On a sailboat, why can't there be a roller furling mainsail, similar to a roller furling jib? Seems like the mainsail always need to be hanked on? - Quora
Furling the Mainsail - The Rigging Company
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Mainsail furling systems: an expert guide - Yachting Monthly
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In-Mast or In-Boom Furling Mainsail for a Catamaran? | #1 Catamaran Resource
In-Boom Furling Mains — UK Sailmakers Sweden
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Mainsail mastery - Ocean Navigator
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Is in-boom furling the next big thing in sail handling technology?
Mainsail furling systems: an expert guide - Yachting Monthly