Quote:
Originally Posted by COcyclist
Thanks for your additions.
Looking at the Citroen aerodynamics article from a few posts earlier, they mention lowering drag and lift by adding a rear "aerofoil" (spoiler) beneath the rear window on the CX. This reminds me of the Crisis Fighter Pinto with its rear spoiler to improve drag on its too steep back glass.
If Ken tuft tested the back glass on his SM wouldn't the tufts show turbulent flow?
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I have an article at home for the CX.I want to say that is is by L.J.K.Setright,who road tested the car in Europe.He reported Cd 0.27 for the car,the lowest Cd of any production car of its time.At WOT the car seemed to accelerate for ever,finally topping out in the 120-130 mph region on fairly low horsepower.I don't remember about a rear spoiler,but I do recall that the backlight was configured such that rainwater would be channeled down the center,leaving very good rear vision.
With respect to the SM,I think that Hucho would predict attachment down the centerline of the backlight,but attached longitudinal vortices on the C-pillars.Anything over 23-degrees (Hucho) [22-degrees(Mair)] would be considered a pseudo-Jaray 'fastback',notorious for vortices and their drag.
And it might take smoke to discern the vortices,as they would be 'flying' a bit above the bodywork and might not show with tufts.