When I developed the rear spoiler on my S10 pickup truck (
see link in signature below) I did it mostly by seat of pants.
However I had a piano hinge connection that started to rust in the process and set up a resistance, and that help set the spoiler angle and height as a result.
I was very concerned with uplift having gone from a short wheelbase Geo Tracker that could spin on black ice to a longer wheelbase but still unsteady mid-sized pickup truck (
quote #15 link).
I assumed ownership of the truck while temporarily driving an hour to and an hour from work. This made highway safety in winter conditions paramount.
With my prior vehicle (
Geo Tracker - Suzuki Sidekick) I was doing mostly short city drives and walking to work so highway safety wasn't so critical.
Most women respond to safety issues,
sell this project as a safety device.
In combination with my other aero-treatments I have a net gain in MPG and Down-Force (
safety).
See post #21
http://forums.pelicanparts.com/off-t...eriment-2.html
Quote:
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"a shallow (20 degree) spoiler as long as 60mm is capable of actually reducing the car’s drag while reducing rear lift or creating modest downforce".
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Additional threads:
Pickup Truck Aerodynamics - CFD Study Chevy S10
https://ecomodder.com/forum/showthre...s10-35043.html