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GroundSpan Factor

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  • dave santos
    The kite arch method gives major gains in AWES scalablity and control compared to what single-anchorpoint kites can do. To quantify this factor for formal
    Message 1 of 3 , Nov 24, 2012
      The kite arch method gives major gains in AWES scalablity and control compared to what single-anchorpoint kites can do. To quantify this factor for formal prediction of flight parameters, a mathematical definition is needed.

      GroundSpan is proposed as the missing extent term. Let it be defined as the measured distance between two or more kite anchorpoints, or, in its dimensionless version, the ratio of GroundSpan-to-Height of a Kite (arch).

      GroundSpan is intended to compliment WingSpan in specifying the overall "AirFrame" of an AWES, which typically includes  a surface media (land or sea).

      ===============

      Notes-

      GS/H = ~2 makes a reasonable kite arch at any scale. 

      A control bar or the simple spread of one's arms, with a multiline kite, introduces a GS >0, with a tangible effect on stability and control.

      CrossWind Factor (span orthogonality to wind direction) is a related existing term. A lot of our concepts are skewed off the crosswind plane. Static-to-swept ratio crosswind. 


    • Joe Faust
      Discussion point for groundspan 1000/1=1000 ? http://energykitesystems.net/images/kitesystems/groundspan2.jpg
      Message 2 of 3 , Nov 24, 2012
        Discussion point for "groundspan"
        1000/1=1000   ?
        http://energykitesystems.net/images/kitesystems/groundspan2.jpg
      • dave santos
        In different flight modes and windspeeds, there is a favored balance of goundspan to height. Joe presents an interesting case of a GS/H of 1000 (or infinity,
        Message 3 of 3 , Nov 24, 2012
          In different flight modes and windspeeds, there is a favored balance of goundspan to height. Joe presents an interesting case of a GS/H of 1000 (or infinity, when the kite is on the ground), which looks like a typical parked AWES geometry. Then, by letting the arch rise to altitude at a lower GS/H, the stability factor would reduce in proportion to allow a self-initiated harmonic power mode. In ligher winds the arch could rise yet higher up the wind gradient into less marginal wind and oscillate more sensitively still with more sweep.




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