Roller furling has pushed headsail piston-hanking headsails to the brink of extinction. But it also results in a significant loss in light-air efficiency. Meanwhile, genoas, drifters and reachers have become orphans without a stay on which to hank. A new generation of light-air roller-furling sails aims to resolve these issues. They require no fixed stay and, on a properly equipped boat, they can be set, furled, doused, and dropped with relative ease. Practical Sailor reviews seven roller-furling systems for light-air sails, including models from Bamar, CDI, Colligo, Facnor, Harken, Karver and Schaefer. …