Pcp efficiency ?

Forums PCP Airguns Pcp efficiency ?

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    bucketboy
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    Has anyone come up with a simple way to measure the amount of air used each shot rather than just shooting pellets and counting the shots?

    when tuning a gun, it would be really handy if I could just capture the air being discharged and measuring the volume.

     

    Bb

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    TarheelScott
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    edgun edmu ?

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    Dairyboy
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    The EDMU has a bar per shot feature which I find works very well. Like now I have my Leshiy tuned to shoot about 6.3 bar a shot at 22fpe.

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    TarheelScott
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    lol πŸ˜

     

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    bucketboy
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    TarheelScott

    edgun edmu ?

    Thanks, Yeah, I have look at those but I would need to figure out how to fit them to all the different rifles I tune.

     

    Bb

     

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    Dairyboy
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    TarheelScott

    lol πŸ˜

     

    Great minds think alike! Lol

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    bucketboy
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    Dairyboy

    The EDMU has a bar per shot feature which I find works very well. Like now I have my Leshiy tuned to shoot about 6.3 bar a shot at 22fpe.

    Thanks but surely the measurements you quoted would vary depending on the volume of the storage vessels?

     

    Bb

     

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    Mikepr
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    If you have the exactly bar per shot and the bottle cc, with a type you can measure the cc per shot

    2 bar per shot at 150cc and 300cc bottle is double cc per shot 

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    Cranky1
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    Maybe a flow meter hook Directly to the barrel? Plus you would need to know the volume of the barrel and pipe to the meter. I wonder if porting all the 90s in the system with a radius could increase efficiency with the same amount of flow. 

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    Dairyboy
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    bucketboy

    Dairyboy

    The EDMU has a bar per shot feature which I find works very well. Like now I have my Leshiy tuned to shoot about 6.3 bar a shot at 22fpe.

    Thanks but surely the measurements you quoted would vary depending on the volume of the storage vessels?

     

    Bb

     

    Correct. A 250mm barrel with 41cc before the reg 13cc plenum. If you know your volume of the gun it's quite easy actually. The EDMU measures the pressure drop for each shot and on avg. So say you take 10 shots and it'll read the avg bar or psi per shot over those 10 shots. Or whatever your looking for. Then you can calculate it from there. I use this

    http://www.calc.sikes.us/1/

    • This reply was modified 1 month ago by Dairyboy.
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    bucketboy
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    Dairyboy

    bucketboy

    Dairyboy

    The EDMU has a bar per shot feature which I find works very well. Like now I have my Leshiy tuned to shoot about 6.3 bar a shot at 22fpe.

    Thanks but surely the measurements you quoted would vary depending on the volume of the storage vessels?

     

    Bb

     

    Correct. A 250mm barrel with 41cc before the reg 13cc plenum. If you know your volume of the gun it's quite easy actually. The EDMU measures the pressure drop for each shot and on avg. So say you take 10 shots and it'll read the avg bar or psi per shot over those 10 shots. Or whatever your looking for. Then you can calculate it from there. I use this

    http://www.calc.sikes.us/1/

    That’s what I was looking for, thanksπŸ‘

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    Rj
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    Could you tether the edmu from a fill source? That way it could be plugged into any rifle.

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    bucketboy
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    Rj

    Could you tether the edmu from a fill source? That way it could be plugged into any rifle.

    Clever πŸ‘

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    T3PRanch
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    Sounds like a question for Bob Sterne or LLoyd Sikes. ;)

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    oldsparky
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    This makes me think of a question? But I need to relate it to something I understand a little. When I use to work on high pressure circuit breakers one test that was done to evaluate performance and check for internal condition in-between rebuilds was air consumption per operation. To measure this we used a calibration gauge, operate the breaker,  measuring  pressure drop. While watching the gauge the pressure would rise a couple psi. After a minute or so. The pressure drop would be a larger number than the air consumption really was. Now here is my question. Does the same thing happen to airguns? Is that something that is happening making us think a regulator is slow at recovering? Any thoughts? Sorry if this was a stupid question because of the relation.

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    mcoulter
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    Over on GTA TriggerTreat (Keith) has a fantastic Excel spreadsheet that includes efficiency calculations:

    https://www.gatewaytoairguns.org/GTA/index.php?topic=146784.msg1545959#msg1545959

    Trust me, it's worth taking the time to learn how to use it!  Here's a screenshot of some of its graphs.  

     

    • This reply was modified 1 month ago by mcoulter.
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