Saito 125 with a bunch of mods to acommodate the larger engine. Throttle servo moved back to where the rudder servo goes, rudder servo moved back to the tail opposite the elevator servo. Balsa tray added behind wing bolts to mount battery further back. It flys hands off inverted without adding any weight to balance. I think Im at 3.75 in back for CG. Right now I have a 16x4 APC on it, I need to switch back to the 16x6 wood prop. My dry weight is 7.3 lbs.