The NACRA F17 Rules have been derived from the NACRA Inter 20/Inter 18/Inter 17R Rules. The key modifications are that the larger spinnaker is allowed for skippers 210# and larger, that weight of skipper without adding weight have been set at 180# for the small spinnaker and 230# for the larger spinnaker, that weight adjustments are set at half of the difference between skipper weight and minimum (a chart is provided), that a new profile and length of daggerboard is permitted based on NACRA provided template (I'm still waiting on the template), and that the new NACRA F18 rudderblade is permitted.