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Originally Posted by kingsway
Sounds like a small Kammback might not be sufficient to make all that much difference.
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The smaller it is, the less effect it'll have.
Making it bigger, you come into boat-tail territory
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I did wonder if a 'shelf' jutting out from the top of the rear door (as you see on several cars) might give a sharper cut-off and reduce turbulence at the rear?
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Volvo used 2 very small spoilers on the top of the rear door on its V50 models (MY 2007 on IIRC) - and they keep the rear window cleaner than on the same cars without them.
Rounded surfaces at the rear are not very good - hence you'll see more and more cars with hard ridges built into the rear lights or the bumpers to let the air detach cleanly.
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I lived in sub-Saharan Africa for many years, and a lot of station wagons were fitted with air scoops at the rear to direct air onto the rear screen in order to keep it clear of dust. Can't imagine it did anything to reduce drag though!!
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It'd have needed to be intricately designed and shaped in order to reduce drag - so no.
Though it's possible.