The only advantage that I can see to make the changes suggested is if the airplane was going to be a dedicated high altitude flyer. This suggested set up would eliminate the situation Mark L is describing of having his plane nose up at high altitude.
The problem is that based on what I am hearing and have experienced in my own KR2, you will LOSE all the other good traits of the design. Look at Mark L's description of what happened when the builder (the name escapes me) that used a different airfoil in an effort to make the KR2 faster, which became the poster plane for the KR2S. Landings became very different as I expect the stalls did also. Plane was not kept for to much longer there after. Mark L has a great documentation of the new airfoil on his site. Use it as is, or else build the old RAF48 airfoil. I would hate for you to end up with an unpredictable stall, or nasty low speed characteristics! Colin N96TA
