In conclusion there is a difference in drag when tested on “a stick” and “on the track”, but
these tests results indicate there may not always an increase. Caution is required and in
fact the testing of your car is the only certain way of getting accurate drag figures.
Using the air drag coefficients obtained above for the cars on a floor in the mathematical
simulation the following predictions were obtained.
AIR DRAG RACE TIME DISTANCE DIFFERENCE
COEFFICIENT SECONDS METRES
1 LAP 2 LAPS 1 LAP 2 LAPS
0.0114 20.2 34.1
0.0042 19.05 31.3 8 23
Approximate distance this car is ahead at the end of the race due only to the lower aerodynamic drag.