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Smooth is better but it does not have to be perfect. A small gap is not a big deal but you don't want anything sticking up into the flow. You have a very gradual transition which is more forgiving than an abrupt one.
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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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