mainsail on boom
A mainsail is a sail rigged on the main mast of a sailing vessel.. on a square rigged vessel, it is the lowest and largest sail on the main mast.; on a fore-and-aft rigged vessel, it is the sail rigged aft of the main mast. the sail's foot is normally attached to a boom. ( in extremely heavy weather, the mainsail may be lowered, and a much smaller trysail hoisted in its place).. Boom furling units are becoming more and more popular on mid-size and larger cruising yachts, where they offer the opportunity to have a fully automated furling system without compromising the sail area or performance of the mainsail. this is because we can build a sail with full-length battens and the same roach profile as we would on a. On the boom, another release line is used to unhook the khr. both lines can be operated remotely - from the cockpit or mast step. to activate the karver khr reef hook, simply haul down on the mainsail to get the reef point close to the hook. pull the hooking control line to guide the hook inside the dyneema strop and haul the mainsail back up. 
mainsail on boom This pulls the bottom of the mainsail down toward the boom. when the sail reaches the desired reef point, secure the halyard and the reefing line, go back on course, and trim the sail. the most basic sailboat rigging is the sloop with one mast, a gaff or a bermudan mainsail, and a single headsail.. Boom vang. if we are sailing upwind on board a normal cruiser, the use of the boom vang is almost non influential. on the contrary, when a boat sails downwind, the boom vang plays a decisive role in controlling the shape of the mainsail since it affects twist according to its position (more twist when it is eased, less twist when hauled) while the sheet determines the orientation of the sail..
