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Old 01-12-2005, 10:59 AM   #2
Scooby Newbie
Member#: 59889
Join Date: Apr 2004
Chapter/Region: MAIC
Location: Baltimore, MD

I measured my STi wing as carefully as I could, and then used the LARC wing simulator to calculate the downforce. I assumed the following parameters:

Thickness: 25% of chord (2.0 in)
Camber: -6.5% of chord (-0.5 in)
Chord: 8 inches
Span: 4 feet
Angle of attack: -1.2 degrees
Altitude: sea level

These seem to be the best match to the STi, as well as I could do with just a tape measure. I assumed that the angle of attack was the angle of the top of the wing end plates. I measued this angle with geometry, not a level, so the angle of the car on the ground did not effect the measurement.

The calculated downforce is 60 lb at 100mph. At 150 mph, the downforce is 140 lb. These are increases in download on the rear axle of about 5% and 10%, assuming 60-40 f/r weight distribution. These are the numbers for the top wing only, not the deck lid spoiler, which will add a little more. These numbers are not insignificant.
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