with their sophistication many more parts redundancy have never been safer.

So true, more parts doesn’t necessarily mean no gain from complexity, I’ll take (and have) a modern “plastic” second stage every time, it’s just easier to get better performance from them. That said a 109 is a great reg even in the original configuration and when upgraded to balanced it is better than plenty of “other” brands. For the first stage MK 17.

 

[lexvil]

No rivet (that was the older model) and just one O-ring. The seat is simply inserted in the plastic body. Same as with the duro poppet for the unbalanced version...

The seat is a rivet style, you may want to look at the S wing poppet again because they have two balance chamber o rings (don’t really know why they went to two since Zeagle and Atomic get along fine with one) the balanced is more complex but better.

 

[axxel57]

The seat is a rivet style, you may want to look at the S wing poppet again because they have two balance chamber o rings (don’t really know why they went to two since Zeagle and Atomic get along fine with one) the balanced is more complex but better.

The S-Wing poppet with the two o-rings came on the market in 1999. It was supposed to reduce the friction in the balance chamber by deepen one of the grooves. The second o-ring should trap the silicone between the o-rings, preventing the o-rings to dry out with use........