http://www.schrs.com/

in specific : http://www.schrs.com/schrsmeasurement.asp?id=main

Best is too devide trapezium S1 into 2 triangles. This is more accurate.

Also for F16 rules you only need to include the mast area that is next to the mainsail. So you can deduct the area of the mast that is below the foot of the sail. (or below the gooseneck)

Also the area of the boom is NOT included in the F16 mainsail area.

Paul, do you currently have a Taipan 4.9 mainsail or a F16 mainsail ?

The Taipan 4.9 mainsails are a little smaller than the F16 mainsails so you should indeed be a little below 15 sq. mtr. If you are way below that number then you probably forgot to include the mast area = about 1.4 sq. mtr. on teh Taipans (10 %)


Wouter