My Kr has the RAF48 airfoil same as the British spitfire from WW2. I can't confirm that but been told that years ago by the designer of the Kr series Mr. Ken Rand. I really do like it's performance for a short /small plane it is a hoot to fly. I learned to fly tail draggers in this plane, self taught which isn't the best way to do it, but for me I had no trouble doing it my first 150 hrs my plane was based on a ranch airport in Wyoming the runway was a 5,000 ft dirt with parriedog holes and a dogleg in the runway to make it interesting.
If I ever would have ran off the runway the sage brush was so high it probably would have tore off my wings. the elevation was over 5,000ft and the runway was a one way run way you took off down hill and landed up hill a couple of miles to the west the terrain rose to over 7,000 ft. My first pavement landing was in Buffalo, Wy. it scared me pretty good no slipping and sliding like it did on the dirt.
The plane is build from wood, foam, and fiberglass. I did all that before computers were common in the home so all I have is old photos of the construction none are on line so I can't share them. If your interested in how one is built from plans only you can do a search for the Kr series one is KR2.net I think.