Density of projectile material influence

Discussion in 'General Slingshot Discussions' started by arnoldus, Nov 15, 2012.

  1. arnoldus

    arnoldus New Member

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    I was thinking about why militaries use depleted uranium as munition. I had always thought that it was especially hard, but actually one good reason it is the density.<br>Newton has described an approximate function to determine penetration, that depends on the relative density of objects ( <a href="http://en.wikipedia.org/wiki/Impact_depth" target="_blank" rel="nofollow">http://en.wikipedia.org/wiki/Impact_depth</a> ).<br><br>It's also often discussed among shooters that lead replacements (bismuth and steel) don't reach as far, and carry less energy.<br><br>Here is a list of densities: <a href="http://en.wikipedia.org/wiki/Density#Densities_of_various_materials" target="_blank" rel="nofollow">http://en.wikipedia.org/wiki/Density#Densities_of_various_materials</a><br><strong>Steel 8g/cm³ (-27%)<br>Lead 11g/cm³ (benchmark)<br>Tungsten Carbide 15.6g/cm³(+ 40%)<br>Tungsten, Uranium, Gold 19g/cm³ (+71%)<br>Platinum 21g/cm³ (+90%)</strong><br><br>Now, of course Gold and Platinum could be used, but one would be very keen to recuperate the balls.<br><br>This only leaves Tungsten and Tungsten Carbide as interesting and somewhat easily available alternatives to experiment with.<br><br>Does anyone here know of tests with these materials, either slingshot or bullet related?<br>
     
  2. CEZ

    CEZ New Member

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    Shooting gold balls.. ghangstah style!<br>You got me interested, I did a search and did not find Tungsten balls... I found the next best thing though, tungsten rods! <br>I have read somewhere here about shooting cut pieces of steel rod and supposedly there is not much speed difference between that and a sphere shape.<br>Unfortunately the material isn't very cheap so I'll pass on that.
     

  3. EyAlter

    EyAlter New Member

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    how about casting aerodynamic lead balls?
     
  4. ahlver jonsson

    ahlver jonsson New Member

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    i've read somewhere, that the best aerodynamics for a ball is the shape of a golf ball.
     
  5. EyAlter

    EyAlter New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>ahlver jonsson wrote:</b></span></td></tr>
    <tr><td class="quote">i've read somewhere, that the best aerodynamics for a ball is the shape of a golf ball.</td></tr>
    </table>
    <span class="postbody"><br><br>good point, but then bombs are not shapes like gold balls. </span>
     
  6. Flipgun

    Flipgun Well-Known Member

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    <div>
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>spooner777 wrote:</b></span></td></tr>
    <tr><td class="quote">how about casting aerodynamic lead balls?</td></tr>
    </table>
    <span class="postbody"><br><br>The Romans had it. <a href="http://historyofinformation.com/images/sling_bullets.jpg" target="_blank" rel="nofollow">http://historyofinformation.com/images/sling_bullets.jpg</a><br><br>It's doable.</span>
    </div><div class="clear"></div><div class="signature_div">
    <br>Failed perception is when you have a gun, I have a slingshot and you think you are the only one that is armed. <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7">
    </div>
     
  7. poudreverte

    poudreverte New Member

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    <div>high density and aerodynamic have sense only for high speed projectiles, specially to reduce the caliber and control the orientation in flight... not sure they concern slingshots.</div><div class="clear"></div><div class="signature_div">
    <br>Love shooting <img src="http://illiweb.com/fa/i/smiles/icon_tongue.png" alt="tongue" longdesc="24">
    </div>
     
  8. EyAlter

    EyAlter New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Flipgun wrote:</b></span></td></tr>
    <tr><td class="quote">
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>spooner777 wrote:</b></span></td></tr>
    <tr><td class="quote">how about casting aerodynamic lead balls?</td></tr>
    </table>
    <span class="postbody"><br><br>The Romans had it. <a href="http://historyofinformation.com/images/sling_bullets.jpg" target="_blank" rel="nofollow">http://historyofinformation.com/images/sling_bullets.jpg</a><br><br>It's doable.</span>
    </td></tr>
    </table>
    <span class="postbody"><br><br>I guess they had some kind of fluffy wool at one end or maybe strings. Otherwise it would not fly straight. </span>
     
  9. Arturo Borquez

    Arturo Borquez Administrator

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>poudreverte wrote:</b></span></td></tr>
    <tr><td class="quote">high density and aerodynamic have sense only for high speed projectiles, specially to reduce the caliber and control the orientation in flight... not sure they concern slingshots.</td></tr>
    </table>
    <span class="postbody"><br>aerodynamics play a little role when the ammo is spherical like steel or lead balls, even steel rods flies good, more density is better to get more penetration ... </span>
     
  10. <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Spooner777 wrote:</b></span></td></tr>
    <tr><td class="quote">I guess they had some kind of fluffy wool at one end or maybe strings. Otherwise it would not fly straight. </td></tr>
    </table>
    <span class="postbody"><br><br>They were launched from slings and had no tails of any kind. The way they leave the sling rights them in the air.</span>
     
  11. otta88sun

    otta88sun New Member

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    Good POST <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15"><br>so i like physic and i'll explain my point of view.<br><br>At the same VOLUME and FORM<br>HEAVY AMMO = loose less energy (respect a soft one) during its way<br><br>So, use a more densite bullet means more final joule and less speed loose during its way.<br>That's why them use high densities.. if them use same material (but bigger bullet) they'll have same weight like a high density one...and during its way the air slow the bullet easyer...<br>i don't think to be really clear (if ?, ask me) <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
     
  12. otta88sun

    otta88sun New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>Flipgun wrote:</b></span></td></tr>
    <tr><td class="quote">
    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>spooner777 wrote:</b></span></td></tr>
    <tr><td class="quote">how about casting aerodynamic lead balls?</td></tr>
    </table>
    <span class="postbody"><br>Failed perception is when you have a gun, I have a slingshot and you think you are the only one that is armed. <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"></span>
    </td></tr>
    </table>
    <span class="postbody"><br><br>ehehehe.... i think that too! <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15"></span>
     
  13. meeeee!

    meeeee! New Member

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    higher density projectiles have less resistance, both from air and the target, so they loose less energy during travel and that energy is then concentrated to a smaller part of the target allowing for deeper penetration.