Quote:
Originally Posted by freebeard
Do you have figures for the Type III Notchback/Fastback/Squareback?
One could remove the trunk lid from the Notchback and fabricobble an enclosed and raised lid like the Jetta, from the cut-off end of a Squareback roof. It could fit against the stock glass like the cowl induction hood on a Camaro.
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I've only got a blueprint for the fastback, and I'm uncertain of its actual Cd. I've seen Cd 0.50 attributed to it. Hucho shows a very small image for the notchback, used as a wind tunnel calibration model, but it's useless when photo-enlarged.
If a modification, in any way changes the relative length of the aft-body, in relation to the length of the car, the new 'roofline' contour would have to be based upon the new relationship.
The Golf/ Rabbit has an active aft-body length of 16.25%.
To create the Jetta, it gets a little over ten ( 10 ) inches added length, increasing the aft-body percentage to 33.43%.
And not so oddly enough, both the Golf and Jetta hit their drag minimums when their aft-body contour passes through the Mair' boat-tail transition / 'slow' template pathway.