morkys -
Here's the explanation of the source of my image :
Quote:
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The VERA-01 is a prototype vehicle developed by Peugeot in 1981. Compared with the production 305's Cd of 0.44, VERA's 0.318 represents an improvement of nearly 30%. Here we use the VERA as an example in which aerodynamic improvements were made using smoke streaks, citing the effectiveness of the measures taken.
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Therefore, this is a circa-1981 test done in wind tunnel. Covering the wheels was just one modification that they made.
CarloSW2