Hello, don't know if I should start a new thread or not, seeing as this is exactly the subject that's been bugging me for a bit : louvers.
And specifically louvers on a '79 Scirocco that I've owned for 12 years now (now I use it once a month).
I find it a very interesting case study in aerodynamics for the simple fact that it's sister model ,the vw Golf, in spite of the fact that it has a steeper and taller windscreen it has a lower Cd 0.38 vs the Scirocco's 0.42
It's all down to that rear hatch angle , on the golf the air detaches at the roof, and the sciroccos hatch is basically a huge vortex generator
So the question is: would louvers that bring the hatch angle from 25-26(not sure about this) ,as it is now, to 15-20 make a difference in Cd?
I've attached 2 pics of example louvers that don't follow the hatch angle.