I agree with Todd. This isn't rocket science. What's so hard to figure out? US Sailing has a Portsmouth Rating for just about any catamaran you're going to run into. There is a rating for that boat. Use the modification factors to alter the rating. If you want to know what an Aqua Cat rates with a Hooter, double traps and a skipper and crew that weigh 500 lbs. you can come up with a rating using the modification factors. When all else fails, read the directions.