VEHICLE TYPICAL Cd MEASURED Cd
Bicycle rider upright 1.1
Large truck 0.95
“The Block” 0.738
0.682
“Ute” 0.5
“Modern Car” 0.3
Stretched Airship 0.190
0.242
GM Sunraycer 0.12
(Well known experimental solar car)
** Average of CD measured with the model resting on a floor
FURTHER TESTING:
The previous tests were performed with the models on a “stick” well above the floor of
the wind tunnel. This is not an identical situation to a car on the track. The relevance of
results obtained when testing like this have been questioned. The general suggestion
being that drag would increase when the car is on the track. To answer these questions
both models were tested resting on a floor located about ½ way between the floor and
roof of the wind tunnel. The floor was placed here so it was in an area where the airflow
is least effected by the wind tunnel walls.
This is still not exactly the same as a car running on a track but is the best we can do with
the equipment we have.
The BLOCK on wheels ready for testing