Ball bearings between center hub and deck bearing, and main shaft reduce friction; drum and halyard swivel turn freely under load.
Harken MKIV Underdeck Unit 2
Harken’s MKIV Underdeck Jib Reefing & Furling line is the perfect solution for sailors who want an aerodynamic system with a minimal amount of equipment above deck. The underdeck furler provides a low-friction, clean layout solution that minimizes windage, while uncluttering the bow for easy anchor access. Tack sits at deck level, lowering the tack height for maximized sail area. Through-deck bearing into underdeck compartment provides a low profile, nearly watertight system. Typical Boat Length 10.6 - 14.2 m (35' - 46')
Low-friction efficiency for easy furling and reefing
Designed for easy installation
Torque tube fits over existing turnbuckle allowing easy length adjustment. Hub assembly toggle accepts standard turnbuckle using swage, rod, Norseman, or STA-LOK® terminals.
Belowdeck drum fits narrow bows
Outside drum diameter is small.
Improved sail shape and boat control
Independent halyard and tack swivels furl sail center before head and tack for improved sail shape when reefed. Lightweight aluminum halyard swivel saves weight aloft to reduce pitching and heeling.
Fast hoists, douses, reefs, and sail changes
Hardened stainless steel ball bearings and inner race for maximum strength-to-weight ratio.