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Harken 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
 
Vang system 1
 
Vang system 2
    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 .
    Vang system 3   Vang system 4
    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.
    Vang system 5   Vang system 6
    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.