[kafer65]

If I were to taper the back of my Jetta sedan at the ten degrees and then terminate it kamback style, what would be a good distance to measure back from the decklid to stop. I figure I'm tapering about 2 inches in for every foot I go back and the narrowist point of the car is 4 feet wide. It would take more than ten feet to fully taper if it was straight and not elliptical. If it were to be elliptical what formula could I use to get a good long axis oval taper? It would be constructed with coroplast.