Boli: ORC Rating

GPH

660.1

OSN

640.4

LOA

9.49 m

Displacement

2881 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6302

Medium

0.8439

High

0.958

Triple Offshore

Low

0.8052

Medium

1.0209

High

1.1324

Boat Specifications

Dimensions

Length overall: 9.49 m
Beam: 3.2 m
Draft: 1.82 m
Displacement: 2881 kg
Crew weight: 550 kg
Wetted surface: 17.79 m²

Sails

Mainsail: 27.72 m²
Genoa: 26.55 m²
Spinnaker: 56.27 m²
Asymmetric spinnaker: 0 m²

Design

Type: Yamaha 31S
Builder: Yamaha
Designer: Yamaha
Year built: 1989
Stability index: 115.2

Performance data

Polar CSV

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

6,42,4.602064,52,5.16,60,5.41,75,5.55,90,5.44,110,5.34,120,5.18,135,4.68,145.6,4.144884,150,3.95
8,40.6,5.413085,52,6.01,60,6.19,75,6.29,90,6.25,110,6.32,120,6.19,135,5.73,150,5.01,150.5,4.986467
10,38.2,5.828033,52,6.43,60,6.56,75,6.67,90,6.72,110,6.83,120,6.75,135,6.42,150,5.89,154.1,5.702802
12,37.2,6.026139,52,6.64,60,6.78,75,6.93,90,7,110,7.21,120,7.15,135,6.87,150,6.49,161.9,6.080909
14,36.9,6.11491,52,6.75,60,6.92,75,7.13,90,7.22,110,7.54,120,7.52,135,7.25,150,6.89,175.4,6.360488
16,36.6,6.153329,52,6.81,60,7,75,7.28,90,7.45,110,7.83,120,7.87,135,7.64,150,7.25,179,6.76103
20,37,6.210593,52,6.87,60,7.08,75,7.45,90,7.79,110,8.25,120,8.65,135,8.57,150,8.01,179,7.441133

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.16	5.41	5.55	5.44	5.34	5.18	4.68	3.95
8	6.01	6.19	6.29	6.25	6.32	6.19	5.73	5.01
10	6.43	6.56	6.67	6.72	6.83	6.75	6.42	5.89
12	6.64	6.78	6.93	7	7.21	7.15	6.87	6.49
14	6.75	6.92	7.13	7.22	7.54	7.52	7.25	6.89
16	6.81	7	7.28	7.45	7.83	7.87	7.64	7.25
20	6.87	7.08	7.45	7.79	8.25	8.65	8.57	8.01

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42°	3.42	145.6°	3.42
8	40.6°	4.11	150.5°	4.34
10	38.2°	4.58	154.1°	5.13
12	37.2°	4.8	161.9°	5.78
14	36.9°	4.89	175.4°	6.34
16	36.6°	4.94	179°	6.76
20	37°	4.96	179°	7.44

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°	5.16	6.01	6.43	6.64	6.75	6.81	6.87
60°	5.41	6.19	6.56	6.78	6.92	7.00	7.08
75°	5.55	6.29	6.67	6.93	7.13	7.28	7.45
90°	5.44	6.25	6.72	7.00	7.22	7.45	7.79
110°	5.34	6.32	6.83	7.21	7.54	7.83	8.25
120°	5.18	6.19	6.75	7.15	7.52	7.87	8.65
135°	4.68	5.73	6.42	6.87	7.25	7.64	8.57
150°	3.95	5.01	5.89	6.49	6.89	7.25	8.01