BASIC: ORC Rating

GPH

621.2

OSN

606.4

LOA

9.5 m

Displacement

3167 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7594

Medium

0.9997

High

1.1295

Triple Offshore

Low

0.9747

Medium

1.2125

High

1.3478

Boat Specifications

Dimensions

Length overall: 9.5 m
Beam: 3.24 m
Draft: 2 m
Displacement: 3167 kg
Crew weight: 542 kg
Wetted surface: 19.57 m²

Sails

Mainsail: 35.93 m²
Genoa: 30.32 m²
Spinnaker: 61.47 m²
Asymmetric spinnaker: 0 m²

Design

Type: SEAM 31
Builder: TSUBOI YACHT
Designer: I.YOKOYAMA
Year built: 1999

Performance data

Polar CSV

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

6,41.7,5.00912,52,5.63,60,5.92,75,6.15,90,6.11,110,5.74,120,5.54,135,4.98,144.7,4.447779,150,4.19
8,40.2,5.839255,52,6.46,60,6.63,75,6.76,90,6.77,110,6.7,120,6.57,135,6.08,149.5,5.269088,150,5.25
10,37.7,6.167663,52,6.8,60,6.94,75,7.08,90,7.11,110,7.16,120,7.07,135,6.77,150,6.17,152.6,6.037291
12,36.7,6.286048,52,6.93,60,7.11,75,7.35,90,7.44,110,7.62,120,7.53,135,7.19,150,6.79,162.2,6.354178
14,36.3,6.352923,52,7,60,7.2,75,7.56,90,7.77,110,8.07,120,8.03,135,7.64,150,7.18,180,6.66
16,36.3,6.390147,52,7.04,60,7.26,75,7.68,90,8.05,110,8.39,120,8.55,135,8.15,150,7.6,180,7.07
20,36.3,6.452187,52,7.13,60,7.35,75,7.79,90,8.36,110,8.92,120,9.48,135,9.43,150,8.59,180,7.88

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.63	5.92	6.15	6.11	5.74	5.54	4.98	4.19
8	6.46	6.63	6.76	6.77	6.7	6.57	6.08	5.25
10	6.8	6.94	7.08	7.11	7.16	7.07	6.77	6.17
12	6.93	7.11	7.35	7.44	7.62	7.53	7.19	6.79
14	7	7.2	7.56	7.77	8.07	8.03	7.64	7.18
16	7.04	7.26	7.68	8.05	8.39	8.55	8.15	7.6
20	7.13	7.35	7.79	8.36	8.92	9.48	9.43	8.59

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.7°	3.74	144.7°	3.63
8	40.2°	4.46	149.5°	4.54
10	37.7°	4.88	152.6°	5.36
12	36.7°	5.04	162.2°	6.05
14	36.3°	5.12	180°	6.66
16	36.3°	5.15	180°	7.07
20	36.3°	5.2	180°	7.88

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°	5.63	6.46	6.80	6.93	7.00	7.04	7.13
60°	5.92	6.63	6.94	7.11	7.20	7.26	7.35
75°	6.15	6.76	7.08	7.35	7.56	7.68	7.79
90°	6.11	6.77	7.11	7.44	7.77	8.05	8.36
110°	5.74	6.70	7.16	7.62	8.07	8.39	8.92
120°	5.54	6.57	7.07	7.53	8.03	8.55	9.48
135°	4.98	6.08	6.77	7.19	7.64	8.15	9.43
150°	4.19	5.25	6.17	6.79	7.18	7.60	8.59