4:1 mainsheet system with 50 mm blocks and 20 meters of spliced 8 mm Liros Hercules rope
ROPE PURCHASE SYSTEMS
When sailing, there are a wide range of lines and trim systems that must be able to handle the sails optimally. Here, the purchase and aids must be carefully balanced so that one can pull quickly enough and with the right amount of force. When creating a purchase system on a rope, it is like adding gears. Each time you add an extra gear, it becomes easier to pull, but you have to pull a correspondingly longer distance to achieve the same effect as before.
MAINSHEET PURCHASE
A mainsheet is used to control the boom of the mainsail. There are many options for how this can be solved, but on smaller boats, you most often see a so-called triple block at each end. One on the boom and one on the cockpit sole or the traveler in the boat. The bottom one has a cam cleat on it so that the rope can be locked.
OTHER PURCHASE SYSTEMS
Other places where purchase systems are often used can be on the backstay or the boom vang. Here, it again depends on what fittings you have available and what force is required.
