J-Rover — ORC Rating | RegattaPages

GPH

596.4

OSN

579.7

LOA

12.009 m

Displacement

5663 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7757

Medium

1.0423

High

1.1926

Triple Offshore

Low

0.9968

Medium

1.2739

High

1.4195

Boat Specifications

Dimensions

Length overall: 12.009 m
Beam: 3.77 m
Draft: 2.17 m
Displacement: 5663 kg
Crew weight: 525 kg
Wetted surface: 28.62 m²

Sails

Mainsail: 41.2 m²
Genoa: 39.09 m²
Spinnaker: 114.86 m²
Asymmetric spinnaker: 0 m²

Design

Type: J-39
Builder: J-Boats
Designer: R.Johnstone
Year built: 1991

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.

6,42.1,4.946253,52,5.55,60,5.85,75,6.09,90,6.01,110,5.92,120,5.78,135,5.23,142.3,4.840604,150,4.42
8,40.7,5.856482,52,6.6,60,6.85,75,7.03,90,6.99,110,7.11,120,6.99,135,6.46,147.8,5.684281,150,5.56
10,39.6,6.463224,52,7.15,60,7.32,75,7.47,90,7.48,110,7.66,120,7.61,135,7.31,150,6.57,150.3,6.550534
12,38.2,6.642431,52,7.36,60,7.54,75,7.74,90,7.8,110,8.05,120,8.07,135,7.79,150,7.31,156.5,7.000632
14,37.6,6.727338,52,7.45,60,7.65,75,7.95,90,8.09,110,8.33,120,8.53,135,8.26,150,7.76,173,7.072719
16,37.4,6.78487,52,7.5,60,7.72,75,8.1,90,8.36,110,8.57,120,8.9,135,8.78,150,8.19,180,7.53
20,37.2,6.942614,52,7.64,60,7.84,75,8.24,90,8.76,110,8.95,120,9.42,135,9.93,150,9.18,180,8.37

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.55	5.85	6.09	6.01	5.92	5.78	5.23	4.42
8	6.6	6.85	7.03	6.99	7.11	6.99	6.46	5.56
10	7.15	7.32	7.47	7.48	7.66	7.61	7.31	6.57
12	7.36	7.54	7.74	7.8	8.05	8.07	7.79	7.31
14	7.45	7.65	7.95	8.09	8.33	8.53	8.26	7.76
16	7.5	7.72	8.1	8.36	8.57	8.9	8.78	8.19
20	7.64	7.84	8.24	8.76	8.95	9.42	9.93	9.18

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.1°	3.67	142.3°	3.83
8	40.7°	4.44	147.8°	4.81
10	39.6°	4.98	150.3°	5.69
12	38.2°	5.22	156.5°	6.42
14	37.6°	5.33	173°	7.02
16	37.4°	5.39	180°	7.53
20	37.2°	5.53	180°	8.37

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