Blackwatch
USA CustomSail number USA/USA71
GPH
515
OSN
502.7
LOA
20.684 m
Displacement
33167 kg
Triple-Number Ratings
Lower is fasterTriple Inshore
Low
0.8136
Medium
1.0606
High
1.2191
Triple Offshore
Low
1.0394
Medium
1.3029
High
1.4437
Boat Specifications
Dimensions
- Length overall
- 20.684 m
- Beam
- 4.43 m
- Draft
- 3.83 m
- Displacement
- 33167 kg
- Crew weight
- 1330 kg
- Wetted surface
- 74.95 m²
Sails
- Mainsail
- 108.11 m²
- Genoa
- 151.01 m²
- Spinnaker
- 300.25 m²
- Asymmetric spinnaker
- 301.31 m²
Design
- Type
- Custom
- Builder
- Nevins
- Designer
- S&S
- Year built
- 1938
- Stability index
- 162.5
Velocity Prediction
| Wind Speed | 52° | 60° | 75° | 90° | 110° | 120° | 135° | 150° |
|---|---|---|---|---|---|---|---|---|
| 6 | 6.76 | 7.06 | 7.25 | 7.11 | 6.72 | 6.6 | 6.01 | 5.08 |
| 8 | 7.76 | 8.02 | 8.17 | 8.08 | 8 | 7.9 | 7.35 | 6.28 |
| 10 | 8.3 | 8.54 | 8.68 | 8.71 | 8.75 | 8.7 | 8.33 | 7.37 |
| 12 | 8.6 | 8.83 | 9 | 9.09 | 9.19 | 9.18 | 8.94 | 8.25 |
| 14 | 8.79 | 9.01 | 9.21 | 9.36 | 9.42 | 9.53 | 9.35 | 8.82 |
| 16 | 8.91 | 9.13 | 9.36 | 9.56 | 9.59 | 9.8 | 9.69 | 9.23 |
| 20 | 9.07 | 9.27 | 9.54 | 9.82 | 9.89 | 10.14 | 10.32 | 9.87 |
| Wind Speed | Beat Angle | Beat VMG | Run Angle | Run VMG |
|---|---|---|---|---|
| 6 | 41.4° | 4.54 | 143.3° | 4.4 |
| 8 | 39.4° | 5.32 | 146° | 5.44 |
| 10 | 38.4° | 5.78 | 146.6° | 6.38 |
| 12 | 37.6° | 6.08 | 152° | 7.16 |
| 14 | 37° | 6.27 | 156.9° | 7.77 |
| 16 | 36.4° | 6.42 | 163.1° | 8.29 |
| 20 | 35.8° | 6.61 | 176.6° | 9.14 |
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