18 ST FS Self-Tailing Manual Single Speed Winch - Full Stainl

18 ST FS Self-Tailing Manual Single Speed W" - Full Stainless Power Rib ANDERSEN W"es feature the Power Rib . Unlike other w"es with abrasive drum surfaces, ANDERSEN w" drums have vertical ribs running up the surface. This combined with the smooth polished stainless steel gives a maximum grip and minimum wear on ropes, reducing the replacements costs of sheets and halyards. What s more, the Power Rib principle simply makes sailing more pleasurable. Fewer turns on the w" make tacking easier. Sheets can be gently eased out without harsh snatching and the risks of overrides and jammed sheets are significantly reduced. The grip provided by the ribs will remain the same year after year, unlike many other w"es with an abrasive or sandpaper-like surface. Such surfaces have a tendency to wear down both ropes and themselves. Power Ratio Power Ratio is the mechanical advantage of the w" and is calculated as follows: length of handle x gear ratio radius of drum The pull of the w" is based on the Power Ratio and not just on the physical size of the w" or the diameter of the drum. The Power Ratio is used to determine the load the w" may handle as follows: pull of handle (kg x Power Ratio = pull of w" (kg). This means that by applying a load of 10kg, using a 10" standard handle, on a Power Ratio 40:1 w", the w" can pull 400kg, assuming that the w" is 100% efficient. This is not possible in practice as the efficiency is reduced by internal mechanical friction losses. Specifications: Drum D: 2-3/4" Base B: 4-3/4" Height H: 5-1/4" Line Entry L: 1-15/16" Line Size: 1/8-11/16" Weight: 7.0lb Gear ratio 1st speed: 2.6 : 1 Power ratio 1st speed: 18.8 :1