Windshear — ORC Rating

GPH

635.9

OSN

617

LOA

10.57 m

Displacement

4341 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6385

Medium

0.862

High

0.9818

Triple Offshore

Low

0.8237

Medium

1.0662

High

1.1902

Boat Specifications

Dimensions

Length overall: 10.57 m
Beam: 3.35 m
Draft: 2.03 m
Displacement: 4341 kg
Crew weight: 240 kg
Wetted surface: 25.58 m²

Sails

Mainsail: 32.94 m²
Genoa: 26.38 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 89.24 m²

Design

Type: J-105
Builder: J-Boats
Designer: Johnstone
Year built: 1992

Velocity Prediction

Polar CSV

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

6,42.8,4.47031,52,5,60,5.28,75,5.5,90,5.62,110,5.7,120,5.55,135,5,144,4.536369,150,4.23
8,40.9,5.292031,52,5.96,60,6.24,75,6.47,90,6.72,110,6.84,120,6.7,135,6.17,148,5.436012,150,5.33
10,40.1,5.93525,52,6.65,60,6.86,75,7.02,90,7.21,110,7.37,120,7.31,135,7,148.2,6.389042,150,6.27
12,39,6.292254,52,6.97,60,7.15,75,7.31,90,7.39,110,7.77,120,7.75,135,7.46,149.9,6.935202,150,6.93
14,38.6,6.423376,52,7.1,60,7.3,75,7.53,90,7.61,110,8.1,120,8.24,135,7.92,150,7.28,152,7.169168
16,38.2,6.464281,52,7.16,60,7.37,75,7.71,90,7.89,110,8.35,120,8.72,135,8.46,150,7.6,176.5,6.902875
20,37.9,6.5519,52,7.22,60,7.42,75,7.88,90,8.36,110,8.81,120,9.34,135,9.76,150,8.48,178,7.604633

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5	5.28	5.5	5.62	5.7	5.55	5	4.23
8	5.96	6.24	6.47	6.72	6.84	6.7	6.17	5.33
10	6.65	6.86	7.02	7.21	7.37	7.31	7	6.27
12	6.97	7.15	7.31	7.39	7.77	7.75	7.46	6.93
14	7.1	7.3	7.53	7.61	8.1	8.24	7.92	7.28
16	7.16	7.37	7.71	7.89	8.35	8.72	8.46	7.6
20	7.22	7.42	7.88	8.36	8.81	9.34	9.76	8.48

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.8°	3.28	144°	3.67
8	40.9°	4	148°	4.61
10	40.1°	4.54	148.2°	5.43
12	39°	4.89	149.9°	6
14	38.6°	5.02	152°	6.33
16	38.2°	5.08	176.5°	6.89
20	37.9°	5.17	178°	7.6

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