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Antennas and open-frame structures

   Open frames

   Single frame.   Two-dimensional.   Normal wind   

at high solidity, frame acts as a solid plate  (Lecture 8)

at low solidity, members act as individual elements

intermediate solidity :  aerodynamic interference between members CD 1.6

2.0

1.0

0.5

1.0

0

Solidity ratio,

CD

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