What are roof scoops for.
Purpose of a roof scoop.
The main reason for having a roof scoop on a rally car is to actually pressurise the interior of the car slightly.
This small increase in pressure works wonders to keep out dust and sand from the rally stage.
If the car was a rear engined air cooled engine car like an old vw bug it could be used to force cooling air over the motor.
This is because there s a negative pressure created by the vacuum bubble behind the trunk.
In almost every case a large naca duct will provide more than sufficient airflow without increasing drag raising the boundary air thickness or causing turbulent airflow.
I explain the basics of how the airflow works around.
On a rally race car a small roof scoop creates positive pressure in the cabin pushing dust out of window.
I have no idea what good a roof scoop could do.
The only other reasons for a roof scoop are to cool rear mounted heat exchangers radiators or to provide intake air for a rear or mid mounted engine.
Any dust floating around the cabin will seriously inpeed the driver s vision and make it much harder for the co d.
Also on mid engined cars the roof scoop is the air intake.
It cools off an appropriate spot when you start to get hot headed.
Anyone has idea.