Quote:
Originally Posted by oldtamiyaphile
Hucho says Opel saved 0.003CD by cutting a ~930mm section from the centre of the Calibra airdam. Drag increased either side of this.
Hucho doesn't seem to go into detail as to the hows and whys of this.
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A guess would be that the sides are acting as 'spats',limiting air access to the tires and hour-glass belly openings.
I don't have any specific data.
The other thing is that when you enter a driveway from the street at an angle,the reduced center height of the airdam may protect it from a ground strike when going over the vertical apex of the driveway ramp.A practical concession.