RE: UCD 60 knife edge advice please!
Out of four UCD .60s I've found that on each one the wing incidence was off in relation to the previous one. All were on the positive side which I don't believe would contribute to diving to the wheels. Had more of a tendency to balloon up. I did a drastic mod for roll coupling and removed about 30 sq. in. off the rudder, top and back. Roll coupling solved as the rudder had too much mass above the longitudal center line. As Airbike-RCU mentioned, I too feel that the tendency to dive to the wheels is in the horizontal stab being placed too high. On the UCD .46 it is lower and does not suffer from this. My CG is @ 5-5/8 and require 35% on elv. to stop the dive. Joe