Recording optimal sail settings
Every mainsail has certain trim adjustments and settings that seem to make it go as fast as possible. Whenever you feel like you're going fast, notice how you have the sail trimmed. Your ultimate goal is to create a reference chart for each of your mains that will give you good target settings for each variable. See below for an example:
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|
Mainsail
|
Light Air
|
Medium
|
Heavy Air
|
|
Wind Range (knots apparent)
|
 |
 |
 |
|
Top Batten (angle to boom)
|
 |
 |
 |
|
Outhaul (inches from band)
|
 |
 |
 |
|
Cunningham
|
 |
 |
 |
|
Depth (% at mid stripe)
|
 |
 |
 |
|
Draft Position (% at mid)
|
 |
 |
 |
|
Backstay Tension (% of max)
|
 |
 |
 |
|
Boom Position
|
 |
 |
 |
|
Battens
|
 |
 |
 |
|
Rudder Angle
|
 |
 |
 |
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Mainsail trim Card
Make a copy of the chart above for your mainsail. Then set a goal to keep track of your fast settings and fill in the chart as shown below. Each time you race, review the chart of the main you are using before the start. This will give you good starting adjustments. Change the numbers in your chart(s) as you discover faster settings. (Remember settings will differ widely between boats.)
|
MainsailÂ
North K/M 98
|
Light Air
|
Medium
|
Heavy Air
|
|
Wind Range (knots apparent)
|
 Â
|
  Â
|
  Â
|
|
Top Batten (angle to boom)
|
Parallel
|
Parallel
|
Slightly Open
|
|
Outhaul (inches from band)
|
2"
|
Max
|
Max
|
|
Cunningham
|
None
|
Little
|
Hard
|
|
Depth (% at mid stripe)
|
Â
|
Â
|
Â
|
|
Draft Position (% at mid)
|
Â
|
Â
|
Â
|
|
Backstay Tension (% of max)
|
Â
|
Â
|
Â
|
|
Boom Position
|
Centreline
|
Centreline
|
Traveller Eased
|
|
Battens
|
Soft Top 2
|
Soft Top 1
|
Stiff
|
|
Rudder Angle
|
3º
|
4º
|
5º
|
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