Quote:
Originally Posted by JulianEdgar
I am talking about modifying real cars, not theorising about shapes. A rear spoiler on a fastback shape can reduce drag and lift: refer to Page 304, Aerodynamics of Road Vehicles, 5th edition.
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1) okay, 'real' cars.
2) The VW XL1 is a 'real car.' The VW XL1 is a 'fastback. It has an AST-II roofline, zero separation over the roof, and the lowest Cd of any extant production car. According to VW, with the governor defeated, the car will do 112-mph. No spoiler.
3) The Porsche Cayman is a 'pseudo-Jaray' fastback, it suffers flow separation over its roof and requires a rear spoiler, not only for direct downforce, but also to correct lift-due-to separation. Like the Taycan, also a fastback. Hyundai Prophecy concept car, ditto.
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Whether a rear spoiler can reduce drag and lift has never been a bone of contention.
Going back to Hucho, simply lofting the vehicle's rear profile to where you'd terminate an add-on spoiler, would in all likelihood, produce even more favorable results.