I would wager that MOST Funtanas DO have "heavy right sides" (not necessarily the wings) if they have side mounted motors. In a side mounted motor with the cylinder head sticking out the right side of the fuse, the right side will be heavier unless steps are taken to balance the weight of the offset motor. A pattern flyer will always laterally balance his plane after the installation is complete to avoid problems like these.

But it is interesting that Marcos said it rolls right even from inverted pullouts, which negates my suggestion anyway (because if the right side were heavy, it should roll left when the pullout is made (this should be a "push" or down elevator to climb out from inverted).

Note, "pulls" on the elevator (up elevator) will cause right roll with a right heavy plane always, regardless of attitude. I assume that's what Marcos means when he said sometimes the left side is heavy, is because in the first case he pulls "up elevator" and the second case (left heavy) he's actually pushing "down elevator." The attitude of the plane has nothing to do with this phenomena -- only the G forces induced by the elevator.

I do agree that they are fun to fly though. Once I spent the time to mix out (nearly all) of the bad habits, it flys as well as it looks.