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TECH CORNER BOOM VANGS   SHOP NOW     Boom vangs allow vertical adjustment of the boom. Tensioning the vang tightens the leech of the sail. Cruising sailors use the vang to keep the boom from rising downwind, while racing sailors use the vang as a primary shaping device for the main. Typical boat length: Small Boat: 22' - 28' (6.7 - 8.5 m) Midrange: 29' - 34' (8.8 - 10.4 m) Big Boat: 35' - 42' (10.7 - 12.8 m) Small Boat Mid- range Big Boat HARKEN PART NUMBER 4:1 V-Jam A 226 — — B 245 — — 15:1 Cascaded Vang A 447 — — B 445 — — C 405 — — D 407 — — 4:1 Fiddle A 2655 2621 2621 1559 B 2658 2624 2624 1564 8:1 Cascaded Fiddle A 098 183 300 304 308 B 2655 2621 2621 1559 C 2658 2624 2624 1564 4:1 Cascaded Kicker A 2655 2655 2621 2621 1559 B 2658 2658 2624 2624 1564 6:1 Double-ended Cascaded Kicker A 344 2640 2640 2604 2604 B 342 2638 2638 2602 2602 C 349 2652 2652 2600 2600 D 241 241 240 240         4:1 V-Jam: This simple 4:1 self-cleating vang is used on small dinghies.   15:1 Cascaded Vang: The 15:1 Dinghy Vang uses a 3:1 cascade inside a 5:1 purchase. The cleat pivots side-to-side so it is easy to cleat, even while hiked out. It also angles up and down to accommodate different mounting heights. Suited for dinghies and light daysailers with mains to 115 ft2 .           4:1 Fiddle : The basic fiddle block vang is the most common system.   8:1 Cascaded Fiddle: A doubling block increases the purchase of the vang to 8:1. The load on the fiddle blocks is halved so they can be used safely on larger boats.           4:1 Cascaded Kicker: Rigid rod vang with a simple 4:1 tackle. The rod also serves as a topping lift for the boom.   6:1 Double-ended Cascaded Kicker: Most rigid rod vangs include a self-cleating adjuster tackle. Many boats find it useful to re-rig the vang with a double-ended control line led down each side of the boat.