Backstay adjusters change headstay tension, which in turn adjusts a hanked on genoa to suit the wind conditions. Loosening the headstay tension fills the genoa for maximum drive in light airs, and tightening the headstay tension flattens the genoa for stronger wind conditions. Most furling genoas requires a tight headstay for proper performance, but in port the tension can be relieved by adjusting the backstay.
STYLES
Each style has advantages the sailor needs to consider for the load and ease of use.
- Hydraulic units may be self-contained or remote panel styles, both with a gauge for repeat settings and relief valve to prevent over-tensioning.
- Ratcheting units are next best where physical strength of the crew is a consideration.
- Block & Tackle systems depend on purchase for adjustment.
- Wheels generally have a lower breaking strength load than ratcheting style systems.
MAXIMUM PRESSURE ADJUSTMENT
As a general rule, the maximum pressure applied to a backstay adjuster shouldn’t exceed 25% of the breaking strength of the wire.
|
Type 304 (1/19 Stainless) |
Type 304 (7/19 Stainless) |
Type 316 (1/19 Stainless) |
Wire Size |
Breaking Strength (lbs.) |
3/32" |
1,150 |
920 |
1,150 |
5/32" |
3,300 |
2,400 |
3,000 |
3/16" |
4,700 |
3,700 |
4,400 |
7/32" |
6,300 |
|
5,600 |
1/ 4" |
8,200 |
6,400 |
7,300 |
9/32" |
10,300 |
|
9,400 |
5/16" |
12,500 |
9,000 |
10,600 |
3/8" |
17,600 |
12,000 |
16,000 |
7/16" |
23,400 |
|
21,500 |
1/ 2" |
29,700 |
|
27,500 |
9/16" |
37,000 |
|
33,000 |
INSTALLATION
Installing backstay adjusters requires cutting the backstay and resizing it to incorporate the adjuster into the length of the backstay. Some skill at rigging is necessary for this installation with a mechanical stay fitting otherwise the backstay will need to be taken to a shop to be re-swaged. The toolbox will vary depending on the chosen adjuster.
Toolbox:
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