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Cold Weather And Poi

Discussion in 'Anything Airgun Related' started by C3PO, Oct 12, 2019 at 10:14 PM.

  1. C3PO

    C3PO Member

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    What a sudden change to cold, dense air can do for your POI. 35 yard zero at 35 yards. Ten degree drop in temperature saw it fall this much in a week. HW100KT Weihrauch FT 4.53s .177. 10 shots. E71F3C8E-9B62-422C-844A-8D8576255ED0.jpeg
     
    Last edited: Oct 12, 2019 at 10:21 PM
    cloverleaf and TR158 like this.
  2. Tyler durdon

    Tyler durdon Posting Addict

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    Yes but the bunny is still dead ! Good shooting
     
    jonnyuk and C3PO like this.
  3. Richard Ellis Jones

    Richard Ellis Jones Engaging Member

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    Was the cylinder pressure the same? Also denser colder air will have more friction on pellet during flight. Couple of clicks up should sort it :thumb:
     
  4. BallisticBill

    BallisticBill Busy Member

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    Another HW100 issue the fans are in denial over... the viscosity of Weihrauch lube is temperature sensitive. Check it out with a chrono.
     
  5. Richard Ellis Jones

    Richard Ellis Jones Engaging Member

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    Best to clean all the gunk off and use mineral oil
     
  6. C3PO

    C3PO Member

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    Here’s how it looks.... 2FD7A5C4-1863-4E29-9ECD-2848459F5082.jpeg
     
  7. Nobby

    Nobby Posting Addict

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    It's not a straightforward matter, this change of air temperature. The density of the air, assuming no change in absolute humidity, changes very nearly linearly inversely with the absolute temperature. For example, if the temperature falls from 20 degrees to 10 degrees then the air density goes up in the proportion (273 + 20)/(273 + 10) which is about 3.5%.

    However the viscosity of the air, its "stickiness", changes in the other direction, becoming less viscous and more slippery as it gets colder. It's a secondary effect compared to the density change.

    Some FT shooters will tell you that the crucial point is when the air is on the point of being fully saturated, where a drop in temperature will lead to water vapour being condensed out and forming a mist. This usually only occurs on cold mornings as the relative humidity soon drops once the sun starts to rise. But there can be occasions when the first rays of sun warm the ground and not the air, and if that ground is grassland it can lead to an increase in humidity as the dampness and dew is boiled off.

    One of the delights of shooting FT, as if the wind wasn't enough.
     

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