Yachting line selection Posted on December 9, 2012 by jimvintner 1 Rope Line Selection KEY Racing Cruising Not Suitable Racing and cruising yachts D2 Racing 75 D2 Competition V2 Racing D12 Doublebraid Marlowbraid Mattbraid Dinghies, sports boats and windsurfing Excel Elite 78 Excel Racing 75 Excel Pro Excel Fusion 75 Excel Gemini Excel D12 Excel D12 Max 78 Excel V12 Excel Control Excel PS12 Excel Taper Excel Vectran Excel Marstron Formuline 8 Plait Pre-Stretched 8 Plait Matt Diameter selection Guide (Monohull) The diameters are based upon polyester ropes and working loads of 20%-35% of published break load. Ropes with Dyneema ® and Vectran ® cores allow downsizing and the use of smaller diameters. Boat Sheets Halyards Length Main Genoa / Jib Spinnaker Spin. Guy Main / Jib Genoa Spinnaker 6-8m 20-26 ft 8mm 8mm 8mm 8mm 10mm 10mm 8mm 8-9m 26-30 ft 10mm 10mm 8mm 8mm 10mm 10mm 8mm 9-10m 30-33 ft 10mm 10mm 8mm 10mm 12mm 12mm 10mm 10-11m 33-36 ft 10mm 12mm 10mm 10mm 12mm 12mm 10mm 11-12m 36-40 ft 12mm 12mm 10mm 12mm 14mm 14mm 12mm 12-14m 40-46 ft 12mm 14mm 12mm 14mm 14mm 14mm 12mm 14-16m 46-53 ft 14mm 16mm 14mm 16mm 16mm 16mm 14mm 16-18m 53-59 ft 16mm 18mm 16mm 18mm 18mm 18mm 16mm