First, I want to say thank you to all that are contributing to this thread. Second, I have not been a strong proponent of the KF airfoil. Not that I disbelieve its value, I know it is valid, but I just have not had a need for it yet. Third, I am here to learn, so please pardon any probing questions. As it was stated near the start of this thread "In God we trust! All others bring data" LOL
A special thank you for Davereap for the video demo. That was very telling.
I am interested in how the KF compares to conventional non-stepped airfoils.