Seldén Furling Mainsail Part 1 (4): The principles
1 October 2025 · 4 min · 15K views
What this video covers
In-mast furling systems require specific mast and boom geometry to prevent jamming during operation. Leon Schulz of Regina Sailing recommends setting the boom angle slightly less than 90 degrees relative to the mast, noting that a red mark on the kicker can serve as a consistent reference point.1:54 The mast must remain as straight as possible during the furling process; on fractional rigs, this requires loosening the backstay tensioner to prevent the mast from bending.2:03 When furling, the sail should enter the mast slot at an angle that minimises friction. While some sailors prefer the boom on the port side to reduce the sail's entry angle, vertical battens can offset this advantage by requiring more clearance.3:24 Optimal furling occurs with the wind between 40 and 80 degrees off the bow on either tack.4:26 Proper placement of the furling line's protective donut prevents the knot or shackle from fouling the block at the mast entry.2:33
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