Aerobats with very low power and wing loading are sometimes refered to as 3D models.

"I am familiar with wing loading which is the wing area in sq. ft. divided by the weight of the airplane in oz." I'm sure you meant weight divided by wing area.

While scale models may turn out heavy, to be able to fly at scale speeds most will require a much lighter wing loading than 40 ounces per square foot. In some scale competition, flying at scale speed is one of the objectives.