Much of the FD’s well known power and upwind speed in particular is rightfully attributed to its generous sail area in relation to the boat’s weight. Fairly unique in the world of high performance dinghies is the FD’s use of an overlapping genoa. This feature provides special challenges for the sail designer in trying to achieve optimal shapes. The effective range of sail designs is of course broadened by the adjustability of the rig, but let’s take a look at some special features.