Quote:
Originally Posted by aerohead
It doesn't matter how the elongation and taper is executed,but the trailing edge must to be continuous and airtight,wrapping all the way around as Kamm has done,or as with a sealed box-cavity.Any 'hole',anywhere, will allow lower pressure are to bleed into the space and adulterate the pressure increase you're trying for,netting low to zero gain.It's not negotiable.
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This piece of advice is useful to me as have thought I could add a "virtual" boat tail by extending the roof only with a void underneath it..
If I ever was to mod my beetle I would cut it down to the desired boat tail shape. My roof is exceptionally high I would cut it down to blend it into the rear hatch similar to the karmann Ghia's roof line.