If you are new to Fifteens, or are thinking of buying one, then one of your larger running costs will be your sails. Key to keeping the costs down is managing them as well ashore as you do afloat. If you sail a fifteen for many years, as most of us do, you also tend to build quite a sail collection.
The FF Insight Zone has just released a video on Sail Management and Care. You can find it in the Members area of the BIFFA website. Go to the website home page and click on UK Association/Members/FF Insight Zone. You need to login with your members password first.