A Flying Fifteen (often abbreviated as “FF15” or “F15”) is a type of sailing dinghy, specifically designed for racing. It is a two-person keelboat with a distinctive design that includes a fixed keel, a fractional rig, and a spinnaker. Flying Fifteens are known for their performance and competitiveness in racing, and they are popular in various parts of the world, particularly in the United Kingdom, Australia, and New Zealand.