Can Marbles Kill?

Discussion in 'Impact studies' started by JoergS, Oct 24, 2011.

  1. JoergS

    JoergS Administrator

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    They can - if fired from a powerful slingshot. <br><br>Marbles are often used as alternative slingshot ammo. In this regard, The Slingshot Channel tests two very common myths:<br><br>- Can marbles penetrate flesh?<br>- Will marbles shatter when they hit a hard surface?<br><br>These myths are checked out, using ballistic gelatin and a solid wall. <br>See the harmless looking glass balls tearing the gelatin into shreds, <br>and see how they chip stone shards from a massive rock...<br><br><embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/JVdq1Z5cSvA" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed><br><br>The message is clear: Marbles are about as dangerous as steel balls when fired from a powerful slingshot. <br><br>A "The Slingshot Channel" production
     
  2. 3bears

    3bears New Member

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    I was watching this last night and was shocked at the penetration, I'd always thought that marbles would only be good for blunt force trauma type damage, sort of like a fowling blunt - the more i though about it though the more it made sense. i dont thing it the smoothness of the projectile, i think it's the pinpoint pressure that occurs in tandem with the uniform shape of marble. just think the initial impact- the force is focussed though a very small area, and then has the inertia to carry it through- sort of like a blunted cone? this is why the 'bonecrusher' ammo did so well it was like a fast moving circular knife <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br><br>it would be interesting to experiment with different shaped ammo I think- we all know hex nuts but I think some impact studies on other shapes would give some interesting results too ....<br><br>guess who will be spending the afternoon reading up on ballistics when he gets back form the hospital lol
     

  3. porcelanowy

    porcelanowy New Member

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    Yellow <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>Joerg, I wanted to post that kind of comment some time ago on youtube but I think now is better<br>time and place <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>I am not sure if pure gelatin is good for making statements about penetration<br>skills of different slingshot ammo. This stuff is tough, yes, but has a homogeneous<br>build. Hasn&rsquo;t got any surface layer that could imitate skin or clothing and I think<br>that fist contact can be very crucial for the penetration (you lose a lot of<br>energy at the beginning).<br>And yes, I have no idea how we could imitate skin on that gelatin <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>Cheers<br>Rafal
     
  4. JoergS

    JoergS Administrator

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    Rafal, true, clothes and skin will often prevent penetration. Still, the comparison is valid - golf balls penetrate worse than stones, stones worse than marbles, marbles worse than steel balls. <br><br>BTW, I think I own the benchmark knife from your avatar!
     
  5. porcelanowy

    porcelanowy New Member

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    Yep, it works in that comparison <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>The knife is a benchmade 913 stryker: one of my best, and the favorite one <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>Cheers<br>Rafal<br><br>Edit &ndash; by the way, I was really stunned when saw what the glass made with the stone and that<br>it bounced from the wall without shattering into small pieces <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
     
  6. Ryan Wigglesworth

    Ryan Wigglesworth Senior Member

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    My cheapo 100 for a dollar marbles are explode on contact lol<br><br>...but they are much smaller.<br><br>Crazy video! Thx!