I fly all sizes of models from the little 1/2A to the 1/4 scale and have found that the WVL factor relates very well, much better than wing loading, to determine what type of performance a model will give. You can check this out yourself quite easily, just plug in some of the different planes you fly and note where they fall on the chart in one of the above comments. You will find that anything with a WVL of less than 7 is a real floater while anything above a WVL of 12 starts to approach the performance of a lead sled. If you have flown both the 1/2 A and the 1/4 scale, you will see that the 1/4 scale with a wing loading in the high 20's or even 30 ounces per square foot fly rather nicely but a 1/2 A with that wing loading will not fly at all.