Quote:
Originally Posted by aerohead
Try and stay away from any spoiler which produces anything close to a 28-degree angle when measured projecting up and forward,grazing the backlight or it's header.
This 28-degree angle has been found to create flow which is be extremely unstable.The wake behind the Echo will jump between a square-back and fastback type wake,playing hell with the drag.
And limit your up-kick angle (if you use it) to no more than 30-degrees.
CAR and DRIVER Magazine investigated spoilers back in the 1970s and found that drag increased when their spoilers exceeded the 30-degree mark.
Good luck!
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Duly noted ! Many thanks !