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Re: Handshock

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  • L.J. Sparvero
    Fritz, That is the best explanation of handshock that I ve seen in a long time, thank you very much for sharing it! The only minor comment I d make is the
    Message 1 of 1 , Dec 30, 2002
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      That is the best explanation of handshock that I've seen in a long
      time, thank you very much for sharing it! The only minor comment I'd make
      is the observation that the speed that a bow can throw an arrow can never
      be greater than the speed that the ends of the limbs and string is going
      forward at launch (naturally). So if you get two bows with the same string
      length, fistmele, and draw weight, but one has big and heavy limbs
      (especially near the ends) and the other is svelte, the skinny bow will be
      able to snap back its limbs faster on release, launching an arrow faster.
      This is also why a human can't throw an arrow nearly as fast as a
      bow can launch it. When you think about it, the energy given to an arrow
      that is either thrown or launched off a bow comes from the same source --
      the archer's muscle power. The difference is that a bow transfers all the
      energy to the arrow in a short impulse and flings the arrow quickly, while
      the human arm can only move forward in a throwing motion just so fast. As
      an example, if someone is throwing a fastball at 90mph, their hand is going
      forward at that speed at the instant of release.

      -Lyev Davidovitch, AEthelmearc

      At 02:05 PM 12/30/2002 +0000, SCA-Archery@yahoogroups.com wrote:
      >If the bow is strong but heavy and slow, it needs a heavy projectile to
      >throw. If the arrow is not heavy enough, it can not take the bow's
      >energy away with it.
      >A 500gr arrow will only carry a certain amount of energy at say 100 fps.
      >If the bow's top speed is 100 fps and it supplies more energy than the
      >500gr arrow will take away, the rest of the energy will reverberate
      >within the bow and come out as sound and handshock. It's part-way to
      >dry-firing the bow. For an extreme case imagine using a crossbow bolt as
      >a projectile in a ballista. Bad idea.
      >On the other hand, it may well be that the slow bow can also propel a
      >1000gr arrow at 100 fps, now the arrow is taking away twice the energy
      >(F=MA) leaving far less to bounce around in the bow and create handshock.
      >I have a 70+ Osage orange D-section longbow that is not very fast. It
      >_Hurts_ to shoot conventional arrows with it. But, shoot a 3/8" shaft
      >with a 1 1/2 oz bodkin head on it, and it is a joyous and pleasant bow
      >to shoot. (retrieving such arrows is a whole other subject)
      >For greatest handshock reduction, whatever your bow, shoot the heaviest
      >arrow that doesn't slow it down (much).
      >Hmmm... could also be the tillering of the bow, I've had (and made) bows
      >that turned the handle slightly as they were drawn. That kind of motion
      >can raise a blister in short order.
      >- Fritz
      >Carl West eisen@... http://eisen.home.attbi.com
      >I have no superfluous leisure; my stay must be stolen out
      >of other affairs; but I will attend you awhile.
      > - Isabella, Measure for Measure, Act 3 Scene 1
      >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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