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'folding'
In 2014, 'folding' the mirrors on Spirit lowered the overall drag, and not allowing for reduced frontal area indicated a change, from Cd 0.267, to Cd 0.255.
Removing the mirrors indicated Cd 0.244, when not normalized to actual frontal area. There again though, overall drag was reduced.
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And we'd probably want to avoid generalizations, limiting discussion to vehicle-specific observations.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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