I've flown my 3 year old Vendetta at Cg's of 3 3/4 to 4 inches. 3 7/8" is my current setup. First flights were at 3 3/4", no issues. I did experience one tip stall during landing with the CG at 4" One slight bounce/flair/tip stall/cart wheel. This runway gymnastic event occured during a moderate crosswind condition. Plane seems to be quite "happy" at 3 7/8".

Where do you fly Q-40's in the bay area?

Tom