mainsail without 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).. Again, a mainsail set with the correct amount of twist will have all its telltales streaming neatly aft. a good starting point for most boats when sailing to windward is to tension the mainsheet or vang so that the second batten from the top of the sail is parallel to the boom.. With larger cruising sailboats, manufacturers are increasingly offering in-boom and in-mast reefing and furling systems for mainsails. such systems essentially involve a roller inside the boom or mast with an electric motor that rolls up the sail to reduce its size (reefing) or to stow the sail away after sailing.. 
mainsail without boom In-boom furling mainsails. a furling boom is the way to get the ease of a roller mainsail without having to buy a new mast. several companies make booms that allow a full-batten main to be rolled into the boom. these mains have all the benefits of a standard full-length batten main, yet they can be roller reefed or furled into a specially made. A boom vang is a useful control for your mainsail, especially if it's older and acting its age. that is, if it's getting baggy and difficult to flatten, particularly when you're pointed off the wind. for better performance, you need to be able to pull excess twist out of the mainsail and flatten the leech. the….
