ROBELJO: ORC Rating

GPH

674.6

OSN

652.1

LOA

9.61 m

Displacement

4006 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5918

Medium

0.8205

High

0.9523

Triple Offshore

Low

0.7648

Medium

1.0103

High

1.1374

Boat Specifications

Dimensions

Length overall: 9.61 m
Beam: 3.21 m
Draft: 1.95 m
Displacement: 4006 kg
Crew weight: 550 kg
Wetted surface: 22.42 m²

Sails

Mainsail: 25.67 m²
Genoa: 29.29 m²
Spinnaker: 61.73 m²
Asymmetric spinnaker: 0 m²

Design

Type: First 31.7
Builder: Beneteau
Designer: Finot
Year built: 1990
Stability index: 105.2

Performance data

Polar CSV

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

6,43.2,4.293738,52,4.81,60,5.09,75,5.29,90,5.21,110,5.13,120,4.97,135,4.47,146,3.944333,150,3.78
8,41.4,5.079248,52,5.72,60,6.01,75,6.23,90,6.19,110,6.26,120,6.08,135,5.53,150,4.83,150.2,4.81697
10,40.8,5.719985,52,6.37,60,6.58,75,6.74,90,6.81,110,6.89,120,6.8,135,6.43,150,5.74,152,5.640199
12,39.4,6.082303,52,6.71,60,6.87,75,7.01,90,7.12,110,7.27,120,7.2,135,6.94,150,6.5,156.8,6.21236
14,38.7,6.201706,52,6.84,60,7.02,75,7.23,90,7.31,110,7.64,120,7.58,135,7.3,150,6.96,168.2,6.446226
16,38.5,6.261115,52,6.9,60,7.09,75,7.39,90,7.57,110,7.98,120,8,135,7.7,150,7.29,177.2,6.808128
20,38.8,6.261725,52,6.92,60,7.13,75,7.54,90,7.99,110,8.38,120,8.79,135,8.61,150,8.07,179,7.461136

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.81	5.09	5.29	5.21	5.13	4.97	4.47	3.78
8	5.72	6.01	6.23	6.19	6.26	6.08	5.53	4.83
10	6.37	6.58	6.74	6.81	6.89	6.8	6.43	5.74
12	6.71	6.87	7.01	7.12	7.27	7.2	6.94	6.5
14	6.84	7.02	7.23	7.31	7.64	7.58	7.3	6.96
16	6.9	7.09	7.39	7.57	7.98	8	7.7	7.29
20	6.92	7.13	7.54	7.99	8.38	8.79	8.61	8.07

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.2°	3.13	146°	3.27
8	41.4°	3.81	150.2°	4.18
10	40.8°	4.33	152°	4.98
12	39.4°	4.7	156.8°	5.71
14	38.7°	4.84	168.2°	6.31
16	38.5°	4.9	177.2°	6.8
20	38.8°	4.88	179°	7.46

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°	4.81	5.72	6.37	6.71	6.84	6.90	6.92
60°	5.09	6.01	6.58	6.87	7.02	7.09	7.13
75°	5.29	6.23	6.74	7.01	7.23	7.39	7.54
90°	5.21	6.19	6.81	7.12	7.31	7.57	7.99
110°	5.13	6.26	6.89	7.27	7.64	7.98	8.38
120°	4.97	6.08	6.80	7.20	7.58	8.00	8.79
135°	4.47	5.53	6.43	6.94	7.30	7.70	8.61
150°	3.78	4.83	5.74	6.50	6.96	7.29	8.07