[M_a_t_t]

Originally Posted by JulianEdgar

I actually said "moving from a good standard wheel to one with a full cover I doubt does anything at all". I stand by that. Obviously, a really crappy wheel can be improved on, but here you see people putting full covers on Gen 1 Honda Insight wheels, etc.

I know what you said I quoted it in my post and put it in bold...

So what I am gathering is:
1.If you have an average wheel adding a wheel cover cover can likely improve aerodynamics

Originally Posted by JulianEdgar

Obviously, a really crappy wheel can be improved on.

and


2. If you have an optimized wheel for aero adding wheel covers likely doesn't do anything.

Originally Posted by JulianEdgar

here you see people putting full covers on Gen 1 Honda Insight wheels, etc.

and the second part of the graph above reflects this because most of the area of the 1st gen insight wheels are covered so the reflected change in drag would be smaller and therefore marginal at best.

3. Nothing in aerodynamics is guaranteed and you must test everything.