Actually

Superwing = 63 mm by 150 mm (about 2.5 inch by 6 inches) has elliptical leading egde, is relatively flexible RATIO = 2.4
standard = about 85 mm by 150 mm (Like F18 masts) has a circular leading edge, is relatively stiff. RATIO =1.75

With respect to weights a standard alu mast of 8.5 mtr length on the FX-one weights about 20 kg (44 lbs) fully fitted while the same mastlength superwing on the F16's weights about 16 kg (= 35 lbs) fully fitted.

The philosophy behind the superwing mast is different from the standard mast and they need to be sailed differently. If you do that then you enter a zone of low drag high speed sailing.

As Phill says the Italians pioneered this type of mast in the 80's; the Aussies perfected it.

It is also my personal opinion that there is no better alu mast available on the market today. It is a tough puppy to beat even with carbon masts.

Wouter