the sword undulations

Discussion in 'Surfing' started by Guest, Jun 8, 2010.

  1. Guest

    Guest Guest

    Long wide blades which are swung fast inevitably experience times when they stall during quick redirections, this can be felt and it definitely slows the blade down and reduces control. The ability of a blade to handle an increase in the angle of attack of 30% is a big advantage as the blade will turn much more quickly. It will also help to reduce the speed inefficiency caused by misalignment during a cut.

    This won't be felt anywhere near as much with narrow more thrust orientated blades, nor will it be noticed as much in dealing with a single opponent, when compared with the more continuous circular movements required for control of a 360 degree area.

    Wide thin cutting blades are just like wings with very low chord ratios in that they only accept a narrow range of angles of attack. Wide cutting blades have very low chord ratios around 6 percent, making high speed maneuverabilty a definite issue.

    In broad terms the undulations can increase overall efficiency by up to 20 percent, that's a huge increase and would not only be felt in increased speed and maneuverability but also as less of an energy drain on the wielder of the sword, which could be significant during long battles.

    The fact that the sword undulations have rounded sine curve like tips rather than pointed serrations also points to aerodynamic efficiency as the goal rather than the 'bread knife' cutting effect sometimes put forward as their reason for being.

    By the way it's also the case that blades with spatulate tips generate much less tip drag than pointed blades. Tip vorteces contribute a large proportion of the overall drag produced by a wing.

    So, in addition to giving the sword a longer cutting reach, the spatulate tip reduces drag and thus increases blade speed. This is even more the case because the tip is the part of the blade which is travelling the fastest and thus produces proportionally the most aerodynamic drag.

    As has been noted countless times by RMA practictioners and ARMA scholars, sword makers were far more knowledgable than
    has been commonly supposed in recent times, and in my opinion the undulating blades are another example of their enlightened creativity and practicality.
     
  2. Roy Stewart

    Roy Stewart Active Member

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    Oct 1, 2004
    New Zealand
  3. kiwi

    kiwi Well-Known Member

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    Aug 28, 2007
    geez Robinson your forum whore:D;)

    how do you find the time to make boards:?:p
     
  4. Guest

    Guest Guest

    Roy Stewart wrote:
    :D

    i was wandering what you had been up to.

    i can imagine you having some dojo set up in your workshop with sword quivers and straw dummies, a video camera and some kind of classical opera music going , loud.
     
  5. Guest

    Guest Guest

    .... if so , please post up some video.
     
  6. applekat

    applekat Well-Known Member

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    Jul 31, 2007
    undulating....swords...wielding...percentages....thrusts n' cuts...

    DAMMIT SMUKES WHERE THE HELL ARE YOU?!!:shock::D:D:D
     
  7. log donkey

    log donkey Member

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    Sep 8, 2004
    USA California
    http://www.youtube.com/watch?v=LAW996cR0Ms
     
  8. SMUKES

    SMUKES Active Member

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    Jun 23, 2009
    USA California
    I'm right here, oh I'm right here... The more we learn of RS, the more the sketches are filled in with detail and color and the shapes of Roy are shaded and lit by his own hand... THE f#%kIN RADDER THIS GUY COMES OUT. Roy Stewart, you my friend are one interesting dude. Salute.

    And as Logdonkey has pointed out ...

    Roy is, METAL.
     
  9. applekat

    applekat Well-Known Member

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    Jul 31, 2007
    smukes: "...and the shapes of Roy are shaded and lit by his own hand..."

    -------------------

    not lit....smukes...forged....FORGED.
     
  10. Roy Stewart

    Roy Stewart Active Member

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    Oct 1, 2004
    New Zealand
    Some things are just too interesting :cool:
     

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