David, I just came across your post about the CAP-21. It just so happens I owned one of the only (Real) CAP-21's in the United States and flew it in contests as well as airshows for many years. It was Ser.# 10 and when I bought it it only had .2 hours test time on it before being shipped to the states. The whole airplane was made of wood including the landing gear legs! The only real difference between the 21 and the 20L/LS (which I flew as well) was the wing. It was call the Ice Cream Cone airfoil as if looked at from the side tipped up on the trailing edge it was shaped like an Ice Cream cone. The main fuel tank only held 40 Liters of fuel (Approx. 10 gals) total! it was plumbed for tip tanks and also had an Aux tank that fit into to headrest area. Going X/C was a challenge to say the least. If you want you can watch the last flight I ever had in the plane on YouTube, I think you will like it..

http://youtu.be/zl5TIR1_ciQ