Fortissimo — ORC Rating

GPH

606.9

OSN

591.9

LOA

9.55 m

Displacement

3019 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6941

Medium

0.8953

High

1.006

Triple Offshore

Low

0.8865

Medium

1.1037

High

1.2285

Boat Specifications

Dimensions

Length overall: 9.55 m
Beam: 2.96 m
Draft: 2.1 m
Displacement: 3019 kg
Crew weight: 465 kg
Wetted surface: 20.65 m²

Sails

Mainsail: 34.36 m²
Genoa: 30.24 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 89.03 m²

Design

Type: Grand Surprise 31
Builder: Archambault
Designer: Joubert Nivelt
Year built: 2000
Stability index: 103.7

Velocity Prediction

Polar CSV

Each row is TWS followed by TWA and boat-speed pairs. Paste it directly into WX Navigator or compatible navigation software.

6,41.8,5.057172,52,5.65,60,5.91,75,6.1,90,6,110,5.91,120,5.78,135,5.19,143.9,4.703029,150,4.39
8,39.6,5.814306,52,6.51,60,6.72,75,6.86,90,6.84,110,6.95,120,6.87,135,6.42,147.5,5.691307,150,5.54
10,38.2,6.133432,52,6.87,60,7.08,75,7.27,90,7.31,110,7.52,120,7.51,135,7.2,149.2,6.554439,150,6.51
12,37.6,6.28558,52,7.03,60,7.25,75,7.56,90,7.72,110,7.92,120,8.11,135,7.83,150,7.15,150.1,7.140412
14,37.5,6.390595,52,7.13,60,7.36,75,7.74,90,8.07,110,8.24,120,8.61,135,8.51,147.8,7.811455,150,7.63
16,37.2,6.427882,52,7.19,60,7.44,75,7.88,90,8.31,110,8.54,120,9,135,9.25,145.7,8.570409,150,8.18
20,37.8,6.479741,52,7.24,60,7.53,75,8.06,90,8.64,110,9.11,120,9.75,135,10.9,143.4,10.425782,150,9.66

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.65	5.91	6.1	6	5.91	5.78	5.19	4.39
8	6.51	6.72	6.86	6.84	6.95	6.87	6.42	5.54
10	6.87	7.08	7.27	7.31	7.52	7.51	7.2	6.51
12	7.03	7.25	7.56	7.72	7.92	8.11	7.83	7.15
14	7.13	7.36	7.74	8.07	8.24	8.61	8.51	7.63
16	7.19	7.44	7.88	8.31	8.54	9	9.25	8.18
20	7.24	7.53	8.06	8.64	9.11	9.75	10.9	9.66

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.8°	3.77	143.9°	3.8
8	39.6°	4.48	147.5°	4.8
10	38.2°	4.82	149.2°	5.63
12	37.6°	4.98	150.1°	6.19
14	37.5°	5.07	147.8°	6.61
16	37.2°	5.12	145.7°	7.08
20	37.8°	5.12	143.4°	8.37

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