Knockdown Power

Discussion in 'General Handgun Discussion' started by Marthor, Nov 21, 2012.

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  1. Marthor

    Marthor New Member

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    This topic comes around now and then and I've read several threads, but I just thought of a new way to think about it that makes sense.

    I've read enough threads and done some calculations, to say that a 45 acp has knockdown power similar to an 80 mph fastball... which isn't that much "knockdown power". Knockdown power is generally a myth.

    The new way to think about it though is "for every action, there is an equal and opposite reaction". If you fire a weapon that knocks you back on your butt, then yes, that probably has some real "knockdown power". But that's going to be something like an elephant gun, that is hard to manhandle the kickback.

    Just thought I'd share. Knockdown power makes more sense to me thinking about it that way. Cheers! :cool:
     
  2. downsouth

    downsouth New Member

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    Question; which would you rather be hit in the chest with, an 80mph fastball or a 45 cal 230gr bullet going 850fps.

    Yep, I thought so. Case closed.
     
    Last edited: Nov 21, 2012

  3. Zamzow

    Zamzow New Member

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    What about a 12 gauge shotgun. Me thinks that has plenty of knock down power being that shotguns r normally close range.
     
  4. Marthor

    Marthor New Member

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    Not sure what your point is? The topic was "knockdown power".

    Your question is regarding the effects besides knockdown power. Reduce the surface area and increase the speed would have more penetration when it hits, but the approximate same knockdown power. So, the bullet's penetration into your chest would be less desirable.

    Wear a steel plate on your chest. The force felt will be similar.
     
    Last edited: Nov 21, 2012
  5. Marthor

    Marthor New Member

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    Regarding equal and opposite reactions...

    You can also imagine that if a 45 acp is like an 80 mph fastball, then the recoil is also similar to catching an 80mph fastball in your hands.

    Having fired enough 45 ACP and also having caught enough baseballs and softballs, I can imagine and agree that they are pretty close in the force felt.
     
  6. manta

    manta Well-Known Member Supporter

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    If you take the saying knock down power literally then as said before for every action, there is an equal and opposite reaction. So for a shotgun to have enough energy to knock Someone down it would put the person shooting the shotgun on his back shooting it. A .45 might cause a person to lie down but it won't knock him down.
     
  7. Marthor

    Marthor New Member

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    My 12 gauge shotgun has a good kick, but it doesn't knock me down when I fire it.
     
  8. HOSSFLY

    HOSSFLY New Member

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    I ain't even gettin into this again :eek:
     
  9. Garadex

    Garadex New Member

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    'nuf said...
     

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  10. zx9rt1

    zx9rt1 New Member

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    Knock down power huh? I guess you would look pretty silly every time you fired your weapon and it knocked you down. You must be talking about power factor. Yep, I'm going to pass on this topic as well.
     
  11. Marthor

    Marthor New Member

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    ..and yet the impression widely persists (probably from TV) that if you get shot by a big handgun, you'd go flying backwards across the room or with the actors' "over-acting" be knocked down really well with a big dramatic flail & twist.
     
    Last edited: Nov 21, 2012
  12. Overkill0084

    Overkill0084 Active Member

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    [​IMG]

    Nothing new under the sun.
     
  13. Zamzow

    Zamzow New Member

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    I understand what u were saying. I was just making a funny. A shotgun and a 45 acp r two totally different guns.
     
  14. HOSSFLY

    HOSSFLY New Member

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    Nope- ain't gonna do it ;)
     
  15. Marthor

    Marthor New Member

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    [ame]http://www.youtube.com/watch?v=ged4lz_Fw2Y&feature=youtube_gdata_player[/ame]

    Check out the video. You have to go up to a huge caliber rifle (elephant gun) before you get some good "knockdown power".
     
  16. Rick1967

    Rick1967 Well-Known Member

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    There is not much of anything on this thread that I agree with. But I will share one small insight. If you really think that you can measure power by recoil, you are greatly mistaken. You can shoot a solid steel 1911 and a lightweight polymer gun. Even though they shoot the same round out of the same length barrel, they will feel very different to the shooter.
     
  17. Marthor

    Marthor New Member

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    And the analogy of the fastball still works. Would it feel different if you caught a fast ball with your bare hands compared to catching it with a catchers mitt?
    The recoil is the same, the only thing that changed was the object between your hand and the force.

    Using a heavier gun is like having a bigger glove on when you catch.
     
  18. spack762

    spack762 New Member

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    What about air restince slowing the bulliet/ball? Would you feel more recoil then the target??
     
  19. Rick1967

    Rick1967 Well-Known Member

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    Wow. It just keeps going.
     
  20. Marthor

    Marthor New Member

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    Yes. If point blank, you would feel the same, but the farther away the target, you actually felt more knockdown power than the target will feel.
     
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