The wing volume loading (WVL) INHO is much more indicative of how well a model will fly than wing loading is. It will work for all size planes from the little foamys to the giant scale. Jesmos's [planes have a WVL of 9to 10 for the big one and 11 for the smaller one. As he says, a WVL of 11 or more approaches the performance of a lead sled. If less than 9 it becomes a nice flyer, if less than 6 you may have to shoot it down as it will be a floater.