[aerohead]

Originally Posted by freebeard

I think no-one did it better than Caroll Shelby.


st.automobilemag.com/uploads/sites/11/2015/07/Shelby-Cobra-Daytona-Coupe-50th-Anniversary-rear-side-view.jpg


Google fails me ....again.

Maybe aerohead will recall, there was an engineer at the Zepplin Works, a contemporary of Jaray, whose name is appartently not Fasenfeld/Fashenfeld/Faschenfeld, that was the original proponent.

One minute delta. [waves at aerohead]

* What is shown on Peter Brock's Shelby Cobra Daytona Coupe is simply a rear spoiler, which was introduced by Richie Ginter, at the 1961, 24-Hours of Le Mans, on the Team Ferrari entries, which he drove for. Ginter was a US Air Force guy, and was applying what he'd seen on military aircraft ( ailerons, flaps, slats, slots, etc..).
* Wolfgang Klemperer was a PhD candidate at the Zeppelin Werke, who conducted the wind tunnel tests for Paul Jaray, on the car models, and would go on to receive his doctorate in 1927, remaining at Zeppelin, then Goodyear-Zeppelin Corporation. I'm unsure about Klemperer and spoilers.
* Jaray invented the 'low nose, the 'ideal nose', the 'streamlined car', 'wheel skirts', the 'belly pan', the 'diffuser', the cambered , zero-lift underbody.
* Fachsenfeld invented the truncated tail, the 'splitter, ' racing wings, maybe more which escape me.
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The rear spoiler re-accelerates the flow, lowers the pressure to 'non-adverse' condition, allows re-attachment, pressure recovery, higher base pressure reduced pressure drag, reduced induced lift.
A kammback is better, but would add mass, alter the polar moment of inertia, reduce the power-to-weight ratio, reduce acceleration, and diminish the handling of a race car.
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By the way, Brock's tearing edge on his rear spoiler comes up 'exactly' to the AST-III.