The Gennaker
The gennaker has been around for several decades now, and as the name suggests it is a hybrid between a genoa and an asymmetrical spinnaker. A brand name of North Sails, the gennaker is a cruising sail based on the Code 0 spinnakers used on racing boats. Gennakers and similar code 0 variants offered by other makers are even larger than genoas (200% overlaps are not uncommon) and they have a much greater camber for generating larger amounts of lift when reaching. Flat cut gennakers can be effective for angles as low as 60–70 degrees. Spinnakers perform much better when running because the main sail blocks the wind of gennaker above 135–150 degrees.
Read more about this topic: Genoa (sail)