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Originally Posted by sgtlethargic
What's the year, make, model, and CdA of this lovely looking car?
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The caption with the photo on Hucho's website identifies it as "1936 Adler Autobahn"; no drag coefficient is given. That photo is also reproduced in the book, on page 25 of the 4th edition, simply as "a car with typical 'pseudo-Jaray-back.'" The paragraph referencing that image says,
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As the wool-tuft picture in Fig. 1.29 shows, the flow in the mid-plane of the slope remained attached over a long distance. However, the hopes placed in that seemingly smooth flow pattern were not fulfilled. As was discovered much later (see Section 4.4.5), two distinct longitudinal vortices were produced on both sides of the slope. These vortices induced not only a strong downwash between them keeping the flow in the car's longitudinal midsection attached, they induced also a high negative pressure on the slope and this produced very high drag.
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This passage backs up JulianEdgar's empirical results of pressure-testing on the Insight I; if the flow was remaining attached only because of vortex downwash, you could expect to find high negative pressure there. IIRC from the images, with no spoiler the Insight saw a gradual pressure rise to -25 Pa from ambient at the trailing edge (please correct me if I'm misremembering).