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I believe the Corbin Sparrow is fiberglass, and the dimples are placed as boundary layer turbulators where they might do a bit of good to fix the shape. It would be easier than more extensive mold mods.
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I can't tell from your post, do you think they are cosmetic or, they help lower the overall drag and they are just easier to add than say, vortex generators?
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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.