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Originally Posted by CobraBall
If the K-car you are talking about is the 1978 Pontiac Firebird Wagon, IMHO it is a "truncated hatchback" which is different from a "Kamm Back".
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This is Kamm's K car:
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0.37CD is the same as the Volkswagen Tiguan (SUV).
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That may be, but the Tiguan is a modern, detail-optimized shape. Compare Kamm's work to contemporary vehicles and his accomplishment is more evident. Give him a Tiguan, and he'd improve its rear design and lower its Cd too.
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IMHO if the Kamm Back was the answer to an aero rear end design, then high speed bicycle and gravity racers would use a Kamm back in lieu of a tear-drop design.
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Nobody has suggested that a complete tear drop shape isn't more efficient.
The Kamm back
is the answer to good aero design in
production vehicles where (a) it's not practical to extend the vehicle's lines to the ultimate teardrop end, and/or (b) where consumers would likely reject a full or near-full tear drop as too radical. HPV's, gravity racers and solar cars don't face either of those constraints.