Boat Plans for the Foils of Your Boat Making the foils on your boat can be a bit hard. You need to have precision. Why use pre-engineered boat plans for fabricating the foils on your boat? There are specifics that are important remember when it comes to the manufacture of the foils of your boat. Here we detail some of those items. When you go to put in the foil on your sail boat the rule of thumb is to remember that the foil should be about four percent. Four percent of what you ask? Well it should take up four percent of your sail area. You must have some of the other details for various structural items accurately in place for the foil to be designed properly. The centerboard should be covered. When you look at your measurements it should look like this. For every square foot that you use on the centerboard would be every forty square feet of what is known as sail area. This can help you to remember accurate measurements for boat plans. Depending on the boat will tell you which boat plan you need for your foil. Each boat is different. It’s just like other parts of the boat will depend on what type you are trying to build. The heavier the boat the lighter the rudder is going to be. However sail boats differ. If it’s a sail boat foil it is said that the foil should be about ten percent of what is known as what would be underwater. As for boat plans, there is something else you need to keep in mind when you are doing the foil. Consider it another rule of thumb. This is that the thickness of the foil should cover a third of the distance from the front edge. When you keep these things in mind and use accurate calculations, you will have the best foil.