Medieval-style Compound Bow

Discussion in 'Off Topic' started by FIAAO, Mar 10, 2013.

  1. FIAAO

    FIAAO Failureisalwaysanoption

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    I took the stock from the failed Raptor and modified it a bit... <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>The exchange of the compound-system was greater than I tought; the four pretty tough PVC-"bows" gave the bow a draw-weight of almost nothing... But it works excellent and Im very happy! I will later make this stronger by switching the PVC-parts for something more sturdy <img src="http://illiweb.com/fa/i/smiles/icon_twisted.gif" alt="Twisted Evil" longdesc="13"><br><br><img src="http://i72.servimg.com/u/f72/17/50/40/49/compou10.jpg" border="0" alt=""><br>As you can see in this pic it got a very long draw and the let-off works great:<br><img src="http://i72.servimg.com/u/f72/17/50/40/49/compou11.jpg" border="0" alt=""><br>Here it is in comparison to my regular bow. They have the same drawlength but not (yet) the same power. <br><img src="http://i72.servimg.com/u/f72/17/50/40/49/compou12.jpg" border="0" alt=""><br>I will make it nicer when its powerful. Im going to attach scales and probably paint it <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br>//Failure
     
  2. CEZ

    CEZ New Member

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    Wow, interesting construction, I don't get how it works though, would you upload a higher res picture?
     

  3. onnod

    onnod Im from Holland, isnt that weird?

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    very cool, but don't understand it either, could you please explain this
     
  4. FIAAO

    FIAAO Failureisalwaysanoption

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    Thanks guys! <img src="http://illiweb.com/fa/i/smiles/icon_smile.gif" alt="Smile" longdesc="2"><br><br>This design was made by the fastest archer in the world, the danish Lars Andersen. You can see his bow and maybe learn how it works in this vid:<br><embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/TNgm7kG_tSg" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed>
     
  5. e_monster55

    e_monster55 New Member

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    Very nice design, imagine what the world would have been like if they had compound bows?<br><img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1">
     
  6. Camo-sling

    Camo-sling New Member

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    <div>Great concept, interesting to see how strong the bow will get</div><div class="clear"></div><div class="signature_div">
    <br><a href="http://www.youtube.com/smabber" target="_blank" rel="nofollow">www.youtube.com/smabber</a> - My slinging video channel</div>
     
  7. jynx_474

    jynx_474 New Member

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    I'm not sure if you've made any improvements on your bow yet, but if you haven't I could offer a couple of things you could do to increase draw weight and performance.

    1. You could double or triple sleeve the pipe that you're using for the limbs
    (depending on whether or not you're using PN12 or PN15 PVC-U If you can find PN25 you don't need to
    double sleeve as it's walls are almost as thick as American Schedule 40)
    2. When you flatten the pipe you want to make sure that it's taper from the front of the limb to the back
    (2.54cm down to 1.27cm)
    3. Increase the limb angle by cutting a 15 degree angle off the tips of the riser towards the back of the bow
    (the side that faces away from you)
     
    Last edited: Mar 7, 2014
  8. jynx_474

    jynx_474 New Member

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    By the way... What did you make the outboard limbs out of?
     
  9. epic!
    i would love to see a video of you shooting it!
     
  10. brennanfry

    brennanfry New Member

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    i understand how it works but its a bugger to explane
     
  11. jynx_474

    jynx_474 New Member

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    @ brennanfry

    Easily enough explained how the outboard limbs work. The forward levers pull the cables and "power" limbs together as you draw the string back
    as soon as they reach an angle of 85 degrees or greater then the weight will let off (in the case of a lever limb compound bow that can be as much as 90%) when the arrow is loosed the outboards will snap back to rest due to the tension of the cables/ "power" limbs and

    these types of bows also tend to propell the arrow at a greater speed than a conventional bow due to greater efficiency of kinetic energy transfer due to the forces applied to the cables, the power limbs and the outboard limbs i.e leverage ^_^
     
  12. brennanfry

    brennanfry New Member

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    That was a little bit over complicated but ya
     
  13. jynx_474

    jynx_474 New Member

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    Yeah sorry about that, I'm a bowyer by trade and I tend to get a little technical at times. And I also tend to ramble more often than not ^_^
     
  14. brennanfry

    brennanfry New Member

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  15. jynx_474

    jynx_474 New Member

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    Yep, PVC bows Mostly. They're a lot easier to make than wooden or composite (horn and sinew) bows, since tapering the pipe saves one a lot of guess work
     
    Last edited: Mar 12, 2014
  16. brennanfry

    brennanfry New Member

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    i tryed to make a bow but i don't have the patience
     
  17. jynx_474

    jynx_474 New Member

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    what kind of bow did you try to make?
     
  18. jynx_474

    jynx_474 New Member

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    Got you on that, Birch isn't the most forgiving wood to work with
     
  19. combatarcher

    combatarcher New Member

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    not an orginal idea

    This is not an orginal idea please check out monster bows. The company is now closed but you can go to 5150 bows and see all kind of leverlimb bows this is just a knock off of one of their designs