Drop in power

Discussion in 'General Airgun Chat' started by mak1, Feb 2, 2019.

  1. mak1

    mak1 Member

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    I know but i know the temperature can affect a gun power but i have never experienced it until possible today I have a hw100 that is normally running at 11.7 with 8.4jsb. I noticed today that my zerowas off when I checkedche gun it was working at 10.4 is this a normal expectation of temperature affecting things or is there more to worry about
     
  2. Halesowen Kid

    Halesowen Kid Member

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    I'll watch with interest as my mate has had the same issue only yesterday....
     
  3. frank

    frank Reactive Member

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    Yes, Its normal, Large drops or increases it temp have a marked effect on power
     
  4. RobF

    RobF Administrator Staff Member

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    What temperature was the 11.7 set at, and what was the temperature the 10.4 was at?
     
  5. Spoilt_scorecard

    Spoilt_scorecard All the gear and no idea.

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    It is a common problem on the HW100 considering the recent abnormal cold temperatures. It affected one of my HW100's but as soon as the temps rise your power will be back to your 'normal'. The loss of power you had is the same as what I experienced. I am reliably informed it is to do with the grease that Weihrauch use. It just needs degreasing if you can be bothered. What I wouldn't do is to remove the anti-tamper and turn it up, as once the warm weather comes it will be way over 12ft/lb(fac) and will also void your warranty. There is a short youtube video by Cubleycat called "Affect on cold on pcp rifle HW100"............... to put your mind at ease and to show you how to degrease it..
     
    Last edited: Feb 2, 2019
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  6. RAF

    RAF Member

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    im having the same problem with my dominator today....dropping 10mm low at 50 /55 yds
     
  7. mak1

    mak1 Member

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    Thanks for that lad'
    I have heard of it but never experienced it I did go and stand near the heater with my rifle for a bit and then run it back through and the power started to slowly increase with me in the first time I've experienced it I didn't know just how much it would drop I haven't use this gun for a good few months so I was just curious
     
  8. Dan Smith

    Dan Smith Active Member

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    Some clever member on here suggested the relationship between power and temperature was linear when you use degrees Kelvin.
     
  9. frank

    frank Reactive Member

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    The drop in power will be seen on all guns including a degreased hw100,removing the grease will help though
     
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  10. Jesim1

    Jesim1 Active Member

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    There was a big thread on this recently and it's very common on almost all rifles with the biggest possible difference being as Frank has stated. I certainly have seen a full fpe change on some of mine, although I've not tested them all or particularly looked for it.
     
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  11. Dan Smith

    Dan Smith Active Member

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    I’ve read this thread and the one a week or so back on the same topic - won’t part of the issue be pellet temperature, it’s not just the gun?
     
  12. bootneckbob

    bootneckbob Active Member

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    Gents, everything changes it's behavior in extremes of temperature. The good news is YOU know this so YOU can adapt to this. It's cold outside, put some more layers on. It's cold outside and I'm shooting-I'll need to allow for a drop; it's just part of life.
     
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  13. bootneckbob

    bootneckbob Active Member

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    I'm now waiting for someone to come along and list things that don't change at all. Oh no I'm not; I'm off to shoot at -1C which will be 4C before I'm finished on the course.
     
  14. Jesim1

    Jesim1 Active Member

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    Stay focused on the course targets Rob, Magpies can be a distraction in this weather:

    [​IMG]
     
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  15. bootneckbob

    bootneckbob Active Member

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    Hi James. I know you know that they have adapted to their environment. They will freeze too if they go it alone when it's proper cold!:)
     
  16. Chalkie

    Chalkie New Member

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    Why do think the temperature of the pellet is a factor?
     
  17. hmangphilly

    hmangphilly Floppy Quick Phil

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  18. Nick G

    Nick G Active Member

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    If you remove the grease from your hw100, chances are the power will increase, as the hammer will travel faster, so check and adjust power after.
     
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  19. Chalkie

    Chalkie New Member

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    I'm fully aware that metals expand and contract with temperature, but on the diameter of a pellet??????
     
  20. Dan Smith

    Dan Smith Active Member

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    I think a warmer and softer pellet might react differently down the barrel than a cold one - I have no science to back this up!!
     

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