Boom vang

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Touch screen diamention: 2.8"~8.4", 10", 10.4", 12.1", 14", 15", 17", 19", 21". With 5-Wire Resistive..And you can see more from Green Laser Pointer Dry Erase Board Aluminum Insect Screen bamboo fencing screen flip down screen Rear View Screen adjustable window screen USB Laser Pointer Wooden Photo Screen On larger sailboats, the boom vang is often a combination of a shock absorber and a rope plus pulley to tighten the system as shown in this picture.A boom vang (US) or kicking strap (UK) is a line or piston system on a sailboat used to exert downward force on the boom and thus control the shape of the sail. An older term is "martingale".The vang typically runs from the base of the mast to a point about a third of the way out the boom. Due to the great force necessary to change the height of the boom while a boat is under sail, a line based boom vang usually includes some sort of a pulley system. Hydraulic piston vangs are used on larger sailboats and controlled by manual or electric hydraulic pumps.The term kicking strap is normally shortened to "kicker" whilst sailing. ie. "Hard on the kicker when we get to the leeward mark"On some sailing boats, such as the 49er, rather than a set of lines pulling the boom downwards, a rigid member is used to push the boom down. As this is the reverse of a vang, it is known as a "gnav".By controlling leech tension, the boom vang is one of the three methods of controlling sail twist.On small sailboats and some cruising sailboats a vang may be omitted. If a vang is not installed, then the sheet has to try to control both horizontal and vertical angles of the boom. When the boom is near the centerline, the sheet is nearly vertical, and can exert downward force on the boom. As the sheet is loosened to increase the horizontal angle of the boom and sail, the sheet becomes horizontal and exerts less downward force. A vang works with the sheet to apply the downward force on the boom at all horizontal angles, allowing the sheet to be used to control the horizontal angle of the boom effectively.While under sail, the opposite force to the vang is supplied by the sail itself. When the sail is furled, a topping lift supplies the upward force on the boom. Some line vang systems incorporate a piston to provide the topping lift force and to damp oscillations. Hydraulic vangs can inherently act in the topping lift role.v?d?eSails, spars and riggingSailsCourse Crab claw Driver Extra Genoa Gennaker Jib Lateen Mainsail Moonsail Royal Skysail Spanker Spinnaker Spritsail Staysail Studding Topgallant Topsail TrysailSail anatomy and materialsClew Foot Head Leech Luff Roach Tack Dacron Technora Kevlar TwaronSparsBoom Bowsprit Dolphin striker Fore-mast Gaff Jackstaff Jigger-mast Jury rig Main-mast Mast Mizzen-mast Truck Spinnaker pole Spreader Topmast YardRigging componentsBackstay Block Boom vang Braces Buntlines Cleat Clevis pin Clewlines Cunningham Downhaul Earing Forestay Gasket Gooseneck Gunter Guy Halyard Outhaul Parrel beads Peak Preventer Ratlines Running rigging Shackle Standing rigging Sheet Shroud Stay mouse Stays Throat Topping lift TrapezeCategories: Sailing vessels and rigging Ship construction Sailboat anatomy Sailing ship elements Nautical termsHidden categories: Articles lacking sources from August 2008 All articles lacking sources(and so on)


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