Air arms s500 bell curve
- Thread starter sean48855
- Start date
That's not good at all. Your efficiency is calculating out to be .77 fpe/cuin. Maybe it's your gauge? Are you filling from a pump with gauge? or a tank with gauge?
I'm guessing the BAR reading are from the AA gauge?
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I'm filling to 200bar according to my omega 4500psi tank gauge and then reading from the gun after shooting
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So I just filled my gun to 200 on the tank gauge and the guns gauge is reading about 185ish
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OK, that's a bit better. If you you are using the ending pressure reading from the gauge then also use the starting pressure from the gauge. From 185 bar down to 125 bar your efficiency is now 1.11, not good, but respectful. Personally I would fill the gun so that the gauge on the gun is at 200 bar and I'd be willing to bet you get a bell shaped curve.
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I would first disassemble the gun and be certain the spring and hammer are working as they should. Make sure all the parts are in correctly and that there is no drag on the hammer. Basically eliminate anything mechanical that would be messing with your results.
Then what I would do is fill the gun to 200bar on your gun gauge. Close your tank valve but leave the tank attached. When you do this your fill gauge will show the pressure in the gun cylinder. Most fill adapters have pressures in psi so I would use that to get a little more precise.
I would make sure your port constrictor is wide open for the testing as it severely cuts down your efficiency at lower power levels.
Shoot a 100 shot string and note the pressure on the tank gauge (because it should be more accurate) for every 5 shots.
Something like this
1 890 3000
2 890
3 885
4 885
5 890 2925
6 895
7 895
8 900
9 900
10 905 2825
etc on till 100 shots
Post the results
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