JONATAN: ORC Rating

GPH

672.6

OSN

650.7

LOA

9.61 m

Displacement

3600 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5881

Medium

0.8201

High

0.9665

Triple Offshore

Low

0.7625

Medium

1.0137

High

1.1589

Boat Specifications

Dimensions

Length overall: 9.61 m
Beam: 3.21 m
Draft: 1.94 m
Displacement: 3600 kg
Crew weight: 600 kg
Wetted surface: 21.21 m²

Sails

Mainsail: 24.41 m²
Genoa: 27.57 m²
Spinnaker: 49.16 m²
Asymmetric spinnaker: 0 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.

6,43.1,4.273023,52,4.81,60,5.1,75,5.33,90,5.26,110,5.11,120,4.94,135,4.42,147,3.863257,150,3.74
8,42.4,5.145877,52,5.75,60,6.06,75,6.3,90,6.25,110,6.25,120,6.06,135,5.47,150,4.78,150.5,4.756676
10,41.2,5.741513,52,6.4,60,6.62,75,6.79,90,6.84,110,6.9,120,6.8,135,6.37,150,5.67,153,5.521845
12,39.4,6.134068,52,6.76,60,6.93,75,7.08,90,7.21,110,7.31,120,7.21,135,6.91,150,6.44,157,6.127073
14,38.4,6.329005,52,6.95,60,7.13,75,7.33,90,7.5,110,7.73,120,7.6,135,7.28,150,6.92,180,6.28
16,38.2,6.400656,52,7.03,60,7.25,75,7.56,90,7.68,110,8.15,120,8.03,135,7.68,150,7.26,180,6.79
20,38.6,6.423376,52,7.06,60,7.31,75,7.81,90,8.21,110,8.8,120,8.97,135,8.57,150,8.03,180,7.48

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.81	5.1	5.33	5.26	5.11	4.94	4.42	3.74
8	5.75	6.06	6.3	6.25	6.25	6.06	5.47	4.78
10	6.4	6.62	6.79	6.84	6.9	6.8	6.37	5.67
12	6.76	6.93	7.08	7.21	7.31	7.21	6.91	6.44
14	6.95	7.13	7.33	7.5	7.73	7.6	7.28	6.92
16	7.03	7.25	7.56	7.68	8.15	8.03	7.68	7.26
20	7.06	7.31	7.81	8.21	8.8	8.97	8.57	8.03

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.1°	3.12	147°	3.24
8	42.4°	3.8	150.5°	4.14
10	41.2°	4.32	153°	4.92
12	39.4°	4.74	157°	5.64
14	38.4°	4.96	180°	6.28
16	38.2°	5.03	180°	6.79
20	38.6°	5.02	180°	7.48

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	5.75	6.40	6.76	6.95	7.03	7.06
60°	5.10	6.06	6.62	6.93	7.13	7.25	7.31
75°	5.33	6.30	6.79	7.08	7.33	7.56	7.81
90°	5.26	6.25	6.84	7.21	7.50	7.68	8.21
110°	5.11	6.25	6.90	7.31	7.73	8.15	8.80
120°	4.94	6.06	6.80	7.21	7.60	8.03	8.97
135°	4.42	5.47	6.37	6.91	7.28	7.68	8.57
150°	3.74	4.78	5.67	6.44	6.92	7.26	8.03