I'm a builder, and I have found the Sig 1/6 scale clipped wing cub is a lot of fun to build, it's about the same size as a goldberg cub when done (clipped wing version has a scale wingspan, it's a rib bay smaller on each wing than the goldberg cub), but it's a heck of alot lighter and is actually scale, it even builds up similer to the full scale cub (instead of pipes your using balsa sticks. With a .40 to a .48 four stroke, the plane flies nicely. I am not a cub fan, I usually dislike cubs quite a bit.