Quote:
Originally Posted by 2000mc
The spoiler also raises and extends my deck lid, which ends with a much smaller radius than the rounded naked trunk lid. So whether or not I made a recirculating bubble on top of the trunk, the greater effect could be from how the spoiler effects the bubble behind the car. The effect behind the car might be positive enough that if I produced a negative effect on top of the trunk, the net result is still positive... I figure it could be very potentially misleading without tufting the whole back of the car and filming from a chase vehicle, which we can do the next time you're in Kansas
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*I think your intuition was dead on!
*The outboard portions of the spoiler were creating a solution to a problem you didn't have.My guess,a styling concession so as not to scare consumers with 'expectations' of what a spoiler ought to look like.
*Cutting off the ends reduced induced lift (drag).
*The center section guarantees reattachment behind the backlight.
*And it locks in the vortex.
*The air flowing over the vortex decelerates as it travels lower and to the rear,building pressure until the end of the spoiler.
*When the flow does separate at the spoilers edge,it's at a much higher pressure which raises the base pressure of the wake,cutting pressure drag,exactly as Hucho predicts.
You did good! Good thinking!
