Air arms s500 bell curve

Forums PCP Airguns Air arms s500 bell curve

  • Views : 1318
  • Link

    sean48855
    Participant
    Member

    10.34 jsb and it is a extra

    Link

    BigTinBoat
    Participant
    Member

    “sean48855”10.34 jsb and it is a extra

    
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?

    Link

    sean48855
    Participant
    Member

    I’m filling to 200bar according to my omega 4500psi tank gauge and then reading from the gun after shooting

    Link

    sean48855
    Participant
    Member

    So I just filled my gun to 200 on the tank gauge and the guns gauge is reading about 185ish

    Link

    BigTinBoat
    Participant
    Member

    “sean48855”So I just filled my gun to 200 on the tank gauge and the guns gauge is reading about 185ish

    
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.

    Link

    sean48855
    Participant
    Member

    Well according to the gauge on the gun I start just under 200 and end at 155ish

    Link

    sean48855
    Participant
    Member

    I will be trying to fill to 200 on the gun gauge tonight and see what happens

    Link

    BigTinBoat
    Participant
    Member

    “sean48855”Well according to the gauge on the gun I start just under 200 and end at 155ish

     

    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
     

    Link

    sean48855
    Participant
    Member

    Okay I will try that tonight thank you for all the help and advice so far

Viewing 9 posts - 21 through 29 (of 29 total)

You must be logged in to reply to this topic.