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Don't give up on it. You may have coincidentally filled up with winter gas. The angle looks fine to my eyes. I had my kamm at a steeper angle and still got attached flow according to the tuft testing.
I also had problems with intermittent sticking brakes which drove me crazy before I fixed them, then all the benefits of my work became apparent.
Mainly, cold weather hit just as you finished so you would probably be getting worse mileage than baseline without it anyhow.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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