How do you explain the centuries old examples of such craft via your theory?
***One step at a time. Start with original eyewitness accounts, meet the threshold of 10 for a flap, run it through the prism of Occham’s Razor (what is this really, most likely?) and then look for distinctive confirming evidence if you can find it. Starting from the 1947 flaps (which are coincidentally 2 years after WWII ends and the aeronautical experiments have begun) and look at it with a rational perspective.
I understand your SOP.
What I was hoping for was an answer that made more sense.
Though, I confess, I was skeptical I’d get one.