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5.5 Storm Loading<br />
5.5.1 Drag force on blade<br />
<strong>Blade</strong>s parked. Extreme wind speed<br />
1 2<br />
FD ( r)<br />
ρVmaxCD<br />
c(<br />
r)<br />
2<br />
= load per unit length<br />
V max<br />
V max = 50 m/s, c = 1.3m<br />
ρV c<br />
Re = max =<br />
μ<br />
Hence C D =<br />
c<br />
F D<br />
Fig 28<br />
26
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