I have a Balsa USA Stringray 120 with a Ryobi 31cc engine that flys the plane very nicely. It has an 84" wing span with 1276 sq in wing area and weighs in at 14lbs. If your RV6 comes even close to these dimensions I think you'll have loads of fun with it.

Good Luck.

Here is a PIC of my Stingray 120.