NUR: ORC Rating

GPH

680.9

OSN

659.8

LOA

9.61 m

Displacement

3747 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5826

Medium

0.8011

High

0.94

Triple Offshore

Low

0.756

Medium

1.0001

High

1.1393

Boat Specifications

Dimensions

Length overall: 9.61 m
Beam: 3.21 m
Draft: 1.94 m
Displacement: 3747 kg
Crew weight: 581 kg
Wetted surface: 21.95 m²

Sails

Mainsail: 23.75 m²
Genoa: 25.95 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 59.22 m²

Design

Type: First 31.7
Builder: Beneteau
Designer: Finot
Year built: 1998

Performance data

Polar CSV

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

6,43.5,4.204725,52,4.7,60,4.99,75,5.21,90,5.16,110,5.17,120,4.98,135,4.45,145.5,3.955705,150,3.77
8,42.4,5.037542,52,5.63,60,5.93,75,6.17,90,6.24,110,6.29,120,6.08,135,5.52,147,4.936384,150,4.78
10,41.2,5.621898,52,6.29,60,6.53,75,6.71,90,6.87,110,6.91,120,6.79,135,6.4,146.8,5.820038,150,5.62
12,39.8,6.065469,52,6.68,60,6.85,75,7,90,7.22,110,7.29,120,7.2,135,6.92,147.8,6.44061,150,6.3
14,38.2,6.247957,52,6.89,60,7.06,75,7.24,90,7.5,110,7.69,120,7.59,135,7.28,150,6.73,174,5.882223
16,37.9,6.33646,52,6.99,60,7.2,75,7.46,90,7.66,110,8.12,120,8.03,135,7.67,150,7.04,176,6.445701
20,38.2,6.349757,52,7.03,60,7.27,75,7.75,90,8.09,110,8.8,120,9.01,135,8.57,150,7.63,178,7.134346

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.7	4.99	5.21	5.16	5.17	4.98	4.45	3.77
8	5.63	5.93	6.17	6.24	6.29	6.08	5.52	4.78
10	6.29	6.53	6.71	6.87	6.91	6.79	6.4	5.62
12	6.68	6.85	7	7.22	7.29	7.2	6.92	6.3
14	6.89	7.06	7.24	7.5	7.69	7.59	7.28	6.73
16	6.99	7.2	7.46	7.66	8.12	8.03	7.67	7.04
20	7.03	7.27	7.75	8.09	8.8	9.01	8.57	7.63

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.5°	3.05	145.5°	3.26
8	42.4°	3.72	147°	4.14
10	41.2°	4.23	146.8°	4.87
12	39.8°	4.66	147.8°	5.45
14	38.2°	4.91	174°	5.85
16	37.9°	5	176°	6.43
20	38.2°	4.99	178°	7.13

VPP POLAR · BOAT SPEED BY TWAKT

TRUE WIND ANGLE —

READ AT ANGLE

Hover or tap the chart, or use the slider, to read boat speeds.

True wind speed 6 kt8 kt10 kt12 kt14 kt16 kt20 kt

Data table

Boat speed by true wind angle and true wind speed
TWA	Boat speed in 6 kt (kt)	Boat speed in 8 kt (kt)	Boat speed in 10 kt (kt)	Boat speed in 12 kt (kt)	Boat speed in 14 kt (kt)	Boat speed in 16 kt (kt)	Boat speed in 20 kt (kt)
0°	0.00	0.00	0.00	0.00	0.00	0.00	0.00
52°	4.70	5.63	6.29	6.68	6.89	6.99	7.03
60°	4.99	5.93	6.53	6.85	7.06	7.20	7.27
75°	5.21	6.17	6.71	7.00	7.24	7.46	7.75
90°	5.16	6.24	6.87	7.22	7.50	7.66	8.09
110°	5.17	6.29	6.91	7.29	7.69	8.12	8.80
120°	4.98	6.08	6.79	7.20	7.59	8.03	9.01
135°	4.45	5.52	6.40	6.92	7.28	7.67	8.57
150°	3.77	4.78	5.62	6.30	6.73	7.04	7.63