|
Kingsway,
It isn't a dumb question and we are all new to this...even those of us with years of involvement since there is still a lot to know.
The coast down test I would think is more due to momentum and vehicular weight than aero drag but an easy way to test is another test from say 70 to 50 and see if the trend follows or deviates from that you have already found.
Just an aside...some makers here (Australia) use "vanes" (curved metal plates attached to the wagon at the rear corners and roof) to alter airflow.
The idea is to keep the rear window clear of dust in the country but there is no reason why you cold not adapt the same mechanics to alter the aero of your VW.
Peter.
|