www.lewmar.com 80Kg 25Kg 50Kg BACKSTAY MAINSHEET TRAVELLER MAINSHEET COARSE TUNE EXTRA PURCHASE FOR MAINSHEET FINE TUNE JIB TRAVELLER VANG CUNNINGHAM Racing dayboat 16:1 cascade 2:1 2:1 4:1 multi-purchase Plunger 8:1 combination 4:1 cascade Small cruiser Fixed 2:1 4:1 multi-purchase – Plunger 4:1 multi-purchase N/A Small racing yacht 16:1 combination 8:1 multi-purchase 6:1 multi-purchase 4:1 multi-purchase 8:1 combination 20:1 combination 4:1 cascade Medium cruiser Fixed 4:1 4:1 N/A 2:1 with plunger 5:1 N/A Medium racing yacht Hydraulic 12:1 combination 2:1 Winched N/A 12:1 combination 36:1 combination 6:1 combination Large cruiser Hydraulic 6:1 4:1 Winched N/A 2:1 with plungers 8:1 4:1 Large racing yacht Hydraulic 2:1 Winched 2:1 Winched N/A 2:1 Winched Hydraulic 6:1 combination 25Kg 100Kg 100Kg 25Kg 4m 1m Which purchase system? Multi-Purchase System ▪ Ideal for mainsheet traveller systems ▪ Provides full range of adjustment Cascade System ▪ Ideal for a vang, backstay or outhaul ▪ Achieves a smaller range of adjustment ▪ Provides high purchase with minimum blocks ▪ Line type and diameter can be specified in line with load on each part of system ▪ Enables control lines to be led to either side of the boat, for example, with a backstay adjustor ▪ All blocks must be free to travel their full working length without danger of catching Technical Reference – Choosing the right purchase system Lewmar manufactures a diverse range of blocks to suit all marine applications. This guide aims to help you to choose the best purchase system and the appropriate Lewmar products to suit your application. Why do we need purchase systems? As a guide, the average person can: • Pull vertically down a force equivalent to their body weight (for a short period) • When fully braced, pull intermittently sideways with one hand to 25kg and with two hands to 50kg • Adjust control lines frequently loaded to 25kg • Exert 15kg single-handed and 25kg double-handed on a winch handle Human force can be multiplied through a purchase system made up of block systems and/or winches, enabling comfortable operation of high-loaded sailboat controls. Some typical systems in use on current boats Cascade Multi-purchase
RkJQdWJsaXNoZXIy MjM2MTk=