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Antennas and open-frame structures

   Open frames

   Single frame.   Two-dimensional.   Normal wind  

  sharp-edged members

   reference area for drag coefficient = ‘solid’ area of frame

2.0

1.0

0.5

1.0

0

Solidity ratio,

CD

    solidity = ‘solid’ area of frame/total enclosed area

drag coefficient relatively independent of details of member arrangement

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