J Power — ORC Rating | RegattaPages

GPH

686.9

OSN

666

LOA

6.907 m

Displacement

895 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6651

Medium

0.8906

High

1.0378

Triple Offshore

Low

0.8565

Medium

1.1042

High

1.2864

Boat Specifications

Dimensions

Length overall: 6.907 m
Beam: 2.25 m
Draft: 1.39 m
Displacement: 895 kg
Crew weight: 340 kg
Wetted surface: 11.25 m²

Sails

Mainsail: 15.8 m²
Genoa: 10.01 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 45.64 m²

Design

Type: J-70 ONE DESIGN
Builder: J BOATS
Designer: JOHNSTONE
Year built: 2013

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.

6,42.4,4.035451,52,4.53,60,4.77,75,5.03,90,5.35,110,5.42,120,5.25,135,4.7,145.7,4.200469,150,4
8,41.3,4.845167,52,5.43,60,5.69,75,5.85,90,6.14,110,6.22,120,6.12,135,5.75,147.7,5.158165,150,5.04
10,39.9,5.396491,52,5.93,60,6.09,75,6.24,90,6.62,110,6.86,120,6.73,135,6.35,149.5,5.837778,150,5.8
12,37.9,5.677468,52,6.22,60,6.4,75,6.61,90,6.91,110,7.56,120,7.48,135,6.95,150,6.25,150.6,6.221205
14,36.6,5.754733,52,6.42,60,6.7,75,7.05,90,7.19,110,8.08,120,8.37,135,7.7,150,6.66,176.9,5.93869
16,36.8,5.807191,52,6.5,60,6.84,75,7.43,90,7.65,110,8.45,120,9.11,135,8.59,143.2,7.955227,150,7.35
20,37.5,5.823383,52,6.53,60,6.9,75,7.69,90,8.61,110,9.4,120,10.3,135,11.76,136.3,11.660281,150,9.73

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.53	4.77	5.03	5.35	5.42	5.25	4.7	4
8	5.43	5.69	5.85	6.14	6.22	6.12	5.75	5.04
10	5.93	6.09	6.24	6.62	6.86	6.73	6.35	5.8
12	6.22	6.4	6.61	6.91	7.56	7.48	6.95	6.25
14	6.42	6.7	7.05	7.19	8.08	8.37	7.7	6.66
16	6.5	6.84	7.43	7.65	8.45	9.11	8.59	7.35
20	6.53	6.9	7.69	8.61	9.4	10.3	11.76	9.73

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.4°	2.98	145.7°	3.47
8	41.3°	3.64	147.7°	4.36
10	39.9°	4.14	149.5°	5.03
12	37.9°	4.48	150.6°	5.42
14	36.6°	4.62	176.9°	5.93
16	36.8°	4.65	143.2°	6.37
20	37.5°	4.62	136.3°	8.43

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