Mike, as stated above, the GP Eagle is short coupled (distance from CG to tail), it seems GP favored scale outline over flight performance. The plane has heavy pitch AND roll to rudder coupling, which makes knife-edge and point rolls challenging. Can a good pilot make it perform? Sure, but I was working the sticks a LOT harder than with my others planes just to keep it on the intended flight line.

I have flown extensively 3 other biplane designs including the 1/4 scale Dave Patrick designed Cermark Pitts S2B and Goldberg Bucker. Though one size smaller (designed for 120 2-strokes) both these planes flew far better than the GP Eagle.