Pedro, my degrees are in the Humanities, I can't read math equations, not even simple ones.

I will write it how I see it:

Wing area in inches times the square root of the wing area in inches divided by 1728.

500 X 22.36 / 1728 = 6.47

Now, divide your weight in ounces by 6.47:

72ozs / 6.47 = 11.13

So, 11.13 is the Wing Cubed Loading.

From what I understand, trainers usually have a WCL of 6 or less and heavy, scale Warbirds are in the 14+ range. A sport aerobatic model should probably be somewhere in-between those extremes.

David