Fortissimo — ORC Rating

GPH

604.4

OSN

589.6

LOA

9.55 m

Displacement

3019 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6941

Medium

0.9006

High

1.0132

Triple Offshore

Low

0.8905

Medium

1.1083

High

1.2359

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.

6,42.4,4.983375,52,5.58,60,5.9,75,6.16,90,6.11,110,6.02,120,5.87,135,5.27,143.8,4.795775,150,4.46
8,40.8,5.878506,52,6.56,60,6.77,75,6.91,90,6.92,110,7.03,120,6.96,135,6.54,146.4,5.846891,150,5.62
10,39,6.227916,52,6.9,60,7.09,75,7.28,90,7.33,110,7.55,120,7.53,135,7.22,149.6,6.631779,150,6.61
12,38.1,6.366472,52,7.03,60,7.24,75,7.56,90,7.73,110,7.93,120,8.15,135,7.81,150,7.18,151.4,7.09581
14,37.6,6.424418,52,7.11,60,7.32,75,7.74,90,8.12,110,8.27,120,8.66,135,8.54,147.5,7.813691,150,7.6
16,37.5,6.453619,52,7.14,60,7.38,75,7.86,90,8.41,110,8.6,120,9.09,135,9.39,145.3,8.64812,150,8.21
20,37.5,6.541852,52,7.26,60,7.53,75,8,90,8.7,110,9.35,120,9.91,135,11.14,143,10.743324,150,9.91

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.58	5.9	6.16	6.11	6.02	5.87	5.27	4.46
8	6.56	6.77	6.91	6.92	7.03	6.96	6.54	5.62
10	6.9	7.09	7.28	7.33	7.55	7.53	7.22	6.61
12	7.03	7.24	7.56	7.73	7.93	8.15	7.81	7.18
14	7.11	7.32	7.74	8.12	8.27	8.66	8.54	7.6
16	7.14	7.38	7.86	8.41	8.6	9.09	9.39	8.21
20	7.26	7.53	8	8.7	9.35	9.91	11.14	9.91

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.4°	3.68	143.8°	3.87
8	40.8°	4.45	146.4°	4.87
10	39°	4.84	149.6°	5.72
12	38.1°	5.01	151.4°	6.23
14	37.6°	5.09	147.5°	6.59
16	37.5°	5.12	145.3°	7.11
20	37.5°	5.19	143°	8.58

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