Thanks for the cg info Bill. Actually my cg is 12.2 cm (4.8") from leading edge and it is close to the revised figure of 12.5 cm. I can say that this must be the right one as it flies inverted hands off, no mix required for the perfect knife edge flight, and when it comes to landings it almost flares and touches the ground hands off!
Tianci,
The power of YS63s is just right for this plane. But mine is 5.5 pounds with mini servos and cf landing gear. It has unlimited verticals with 14*4 and hovers one or two clicks above half throttle, It is very stable in all 3D maneuvers, harriers (very little wing rock), torque rolls, harrier rolls. It is just amazing, it flies like big planes (in fact it performs 3d better than my DA50 powered GP Patty Wagstaff). As far as I know saito 82 has the same power with YS 63s, but if your 72 revs an apc 14*4W around 9600-700 it will be more than enough.