There are lots of them kicking around in basements and garages. Your good old boat probably came with one. It’s the dreaded old-fashioned symmetric spinnaker, the tri-radial.
Most non-racers believe that these sails are too much work, too hard to master, and too dangerous to use when out for a day sail with the kids. I’d like you to think again – the spinnaker can be tamed, and could be the most fun for the dollar you have ever found.!