8. Hardware 286/287 A B C 25Kg 200Kg 100Kg 50Kg BOAT SIZE 4m/13ft 6m/20ft 8m/26ft 10m/33ft 12m/39ft 14m/45ft 16m/53ft Mainsheet – Hand 3:1 4:1 4:1 5:1–10:1 8:1– 24:1 – – Mainsheet – Winched – – – 3:1 4:1 4:1 4:1 Vang – Cruising 4:1 4:1 4:1 6:1 8:1 10:1 10:1 Vang Racing 5:1 6:1 8:1 12:1 24:1 36:1 48:1 Car tow – Cruising – – 2:1 2:1 2:1 3:1 3:1 Car tow – Racing – 2:1 3:1 6:1 10:1 2:1 2:1 (winch) (winch) WINCH SIZE 30 40 45 50 55 One handed input – 15 Kg on handle = Winch output load 450kg 600kg 660kg 720kg – Two handed input – 25 Kg on handle = Winch output load – – 1100kg 1200kg 1350kg = 200kg 25kg 8:1 = = = Combination Cascade/Multi-Purpose System • Achieves compromise between power and range requirements • Ideal for use on backstay, jib, and mainsheet controls How much purchase power is needed? To identify the amount of purchase power required, carry out the following calculation: The table gives some examples of typical purchases used by Lewmar customers. Winched purchases To identify the amount of purchase power required in winched purchase, first calculate the winch output: The table suggests the pulling power that can be generated. Coarse/Fine Tune System • Coarse purchase ideal for racing mainsheet systems • Used for moving large amounts of unloaded mainsheet during mark rounding • Combination fine purchase perfect for playing the mainsheet when beating Reverse Purchase • Ideal for an asymmetric pole launch system • Offers fast movement and a greater range on lightly-loaded systems • Cleat is located on control line, which is loaded to twice the pole launch rope Output Force Input from Control Line/Winch Purchase Required Output Force Winch Output Purchase Required x 15kg (single-handed operation) x 25kg (double-handed operation) Winch Output Winch Model Number Typical purchase systems Typical winch output loads 48:1 cascade on Backstay Resultant 20:1 Cam block 5:1 Coarse System 4:1 Fine Tune System 4:1 purchase on Mainsheet 2m to Pole Cleat 1m 8:1 combi on Jib system
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