I ran across something I’ve never seen before, what I can best describe as a slotted split flap. I saw a plane that looked like a Tailwind W10, but metal wing and bigger. Nothing special there, but the flaps where airfoil shaped with hinge axis well forward of flap leading edge and flush with bottom of wing. So flap rotates down opening a slot, but doesn’t translates back like a normal slotted flap since the hinge axis isn’t below the wing. The typical aileron torque tube found on Tailwinds was there in front of the retracted flap leading edge. Anybody see a flap like this? Any data on how it performs?