are you sure about the 9.10 mtr mast ?

That seems almost impossible with a total sail area of 16.25 sq. mtr.

Let me explain where I see a problem.

nacra F16 rig => 8.5 mtr maxt , 8.1 mtr luff and distance between beams 1.97 mtr.

total mainsail area 15 sq. mtr.


Now take a 0.6 mtr taller mast and therefore 0.6 mtr more luff length. Additionally, the spacing between the beams is increase by some 0.15 mtr. Both these elements place the new mainsail area at 15 + 0.6 * 2.12 + 1.5 * 8.6*0.075 = 17.24 sq.mtr. where is is assumed that both rig have a squaretop of the same percentage.

This is off course logical as a 9.1 mtr tall mast is what the F18's have combined with a very similar spacing between the beams.