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    Ballistic Geek Thread

    Internal, external and terminal ballistics.

    Internal ballistics concerns what happens between the firing pin strike and the projectile leaving the muzzle.

    External ballistics concerns the flight of the projectile.

    Terminal ballistics concerns what happens when the projectile hits the target.

    I will kick it off with some internal ballistics, a 40. cal produces about 38,000 psi pressure in the bore for a millisecond.

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    Ok, terminal ballistics question? Bullet kinetic energy is measured in Ft lbs.

    As I understand it, ft lbs, lets say 90 ft lbs is the equal of 1 pound of weight falling 90 ft and hitting you.

    It is simple math, but greek until you comprehend it.

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    I know there is a simple formula for figuring kinetic energy, some thing to do with bullet weight and velocity, any one know hot it is done?

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    Newpublius's Avatar Senior Member
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    Quote Originally Posted by resister View Post
    I know there is a simple formula for figuring kinetic energy, some thing to do with bullet weight and velocity, any one know hot it is done?
    Well the real simple one is Force = mass * velocity

    Not sure if firearms have a different gauge!

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    Quote Originally Posted by Newpublius View Post
    Well the real simple one is Force = mass * velocity

    Not sure if firearms have a different gauge!
    Nope. Same for everything from a baseball to a metorite.
    I don't insult, I diagnose.

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    Quote Originally Posted by Crepitus View Post
    Nope. Same for everything from a baseball to a metorite.
    I find ballistics a fascinating field of math and physics. Gotta get me a chronograph one day.

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    Quote Originally Posted by resister View Post
    I find ballistics a fascinating field of math and physics. Gotta get me a chronograph one day.
    Every year I bring a ballistic related science project to the big family thanksgiving getogether. This year's will be a 10 foot trebuchet. Last year's was an air cannon that could fire a tennis ball 300 yards. Couple of years ago we made propane powered potato guns. Lotsa fun for the kids.
    I don't insult, I diagnose.

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    Quote Originally Posted by Crepitus View Post
    Every year I bring a ballistic related science project to the big family thanksgiving getogether. This year's will be a 10 foot trebuchet. Last year's was an air cannon that could fire a tennis ball 300 yards. Couple of years ago we made propane powered potato guns. Lotsa fun for the kids.
    There was a family on the river yesterday with some kids and a potato gun, they were having a blast!

    I would say my favorite ballistic device is the most simple, the david sling.
    Two pieces of string and a rock producing as much energy as a pistol round. Simplicity at its finest, pure instinctive shooting.

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