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Originally Posted by aerohead
1) shame Hucho didn't include that data point in his handling of the Langenburg Castle car. It would also have been of benefit had you mentioned it.
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He
does include this data point:
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The K3 is now on display at Langenburg Castle (Germany). Measurements on this car, made in the large wind tunnel of Volkswagen AG, resulted in cD = 0.37. Not too bad a figure, but much worse than the one Kamm published: from coast-down tests he concluded cD = 0.24.
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And the reference, again:
Hucho, W.H. "Introduction to Automobile Aerodynamics." In
Aerodynamics of Road Vehicles, 4th edition, W.H. Hucho, ed. [Warrendale: SAE, 1998], 30.
This answers freebeard's question too: the Langenburg car is Kamm's third car of 1938-39.