C25 Spinaker
Marc;Does your father inlaw sail by his self, or with other experienced sailors? Has he sailed with a spinaker? have the other people that sail with him sailed with a spinaker? Is his boat rigged for a spinaker? Is he losing races to other boats with spinakers? Does he want a spinaker? Is his C25 a tall rig, or standard? You could fly a spinaker for a standard on the tall, but you might not want to fly a spinaker for a tall on a standard.A spinaker is sized for the boat, so you will need to either talk to a sailmaker, or a store that knows what boat it is for. Or are you really asking, cruising spinaker, or real spinaker?