LINE SELECTION GUIDE 45 MAIN 8.5 13.5 16 18.5 23.5 37.5 50 67 GENOA/JIB 9 16.5 25 33.5 42 58.5 71 83.5 SPINNAKER 37.5 46 54.5 71 92 117 150.5 184 OVERALL YACHT LENGTH (M) 10M 11M 12M 6-8M 9M 14M 16M 18M MOORING ROPES 10M 11M 12M 6-8M 9M 14M 16M 18M ANCHOR WARPS, PAINTER LINES 10M 11M 12M 6-8M 9M 14M 16M 18M MAIN 8 10 10 10 12 12 14 16 GENOA/JIB 8 10 10 12 12 14 16 18 SPINNAKER 8 8 8 101012 1416 SPINNAKER/GUY 8 8 10101214 1618 MAIN 10 10 12 12 14 14 18 20 GENOA/JIB 10 10 12 12 14 14 18 20 SPINNAKER 8 8 10101212 14 16 SAIL AREA SQ.M. (APPROX) SHEET SIZE DIAMETER (MM) HALYARD SIZE DIAMETER (MM) DISPLACEMENTTONNES 2 4 5 6.5 8 111220 POLYESTER LINE (MM) 8-10 12 12 14 14 16 18 24 DISPLACEMENTTONNES 2 4 5 6.5 8 111220 POLYESTER LINE (MM) 12 14 16 16 18 20 20 24 USE ONE SIZE DOWN FROM THE SIZES DETAILED in this chart when specifying ropes with Dyneema® cores The guide below, details diameters per application for the average cruiser/racer based on polyester ropes such as Marlowbraid or Doublebraid. From a performance perspective strength and stretch are most important and the higher strength to weight ratio of ropes with Dyneema means that at least one size smaller can be used e.g. An 8mm or 10mm D2 Racing can be used instead of 12mm Marlowbraid. However, when choosing any line, it is important to achieve a balance between performance and the ability to handle the line effectively – if the rope is too thin, the crew may find it more difficult to hold on to and your existing deck gear may struggle to work with it. RETAINED STRENGTH SPLICED ROPE KNOTTED ROPE FIGURE 8 LOOP BOWLINE ROUND TURN 2 HALF HITCHES DOUBLEBRAID MARLOWBRAID D2 D12 TERMINATIONS SPLICES: Most Marlow ropes can be spliced, this is normally the preferred method of termination. A good splice using the recommended method should not reduce the strength of a rope by more than 10%. KNOTS: A knot will reduce the strength of the rope, sometimes very significantly. This loss is caused by the tight bends and compression found in any knot. The amount a rope will be weakened will depend on the knot, type of rope and the material from which it is made but can be up to 60%. EYE SIZES: Wherever possible, the angle formed at the throat of a splice when it is loaded should be 30 degrees or less. This means that the length of the eye when flat must be at least 2.7 times the diameter of the object over which the eye is to be used and the distance from the bearing point to the throat when in use should be at least 2.4 times the diameter. Some materials like Aramids and HMPEs will require a larger eye with an angle at the throat of 15 degrees or less.
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