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Old 01-16-2012, 02:57 PM   #31 (permalink)
COcyclist
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Location: NW Colo
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TDi - '04 VW Golf
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Quote:
Originally Posted by aerohead View Post
* with respect to the 1971-1974 Citroen SM,I only have a brief article about one that owner Jerry Hathaway ran at Bonneville at 154 mph on an estimated 250 bhp.There is a photo of the car from the side.Under the 'Template' it appears that the flow is compromised at the very top of the backlight,with the rear slope going to 26-degrees (Ford Pinto,Datsun 240 Z). The flow should separate right there with no hope of re-attachment.It's just too steep.
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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Quote:
Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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