After reading all the horror posts on the CMPRO lancair, I decided to increase the wingspan 9" to tame the horrible tip stall tendency. I added a 9" section in the center of the wing made out of high density foam, covered with 1/16 balsa and a 9" longer aluminum tube. Also had to modify the main landing gear so it won`t be 9" wider apart. Will post pictures nexts week and send a test fly report after the first flight. It is such a beautiful aircraft that it deserves the extra effort.