Slingbow vs Longbow arrow travel

Discussion in 'General Slingshot Discussions' started by Artifex, May 25, 2012.

  1. Artifex

    Artifex New Member

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    We've all probably seen slow motion video of an arrow fired from a longbow in flight. The arrow tends to flex and 'wobble' (for lack of a proper term) in flight. Do the arrows fired from a slingbow do this as well? <br><br>I haven't seen slow video of a compound bow with something like a whisker biscuit however... does the type of arrow rest also minimize the wobble? Jorg has shown that a slingbow can match the power of a typical bow, I'm wondering which would give the greatest accuracy.
     
  2. JoergS

    JoergS Administrator

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    You can see some slomo footage of my Liberty here (from 3:55 onwards):<br><br><embed pluginspage="http://www.macromedia.com/go/getflashplayer" src="http://www.youtube.com/v/1aP_gKlQd-s" width="425" height="350" type="application/x-shockwave-flash" wmode="transparent" quality="high" scale="exactfit"></embed><br><br>The bow needs a fairly stiff spine, but the wobbling is not bad.
     

  3. pelleteer

    pelleteer Middle Aged Delinquent

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    The flexing or "wobbling" of the arrow is called paradox. It occurs with all bows, but has a more detrimental effect the further a bow shoots from center. A center shot bow would be like the ones in Joeg's vid above. Longbows shoot at various distances from center (1/8", 3/16", whatever) meaning that the arrow has to bend around the riser section of the bow. It also means the arrow is more subject to breaking or not flying straight if not properly spined. Matching the spine of the arrow to the bow becomes far more important in this case. The same would be true of a rubber-powered bow that doesn't shoot from the center. With a true center shot bow, whether conventional or rubber powered, you can get far more consistent accuracy with a broader range of spines. Obviously, you don't want to shoot an arrow designed for a 20# bow out of an 80# bow, even if the bow is center shot, but within reason, it's less sensitive. <br><br>So...Long story short, if you build a center shot device, whether a wooden slingbow like Joerg's or just a wrist rocket with a whisker biscuit (ala, Dave Canterbury's youtube vids), you should get good accuracy without having to worry too much about "tuning" your arrows to the device.
     
  4. Artifex

    Artifex New Member

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    Ahh, I see. Makes sense. I've owned a number of longbows and I've always wondered how much I could improve accuracy sans paradox. (learned a new word today, thanks Pelleteer. <img src="http://illiweb.com/fa/i/smiles/icon_biggrin.png" alt="Very Happy" longdesc="1">)<br><br>I've got some ideas to strengthen the slingbow... once my thera tube come in the mail I'll post the results. Might work, might not. Gotta try though, right?
     
  5. pelleteer

    pelleteer Middle Aged Delinquent

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    Yep, at least half the fun is trying. I have at least as much fun experimenting with building various designs as I do shooting them. <img src="http://illiweb.com/fa/i/smiles/icon_cool.gif" alt="Cool" longdesc="6"> There's a vid on youtube of somebody shooting overspined and underspined arrows from a longbow. The overspined ones fly at the target with the nock end about 45 degrees to the left of the point, and the underspined ones will fishtail the other way. It's odd to see an arrow in slow-mo flying nearly sideways toward the target. <img src="http://illiweb.com/fa/i/smiles/icon_lol.gif" alt="Laughing" longdesc="7"><br><br>edit: Pffft! I was gonna post a link, but of course I can't find it now...<img src="http://illiweb.com/fa/i/smiles/icon_redface.gif" alt="Embarassed" longdesc="10"><img src="http://illiweb.com/fa/i/smiles/icon_mad.gif" alt="Mad" longdesc="8">