P6
"As expected fully covered wheel shows good results, but as it can
be seen thick outer radial cover actually performs better throughout all velocity range"
P8 conclusions:
"..rims with large outer radial cover were known to perform well in terms of aerodynamic drag force. They have been proven to be good in regards ventilation resistance as well. Moreover having a rim with thick outer radius cover was proven to be more efficient then having a fully covered wheel."
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