My "new" independent doubles setup

[AfterDark]

Very nice, that beats the IP performance of every SP piston first stage I have owned.

One of the many reasons I can't stop using them! They preform better than anything I could imagine or expect. My DBL hose preforms very well and I enjoy using it but I do miss my SP setup when I do.

 

[Open Ocean Diver]

If I'm reading that right, no inline shutoff is showing 17 SCFM, and with shows 15 SCFM.
If I'm an airhog and using 1 CFM RMI, I can assume that I'm only inhaling half of the cycle, and call it 2 CFM flow on inhale at surface. So I would have to be at 7.5 ATM or greater than 200 ft to reach the with switch CFM limit.
That, and nice PJs!

Respectfully,

James

25 delta 23 SCFM I’m guessing from your calculation not a significant restriction.

 

[James79]

25 delta 23 SCFM I’m guessing from your calculation not a significant restriction.

Cool, I was looking at the bottom of the "pointer" rather than the top.

And yeah, I think AD will survive with the inlines. I think. Maybe he's an unrecognized hero of air hogs, capable of sucking down an AL80 in 3 minutes. lol.

Best,

James

 

[Gone for diving]

If you put a gauge in your bcd connector and breath on your reg. There is a pressure drop in IP pressure... I am sure some regs fluctuate more than others...
But I have seen 10psi drop on a large inhale on the bench...
So I can't see a huge problem if input pressure is within a few psi... plus. If you tilt you body while diving... the pressure will change on each reg...
Tanks 12inchs apart would be a difference of .433 psi fresh water...
I know its minor.... but something to think about.
Also what I never hear discussed is that the hoses are a reservoir...
it acts like a pressure tank in a house water system.
A 7ft hose has way more cu ft of 130psi of air stored in it, than a 24inch hose.
That is why you do not have performance loss on a 7 ft hose... (nobody can inhale continuously.... and the first stage has time to catch up in between)

 

[Angelo Farina]

If I'm reading that right, no inline shutoff is showing 17 SCFM, and with shows 15 SCFM.
If I'm an airhog and using 1 CFM RMI, I can assume that I'm only inhaling half of the cycle, and call it 2 CFM flow on inhale at surface. So I would have to be at 7.5 ATM or greater than 200 ft to reach the with switch CFM limit.
That, and nice PJs!

Respectfully,

James

Which corresponds to what my friend Marco experienced when diving below 60m in air with the Pilot, in the seventies.
However the max flow rate was significantly improved with the latest version of the MK5, to the point that, after purchasing one of these first stages, he did not feel anymore the need of using two first stages and two hoses for feeding his Pilot.

 

[Open Ocean Diver]

Found this. Seems Pilot was designed to have double hoses connected.

 

[AfterDark]

Found this. Seems Pilot was designed to have double hoses connected.

View attachment 675759

The A.I.R. 1 is also that's why I'm using it for this project. Did you think its use was an accident?

 

[Open Ocean Diver]

The A.I.R. 1 is also that's why I'm using it for this project. Did you think its use was an accident?

No I just figured it was brilliant, I came across this because I’ve been looking at purchasing a pilot.

 

[AfterDark]

No I just figured it was brilliant, I came across this because I’ve been looking at purchasing a pilot.

Scubapro with the old crew were brilliant innovators. I shudder to think what we would have for regulators today if not for them. Like nuclear subs without Rickover.

 

[James79]

I shudder to think what we would have for regulators today if not for them

We'd have more Aqualung! I still like the Conshelf (the old chrome ones).