The
Formula 18 class, abbreviated
F18, is a formula-design sport
catamaran class. It was started in the early 1990s and quickly grew to a full-sized
International Sailing Federation recognised class, with large racing fleets all over the globe. Before the turn of the century, the F18 class was attracting up to 150 boats and crews to their world championships. Since then, a limit has been placed on attendance (max 150), and therefore qualifier rounds for the world championships are held worldwide.