Since you're wanting to find ounces per square foot, you need to figure out the plane's weight in ounces and the advertised wing area in square feet. I went with 9 lbs because it's very close to the weight listed in the original post and a round number. 9 lbs x 16 ozs = 144 ozs. Since the plane's wing area is given in sq. inches, you have to divide by sq. inches in order to find the number of sq. ft. 12 inches x 12 inches (which is 1 sq. ft.) = 144 square inches ... so ... 972 sq. inches / 144 sq. inches = 6.75 sq. ft. of wing area. To find the wingloading (ounces per square foot) ... 144 ozs. / 6.75 sq. ft. = 21.33 ozs per sq. ft.

Dan