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Old 07-26-2018, 01:32 AM   #1 (permalink)
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R7 operating pressure + a couple Q's

1. Anyone have a guess as to what the operating pressure is on a Retro 7?

I'm curious how it relates to a regular CCI Phantom (typically ~ 800psi in the valve, right?).

Tangential, but related:
I remember hearing an expert (possibly from ADG) say they discovered that on any given marker, there is somewhere around 250 psi maximum behind a paintball when it's fired.

2. Anyone know who this would have been and
3. If I got the number correct?
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Old 07-26-2018, 01:51 AM   #2 (permalink)
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1. I haven't tested mine, but considering the fact that the R7 uses a phantom hammer, cupseal, powertube, etc, I would assume it's the same as a Phantom.

2. That was Tom Kaye, should still be hosted on AGD somewhere. That will be subjective to the gun though. I also question the accuracy of that test; my understanding is that he put a gauge in the breach and shot the gun. I don't think that would allow the gauge to fill to equalization.

3. I don't know, but it sounds right. I haven't read that test in years.
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Old 07-26-2018, 03:04 AM   #3 (permalink)
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To your point, Planet Eclipse is claiming an operating pressure of 105 psi on their current CS2 space gun spool valve.

(https://planeteclipse.com/marker/cs2/#goto-intro-tab)

That would suggest a lower psi requirement to move a paintball.
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Old 07-26-2018, 08:26 AM   #4 (permalink)
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To your point, Planet Eclipse is claiming an operating pressure of 105 psi on their current CS2 space gun spool valve.

(https://planeteclipse.com/marker/cs2/#goto-intro-tab)

That would suggest a lower psi requirement to move a paintball.
PGI Mayhem operated around that pressure I believe. Maybe the Nova and A80 as well.
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Old 07-26-2018, 08:49 AM   #5 (permalink)
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Originally Posted by magmoormaster View Post
2. That was Tom Kaye, should still be hosted on AGD somewhere. That will be subjective to the gun though. I also question the accuracy of that test; my understanding is that he put a gauge in the breach and shot the gun. I don't think that would allow the gauge to fill to equalization.
It was a high speed pressure sensor with a storage oscilloscope, so plenty fast. The pics of the posted graphs have been lost to the internet a few times, I think TK gave up reposting them.

Pressure behind the ball is different from pressure at the valve. For instance, the automag with HPA measures around 450psi at the dump chamber, but around 60 psi in the breech behind the ball (peak). Nelsons do not put 800psi on the ball. Valve/powertube arrangements cause flow restrictions while the ball moves with the expanding gas, resulting in the pressure drop from dump chamber to breech.

Also, CO2 has a slower expansion than air. As CO2 pressure gets down to about 300 psi, it acts more like air. I have not seen a curve for CO2 pressure behind the ball, but would expect that a properly tuned Nelson valve would have a lower and longer peak on CO2 versus one on HPA, depending on valve pressures. Changes in springs, power tubes, and hammer weight alter the opening movement of the valve which in turn alter the shape and peak of the pressure curve behind the ball.

So, yes R7 pressure is unregged CO2 pressure like a phantom.

Hang on....have some light reading on Nelsons;

https://www.mcarterbrown.com/forums/...eprechaun.html
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Old 07-26-2018, 02:23 PM   #6 (permalink)
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I've tried reading project leprechaun like 12 times, and never get past page 10.
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Old 07-26-2018, 02:58 PM   #7 (permalink)
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I've tried reading project leprechaun like 12 times, and never get past page 10.

Try picking up where you left off,
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Old 07-26-2018, 04:11 PM   #8 (permalink)
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It was a high speed pressure sensor with a storage oscilloscope, so plenty fast. The pics of the posted graphs have been lost to the internet a few times, I think TK gave up reposting them.

Pressure behind the ball is different from pressure at the valve. For instance, the automag with HPA measures around 450psi at the dump chamber, but around 60 psi in the breech behind the ball (peak). Nelsons do not put 800psi on the ball. Valve/powertube arrangements cause flow restrictions while the ball moves with the expanding gas, resulting in the pressure drop from dump chamber to breech.

Also, CO2 has a slower expansion than air. As CO2 pressure gets down to about 300 psi, it acts more like air. I have not seen a curve for CO2 pressure behind the ball, but would expect that a properly tuned Nelson valve would have a lower and longer peak on CO2 versus one on HPA, depending on valve pressures. Changes in springs, power tubes, and hammer weight alter the opening movement of the valve which in turn alter the shape and peak of the pressure curve behind the ball.

So, yes R7 pressure is unregged CO2 pressure like a phantom.

Hang on....have some light reading on Nelsons;

https://www.mcarterbrown.com/forums/...eprechaun.html
I think I remember Tom mentioning the shoebox Shocker had a higher breech pressure than an Automag, despite operating at over half the pressure a Mag does.
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Old 11-15-2019, 12:59 AM   #9 (permalink)
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Just stumbled on this... 90 psi is the requisite pressure.
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Old 11-15-2019, 03:35 AM   #10 (permalink)
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Is that specific to a Phantom or just the PSI required to push a paintball to 300 fps?

How do you know such things?
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