Small Boat underdeck furling units are ideal for sportboats
and daysailers from 16 to 30 ft (4.8 m to 9 m). The drum
is located beneath the deck, lowering the tack height for
maximized sail area. The single through-deck ball joint
provides a low-profile, nearly watertight system that aligns
the spool to the headstay. Like all Small Boat furlers, the
underdeck furler is for furling only, not reefing.