- System 1
- System 2

- System 3
- System 4

- System 5
- System 6

Small Boat:
22 - 28 ft. (6.7 - 8.5 m)

Midrange:
29 - 34 ft. (8.8 - 10.4 m)

Big Boat:
35 - 42 ft. (10.7 - 12.8 m)


1. V-jam. This simple 4:1 self-cleating vang is used on small dinghies.	2. Cascade Vang. The 15:1 Dinghy vang uses a 3:1 cascade inside a 5:1 purchase to create a powerful system. Suites for dinghies and light daysailers with mains to 125 ft2 (11.6 m2).	3. Fiddle. The basic 4:1 fiddle block vang is commonly used on dinghies and small keelboats.
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4. Cascade 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.	5. Cascade Kicker. This rigid rod vang utilizes a simple 4:1 tackle. The rod also serves as a topping lift for the boom. Used on cruising and racing boats.	6. Double-ended Cascade Kicker. Many racers rig the vang with a double-ended control line led down each side of the boat.
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The vangs allows vertical adjustment of the boom, and is an extremely important tool to shape the main for speed. Tension the vang to tighten the leech, flatten the sail and bend the mast. Cruisers use the vang to keep the boom from rising when sailing downwind and abraiding the main.

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Harken Boom Vang Systems

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Pictures and text courtesy of Harken Sailboat Equipment