The Ins and Outs of In-Mast Furling Mainsails
What is an in-mast furling mainsail?
Unlike a traditional mainsail that is hoisted and doused vertically with a halyard, an in-mast furling mainsail wraps around a tube inside a hollow mast. It is unfurled by an outhaul line and furled back in with a line labelled as the "inhaul."