J-Rover — ORC Rating | RegattaPages

GPH

596.2

OSN

579.1

LOA

12.009 m

Displacement

5663 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7766

Medium

1.0436

High

1.1942

Triple Offshore

Low

0.9964

Medium

1.275

High

1.4211

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.

6,41.9,4.944166,52,5.55,60,5.83,75,6.05,90,5.95,110,5.9,120,5.76,135,5.22,142.3,4.827966,150,4.42
8,40.7,5.869672,52,6.62,60,6.86,75,7.03,90,6.98,110,7.11,120,6.98,135,6.45,148,5.671848,150,5.55
10,39.5,6.479835,52,7.16,60,7.33,75,7.48,90,7.48,110,7.67,120,7.61,135,7.3,150,6.57,150.4,6.544029
12,38.2,6.655156,52,7.37,60,7.55,75,7.75,90,7.8,110,8.06,120,8.07,135,7.78,150,7.31,156.5,7.000632
14,37.9,6.76734,52,7.46,60,7.66,75,7.96,90,8.1,110,8.32,120,8.53,135,8.25,150,7.75,173.2,7.069732
16,37.6,6.815689,52,7.51,60,7.73,75,8.12,90,8.38,110,8.55,120,8.9,135,8.78,150,8.19,180,7.53
20,37.1,6.958515,52,7.65,60,7.86,75,8.26,90,8.77,110,8.96,120,9.43,135,9.93,150,9.17,180,8.37

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.55	5.83	6.05	5.95	5.9	5.76	5.22	4.42
8	6.62	6.86	7.03	6.98	7.11	6.98	6.45	5.55
10	7.16	7.33	7.48	7.48	7.67	7.61	7.3	6.57
12	7.37	7.55	7.75	7.8	8.06	8.07	7.78	7.31
14	7.46	7.66	7.96	8.1	8.32	8.53	8.25	7.75
16	7.51	7.73	8.12	8.38	8.55	8.9	8.78	8.19
20	7.65	7.86	8.26	8.77	8.96	9.43	9.93	9.17

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.9°	3.68	142.3°	3.82
8	40.7°	4.45	148°	4.81
10	39.5°	5	150.4°	5.69
12	38.2°	5.23	156.5°	6.42
14	37.9°	5.34	173.2°	7.02
16	37.6°	5.4	180°	7.53
20	37.1°	5.55	180°	8.37

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