A CLASS CATAMARAN TUNING GUIDE
MAST |
UPWIND |
DOWNWIND |
||||||
| WIND SPEED (Knots) | SPREADER RAKE | PREBEND | CUNNIGHAM | BATTENS (Top 4 battens) | MAST ROTATION | CUNNIGHAM | MAST ROTATION | TRAVELER (off the center line if foiling) |
|
5-8 |
42 mm |
20 mm |
OFF |
Light |
45-50 degrees |
OFF |
80 degrees if foiling |
180 mm |
|
8 - 12 |
56 mm |
27 mm |
15 - 40% |
Light Medium (10+ kts) |
35-45 degrees |
10 - 25% |
70 degrees |
220 mm |
|
12 - 16 |
60 mm |
32 mm |
100% |
Medium |
25 - 30 degrees |
60 - 75% |
65 degrees |
300 - 400 mm |
|
16 - 20 |
75 mm |
38 mm |
100% |
Medium |
20 - 25 degrees |
80% |
80 degrees |
500 mm |
|
20 - 24 |
90 mm |
42 mm |
100% |
Heavy |
20 - 25 degrees |
80% |
80 degrees |
500 mm (Hang on!) |
For best performance, a lighter skipper will slide the settings up the range one, and a heavier skipper will stay down the range one setting. (70kg is light; 90kg is heavy.) The Mainsheet should be tensioned enough to have an even twist profile from top to bottom, and all tell tails should fly evenly.
