A conventional mast and an in-mast furling mast can look similar from a distance, but the extrusion, mainsail handling system and maintenance requirements are fundamentally different. That matters when identifying a spar, replacing a mast or specifying a new mainsail.
Conventional vs furling mast
Conventional mast
The mainsail is hoisted externally and commonly uses a luff groove, sliders or an external track. Reefing is handled in the sail/boom system rather than by rolling the sail inside the mast.
In-mast furling mast
The mainsail rolls around an internal furling system inside the mast extrusion. The section must accommodate the sail cavity, furling mechanism and associated openings.
More internal mechanism
A furling mast introduces additional bearings, drive components and sail-handling geometry that must remain compatible with the sail and boom arrangement.
Different section families
Seldén distinguishes conventional and furling mast families in its technical information; the correct section and generation should be identified before ordering parts.
Identification
Seldén's sailmaker guide groups older conventional masts mainly as D/E sections and older furling masts as R sections. Later conventional ranges use C sections and later furling ranges use F sections. The individual mast ID should still be used wherever available.
Maintenance differences
Choosing between them
The choice is not simply performance versus convenience. Yacht size, intended sailing, crew requirements, existing boom and deck hardware, sail plan and maintenance expectations all matter. Changing from one system to the other is a rig project rather than a simple extrusion swap.
Considering a replacement mast?
Send us the yacht details, current mast ID and photographs of the mast, boom and sail-handling system so we can identify the correct route.