Redux data: HPA to CO2 velocity shift
I tested Redux 043 yesterday on both 12-gram CO2 and HPA via remote and wanted to post results.
This is meant as a general guideline to give users an idea of what to expect when making a switch between constant air with an HPA source and 12-gram CO2.
I observed a velocity shift of 15fps, making no changes other than substituting HPA for CO2, with CO2 having the higher velocity. (~285fps on CO2, ~270fps on HPA)
HPA tanks typically output at 800psi and CO2 is ~850psi at room temperature which is a component of the velocity change, along with valve configuration.
All this to say, if you're making a switch between HPA and CO2 and have a Redux configured similarly to my own as many are, expect about a 15fps velocity change.
Great stuff Cj, what size if tank did you use and do you happen to have a total shot count? Im thinking DDay here.
No shot count as I didn't empty the tank but 1,000psi gave me 40+ shots, possibly a lot more.
Figure 100+ shots from a 13/3k tank but a well tuned pump might net you 200+ shots.
Awesome info CJ! thanks!
That is very interesting. On my Sheridan's I always observed a more severe drop in velocity. Roughly a 35FPS drop. Since I ran my markers at 275FPS, I would always get about 240FPS with HPA. Didn't notice much difference between my 850PSI output tank, or my 900PSI output tank either.
How was the difference in report?
CO2 produced a bit more quiet shot than HPA.
I wouldn't be surprised if the velocity change I observed was on the low end of possible; it was cool out (less than 65F) so the CO2 wasn't at as high a pressure as it would be at 70 or 80F.
See this graph of CO2 pressure versus temperature.
What is really needed is to see what the differences are, when the output of both the CO2 and the HPA are exactly the same. That would allow us to determine the difference in the gas' "efficency" in pushing a paintball. Then a formula could be determined to allow someone to understand what must be done to change from CO2 to HPA and back without the massive changes in velocity.
You would run them both through an HP reg, you will usually find CO2 to produce a higher speed at the same pressure with different valves having higher differences.
This is because CO2 has a low compressibility factor(iirc ~0.4 compared to 1.1 for HPA at 1000psi). Meaning it is denser at high pressure and as the pressure goes down it expands faster. It doesn't necessarily mean it is more efficient by weight(it isn't) but combined with condensation it is obviously more efficient by space. The sound thing is related to the speed of sound in different gasses
|All times are GMT -4. The time now is 06:42 PM.|
Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2013, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO
© MCB Network LLC