There are two weigh ranges

Under 309 and over 309lbs

If you are under 309 you will be using a small sailplan. If you are under 285 you will have to carry weight equal to 1/2 the difference of your weight subtracted from 285.

If you are 309 or up you are allowed to sail the big sail plan, you are always allowed to sail with the small sailplan though. If you are on the big sailplan and your weight it above 309 and under 330 you carry weights equal to half the difference of your weight subtracted from 330lbs. Above 330 you are good to sail with either the small or large sailplan.

Dan