Steel bolt tips - best penetration?

Discussion in 'General Slingshot Discussions' started by JoergS, Dec 27, 2012.

  1. JoergS

    JoergS Administrator

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    I tested some more with my 9" nail shooter. <br><br>Made two different tips and compared them to the original nail tip. <br><br>Round and pointy, bodkin, and original:<br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/pentra10.jpg" border="0" alt=""><br><br>The above picture shows the penetration into a wooden board (grown, not a particle board). <br><br>The round and bodkin did considerably better than the original nail.<br><br>Then I shot all of them into my archery foam target. <br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/pentra11.jpg" border="0" alt=""><br><br>The result: All three bolts penetrated exactly the same. <br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/pentra12.jpg" border="0" alt=""><br><br>I still think the bodkin would do the best job on clothes, skin and tissue.
     
  2. FIAAO

    FIAAO Failureisalwaysanoption

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    Interesting... Thanks to the "cutting-effect" you talked about in the video, right?
     

  3. Achso_42

    Achso_42 Senior Member

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    The edges deliver more energy to the target, so they can crack chainmail.
     
  4. Lars

    Lars The Evil Genious

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    <div>did you hurt your hand?</div><div class="clear"></div><div class="signature_div">
    <br>hmm nice slingshot!<br>maybe needs some sanding and oiling <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><br><a href="http://www.youtube.com/user/selfmademilitary" class="postlink" target="_blank" rel="nofollow">my Channel . . . . . Selfmademilitary</a><br><a href="http://slingshotforum.forumieren.com/" class="postlink" target="_blank" rel="nofollow">My Forum</a>
    </div>
     
  5. JoergS

    JoergS Administrator

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    I switched to a thinner board (floorboard) and also I made two more test arrows. <br><br>One nail with a very thin steel tip, and then one normal carbon arrow with a regular field tip, shortened to 9". It weighs 11.5 gramms, about half as much as the nails. <br><br>Fired all of them into the board.<br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/pentra13.jpg" border="0" alt=""><br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/pentra14.jpg" border="0" alt=""><br><br>The result: Best penetration has the thin tip - but it would cause much less damage. <br><br>Not far behind is the original nail tip.<br><br>Then the round tip. Then the bodkin. Last in the series: The carbon bolt with the field tip. <br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/pentra15.jpg" border="0" alt=""><br><br>Interesting! I think the explanation is clear - the nail designers obviously tested which tip does best regarding wood penetration. A Zombie skull is probably a lot like a wooden board - so the original tip makes a lot of sense when you hunt Zombies.
     
  6. Achso_42

    Achso_42 Senior Member

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    You could test it on some animal bones, with less power.
     
  7. von_z2

    von_z2 New Member

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    <div>I think it's time to get yourself some human skull analogs, Joerg. You owe it to yourself and us. <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
    </div><div class="clear"></div><div class="signature_div">
    <br>"non impediti ratione cogitationis" <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
    </div>
     
  8. FIAAO

    FIAAO Failureisalwaysanoption

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    Interesting (again <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"> )
     
  9. slingpit

    slingpit Slingshot addicted

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    Sharp them with`a grinder in 4 sections. it will help
     
  10. MaddyMax

    MaddyMax New Member

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>JoergS wrote:</b></span></td></tr>
    <tr><td class="quote">Interesting! I think the explanation is clear - the nail designers obviously tested which tip does best regarding wood penetration.</td></tr>
    </table>
    <span class="postbody"><br><br>once again i learned something. it's like "never touch a running system".</span>
     
  11. JoergS

    JoergS Administrator

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    <table width="90%" cellspacing="1" cellpadding="0" border="0" align="center">
    <tr><td><span class="genmed"><b>slingpit wrote:</b></span></td></tr>
    <tr><td class="quote">Sharp them with`a grinder in 4 sections. it will help</td></tr>
    </table>
    <span class="postbody"><br><br>That is what I did to create the bodkin tip. I even hardened the edges. </span>
     
  12. Lars

    Lars The Evil Genious

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    <div>you could make the tip 3cm liong smaller with a tip of grinded bodkin <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
    </div><div class="clear"></div><div class="signature_div">
    <br>hmm nice slingshot!<br>maybe needs some sanding and oiling <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><br><a href="http://www.youtube.com/user/selfmademilitary" class="postlink" target="_blank" rel="nofollow">my Channel . . . . . Selfmademilitary</a><br><a href="http://slingshotforum.forumieren.com/" class="postlink" target="_blank" rel="nofollow">My Forum</a>
    </div>
     
  13. mhpr262

    mhpr262 Member

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    Over what distance can these nails be shot without starting to tumble in midair?
     
  14. jonathanfv

    jonathanfv Member

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    What about making a bodkin with a narrower neck? It would create some kind or barb, and make it harder to pull out from flesh without tearing everything. <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2">
     
  15. ahlver jonsson

    ahlver jonsson New Member

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    i think the bodkin isn't enought fine.<br>for exemple, this is my first archery type bodkin that i forged few year ago :<br><br><a href="http://www.servimg.com/image_preview.php?i=31&u=17826958" class="postlink" target="_blank" rel="nofollow"><img src="http://i16.servimg.com/u/f16/17/82/69/58/sam_0417.jpg" border="0" alt=""></a><br><br><br>you can see that the tip is fine angled , yours is with a heavy angle, like the nail at the beginning.<br>try with fine it out in square with a hammer, by forginf it you'll not loose some weight and gain some strengh, espacially if you temper it in salty water after <img src="http://illiweb.com/fa/i/smiles/icon_wink.gif" alt="Wink" longdesc="15">
     
  16. tokSick

    tokSick Senior Member

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    Hi,<br><br>Did you try to flaten the tip of a nail and sharpen the two edges? I hope you understand what i mean.
     
  17. JoergS

    JoergS Administrator

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    Like this?<br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/nail110.jpg" border="0" alt=""><br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/nail210.jpg" border="0" alt=""><br><br>This is for fleshier targets... even though I hardened the "blade", the steel is low grade and the thin metal will bend easily.
     
  18. 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>tokSick wrote:</b></span></td></tr>
    <tr><td class="quote">Hi,<br><br>Did you try to flaten the tip of a nail and sharpen the two edges? I hope you understand what i mean.</td></tr>
    </table>
    <span class="postbody"><br>tokSick & Jeorg that's nice, that shape will penetrate very good and if the tip bents or breaks during impact it will be a lot more deadlier ... I am thinking to test them with my crossbow with some little critters ...</span>
     
  19. JoergS

    JoergS Administrator

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    Well, I will do some gelatin tests tomorrow.
     
  20. JoergS

    JoergS Administrator

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    Tested different bolts against a fir plank... the bodkin did best, the round tip came second. <br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/nails710.jpg" border="0" alt=""><br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/nails810.jpg" border="0" alt=""><br><br>The original nail did not stick in, the wood wasn't split. <br><br><img src="http://i14.servimg.com/u/f14/16/32/46/92/nails910.jpg" border="0" alt=""><br><br>I think this is not much of a surprise... nails aren't supposed to cause splits in the wood. Once again I applaud the engineering skills of the nail makers.