Fortissimo — ORC Rating

GPH

609.6

OSN

594.5

LOA

9.55 m

Displacement

3019 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6909

Medium

0.8918

High

1.0018

Triple Offshore

Low

0.8824

Medium

1.0992

High

1.2228

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: 20.79 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

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.

6,41.9,5.038213,52,5.62,60,5.88,75,6.06,90,5.96,110,5.89,120,5.76,135,5.16,143.5,4.70233,150,4.37
8,39.6,5.78835,52,6.49,60,6.69,75,6.83,90,6.81,110,6.92,120,6.85,135,6.39,147.3,5.68026,150,5.52
10,38.4,6.137604,52,6.86,60,7.06,75,7.25,90,7.28,110,7.49,120,7.48,135,7.18,148.9,6.551694,150,6.48
12,37.8,6.277249,52,7.01,60,7.22,75,7.52,90,7.69,110,7.88,120,8.07,135,7.79,150,7.112955
14,37.5,6.352781,52,7.09,60,7.32,75,7.69,90,8.02,110,8.2,120,8.56,135,8.46,147.8,7.764185,150,7.58
16,37.3,6.411276,52,7.16,60,7.4,75,7.83,90,8.26,110,8.49,120,8.94,135,9.18,145.7,8.509883,150,8.12
20,37.6,6.487526,52,7.24,60,7.51,75,8.05,90,8.61,110,9.05,120,9.66,135,10.79,143.3,10.314606,150,9.54
24,40.1,6.562766,52,7.23,60,7.55,75,8.14,90,8.86,110,9.65,120,10.36,135,12.19,143.2,13.212921,150,12.21

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.62	5.88	6.06	5.96	5.89	5.76	5.16	4.37
8	6.49	6.69	6.83	6.81	6.92	6.85	6.39	5.52
10	6.86	7.06	7.25	7.28	7.49	7.48	7.18	6.48
12	7.01	7.22	7.52	7.69	7.88	8.07	7.79	7.12
14	7.09	7.32	7.69	8.02	8.2	8.56	8.46	7.58
16	7.16	7.4	7.83	8.26	8.49	8.94	9.18	8.12
20	7.24	7.51	8.05	8.61	9.05	9.66	10.79	9.54
24	7.23	7.55	8.14	8.86	9.65	10.36	12.19	12.21

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.9°	3.75	143.5°	3.78
8	39.6°	4.46	147.3°	4.78
10	38.4°	4.81	148.9°	5.61
12	37.8°	4.96	150°	6.16
14	37.5°	5.04	147.8°	6.57
16	37.3°	5.1	145.7°	7.03
20	37.6°	5.14	143.3°	8.27
24	40.1°	5.02	143.2°	10.58

Loading polar chart…