www.lewmar.com PART NO. APPROPRIATE CHAIN KIT QUADRANT TYPE SPROCKET SIZE VS TURNS HO/HO FOR 72° RUDDER TRAVEL 5/8" P SPROCKET 3/4" P SPROCKET 5∕8" P 11T 5∕8" P 13T 5∕8" P 15T 3/4" P 11T 89100090 89100093 152mm/6" radius 260° 1.08 0.92 0.79 0.9 89100090 89100093 190mm/7.5" radius 80° 1.35 1.14 1.0 1.12 89100090 89100093 203mm/8" radius 260° 1.44 1.22 1.06 1.2 89100090 89100093 228mm/9" radius 260° 1.62 1.37 1.18 1.35 89100090 89100093 254mm/10" radius 260° 1.8 1.52 1.32 1.5 89100090 89100093 304mm/12" radius 80° 2.2 1.86 1.61 1.8 89100090 89100093 304mm/12" radius 260° 2.2 1.86 1.61 1.8 89100091 89100094 381mm/15" radius 80° 2.71 2.29 1.98 2.25 89100091 89100094 381mm/15" radius 260° 2.71 2.29 1.98 2.25 89100091 89100094 457mm/18" radius 80° 3.25 2.75 2.38 2.7 89100091 89100094 457mm/18" radius 260° 3.25 2.75 2.38 2.7 89100092 89100095 508mm/20" radius 80° 3.61 3.05 2.64 3 89100092 89100095 609mm/24" radius 80° 4.35 3.68 3.19 3.6 89100100 89100096 762mm/30" radius 80° 5.44 4.6 4.0 4.5 PART NO. ANSI SPEC PITCH INCHES BREAKING LOAD kg lb 89100090 ANSI 50 5∕8 2267 5000 89100093 ANSI 60 3∕4 3175 7000 PART NO. CABLE DIAMETER BREAKING LOAD mm in kg lb R19-050 5 0.1 1406 3100 89100078 6 0.2 2040 4500 PART NO. DESCRIPTION 89100069 Conduit (Sold per meter) 89100116 Conduit end fitting Breaking Strength The figures shown in the tables below indicate the minimum breaking load of Lewmar cables and chain. Due to the reduction in strength caused by cable fatigue over time, the load on the cable should never exceed 25% of the breaking strain shown, i.e. Safety Factor = 4. A 305mm/12" radius quadrant used in conjunction with 6mm/0.23" wire is suitable for the rudder torque, as in the example calculation shown on the right. • Precision engineered in non magnetic stainless steel • 2 off master links for easy connection to the cable • Custom length chain sets available on request • Cable supplied in 7 x 19 stainless steel stranded construction • Cable can be supplied to be finished with eyebolts and thimbles • Fully assembled with pre-swaged eyebolts available Torque = Breaking Load x Radius x Safety Factor Metric Example = 2040Kg x 0.305m x 0.25 = 155 mKg Imperial Example = 4500lb x 12" radius x 0.25 = 13500 in.lb The following table illustrates the turns at the helm for a range of standard sprocket and quadrant sizes. Lewmar offer custom quadrants in 6082T6 alloy up to 020 mm (40") Lewmar also offers custom sprockets with any number of teeth in 15.87mm (5/8") or 19.05mm(3/4") or 25.4mm(1") pitch stainless steel or 6082T6 high strength aluminium. Constellation™ Quadrant, Sprocket & Chain Kit Specification Table Wire and Chain assembly Pre-swaged cables can be supplied on request Conduit Non-Magnetic Stainless Steel Roller Chain Assemblies Steering Cable 7 x 19 Stranded Stainless Steel Constellation™ Chain & Wire Accessories
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