This young man did a wind tunnel test on a flat foam airfoil, a traditional airfoil and a KF step. The flat airfoil performed poorly all around (no surprise), while the KF produced more drag than the standard airfoil, BUT... the KF step also produced more lift.
In a subsequent video he tests a flat airfoil and three KF airfoils on the same plane. The results are fascinating. Powers RC did the same thing with park jets.
Worth a look.
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