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Thread: Could Muzzle Blast start a grass fire

  1. #1
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    Could Muzzle Blast start a grass fire

    Interesting thought, and it has me bothered with all the brown/grey grass around and long brown grass on farms etc.

    The heat impulse is fast with minimal duration, but just on last light I often lose my sight picture to a pale yellow flash from the Rem mag........









    Anyone tried it or seen a fire ignite this way ?
    A big fast bullet beats a little fast bullet every time

  2. #2
    OPCz Rushy's Avatar
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    Absolutely it could.
    It takes 43 muscle's to frown and 17 to smile, but only 3 for proper trigger pull.
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  3. #3
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    Why 7mmsaum, something you want to share with the group? ;-) I would say yes, given how little moisture is in the fuel (grass) I would say it needs very little help.
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    damn true !!

  5. #5
    Member keneff's Avatar
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    Especially shooting from prone.
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  6. #6
    Member 300CALMAN's Avatar
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    definitely

  7. #7
    P38
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    I'd say yes

    Muzzle blast has the potential to start a grass fire, especially if there is any unburnt powder exiting from the muzzle

    Black powder rifles would be a prime candidate for this too.

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  8. #8
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    I would say possible but, unlikely. The general gist of it is that the flame needs to be held onto the fuel long enough and hot enough to start the process called pyrolysis (decomposition of material caused by high temperature). It is the gasses given off by the pyrolysis process that burn, not the solid.

    The end result, is that the flame front from muzzle blast is that fast moving and short in duration that I doubt that pyrolysis could take place and then the gasses created actually combust.

    Now, that's not to say that it can't happen and that other aspects of firearms use could cause a fire (tracer being a good example) but unless you are mag dumping several 30-round mags over the same spot I would class it as unlikely. I parked over some really dead grass today and blackened it with the exhaust (direct contact) and that was after 15mins.
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  9. #9
    MSL
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    I reckon the blast is too turbulent and the flame would be extinguished by the pressure wave before being able to get going

  10. #10
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    Quote Originally Posted by 7mmsaum View Post
    Interesting thought, and it has me bothered with all the brown/grey grass around and long brown grass on farms etc.

    The heat impulse is fast with minimal duration, but just on last light I often lose my sight picture to a pale yellow flash from the Rem mag........









    Anyone tried it or seen a fire ignite this way ?
    Have you been Te Pohue/ Puketitiri way lately @7mmsaum?
    Experience. What you get just after you needed it.

  11. #11
    R93
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    All the live firing I have participated in while in the Army especially in some areas that it should not have been allowed due to the dry, I have only seen fires started at the impact end from small arms.

    I have seen one started (quickky extinguished) by a SF gun barrel when changed in a hurry once.

    Seen fires started by 106 recoiless and 84 mm CG from back and muzzle blast.

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  12. #12
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    Family live there, so most weeks.

    Was just a thought in light of today's fires and as most LR shots are taken prone It got me thinking.

    I'm not keen to test it but I think light fluffy grass might be a serious risk to shoot through/over.

    I know the Army has lit the tussock up a few times, but that's probably HE and thunder flashes, have hunted nervously downwind of the armies big smoke storm in 2007, which in flammable material lacked fun in every way, until the wind direction changed.




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  13. #13
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    I've had dry grass glow and smoulder whilst shooting on the ground using a muzzle brake so it will happen with a radial brake at least.

    Also burnt through an old blanket I was using as a shooting mat once.

    Muzzle brakes are shit, when they are not blowing dirt into your face and optics they are fuc*ing your ears, your mates ears and catching shit on fire!

  14. #14
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    Could Muzzle Blast start a grass fire

    Thanks for that info Tui4me.
    A big fast bullet beats a little fast bullet every time

  15. #15
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    Quote Originally Posted by Tui4Me View Post
    I've had dry grass glow and smoulder whilst shooting on the ground using a muzzle brake so it will happen with a radial brake at least.

    Also burnt through an old blanket I was using as a shooting mat once.

    Muzzle brakes are shit, when they are not blowing dirt into your face and optics they are fuc*ing your ears, your mates ears and catching shit on fire!
    I'm lucky with my radial brake if there is any grass left... Not a lot of chance of it smouldering to be fair!

 

 

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