MIROKU II — ORC Rating

GPH

561.4

OSN

544.9

LOA

12 m

Displacement

4079 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7031

Medium

0.9714

High

1.127

Triple Offshore

Low

0.9187

Medium

1.2115

High

1.3907

Boat Specifications

Dimensions

Length overall: 12 m
Beam: 3.36 m
Draft: 2.2 m
Displacement: 4079 kg
Crew weight: 791 kg
Wetted surface: 28.25 m²

Sails

Mainsail: 40.39 m²
Genoa: 45.15 m²
Spinnaker: 92.65 m²
Asymmetric spinnaker: 0 m²

Design

Type: YOKOYAMA 12m
Builder: ITO BOAT YARD
Designer: AKIRA YOKOYAMA
Year built: 2003

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.

6,43.9,5.273741,52,5.89,60,6.29,75,6.64,90,6.57,110,6,120,5.83,135,5.25,140,4.947494,150,4.37
8,42.8,6.419256,52,7.14,60,7.45,75,7.65,90,7.65,110,7.42,120,7.28,135,6.61,139.2,6.32765,150,5.53
10,40.5,6.996263,52,7.74,60,7.96,75,8.16,90,8.18,110,8.17,120,8.07,135,7.66,146.5,6.943397,150,6.69
12,39.4,7.234059,52,7.95,60,8.22,75,8.63,90,8.73,110,8.87,120,8.78,135,8.26,150,7.62,154,7.387677
14,38.6,7.319066,52,8.07,60,8.39,75,8.95,90,9.29,110,9.48,120,9.58,135,8.95,150,8.19,162,7.654645
16,38.2,7.380479,52,8.15,60,8.5,75,9.15,90,9.75,110,9.97,120,10.4,135,9.74,150,8.8,180,7.86
20,37.7,7.469444,52,8.28,60,8.65,75,9.36,90,10.22,110,10.84,120,11.53,135,11.84,150,10.31,180,8.96

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.89	6.29	6.64	6.57	6	5.83	5.25	4.37
8	7.14	7.45	7.65	7.65	7.42	7.28	6.61	5.53
10	7.74	7.96	8.16	8.18	8.17	8.07	7.66	6.69
12	7.95	8.22	8.63	8.73	8.87	8.78	8.26	7.62
14	8.07	8.39	8.95	9.29	9.48	9.58	8.95	8.19
16	8.15	8.5	9.15	9.75	9.97	10.4	9.74	8.8
20	8.28	8.65	9.36	10.22	10.84	11.53	11.84	10.31

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.9°	3.8	140°	3.79
8	42.8°	4.71	139.2°	4.79
10	40.5°	5.32	146.5°	5.79
12	39.4°	5.59	154°	6.64
14	38.6°	5.72	162°	7.28
16	38.2°	5.8	180°	7.86
20	37.7°	5.91	180°	8.96

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