J-String — ORC Rating

GPH

664.3

OSN

646.6

LOA

7.997 m

Displacement

1497 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7036

Medium

0.9281

High

1.0528

Triple Offshore

Low

0.9023

Medium

1.1381

High

1.2824

Boat Specifications

Dimensions

Length overall: 7.997 m
Beam: 2.49 m
Draft: 1.49 m
Displacement: 1497 kg
Crew weight: 409 kg
Wetted surface: 13.74 m²

Sails

Mainsail: 21.45 m²
Genoa: 13.96 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 63.92 m²

Design

Type: J-80
Builder: T.P.Y.
Designer: R.Johnstone
Year built: 1993

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.

6,42.2,4.306129,52,4.83,60,5.1,75,5.31,90,5.53,110,5.63,120,5.49,135,4.93,145.1,4.438202,150,4.2
8,41.1,5.14887,52,5.76,60,5.97,75,6.11,90,6.33,110,6.46,120,6.38,135,6.03,148,5.377054,150,5.26
10,38.8,5.645818,52,6.22,60,6.36,75,6.49,90,6.6,110,6.98,120,6.94,135,6.62,149.9,6.079861,150,6.08
12,37.5,5.810778,52,6.41,60,6.59,75,6.82,90,6.86,110,7.4,120,7.56,135,7.19,150,6.54,151.2,6.481749
14,37.2,5.875486,52,6.48,60,6.71,75,7.1,90,7.27,110,7.72,120,8.12,135,7.85,150,6.93,176.4,6.15214
16,37.2,5.913149,52,6.52,60,6.77,75,7.25,90,7.63,110,8.04,120,8.54,135,8.67,150,7.44,177.4,6.536729
20,37.2,5.988476,52,6.64,60,6.92,75,7.38,90,8.06,110,8.75,120,9.51,135,10.94,139.3,10.697313,150,9.36

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.83	5.1	5.31	5.53	5.63	5.49	4.93	4.2
8	5.76	5.97	6.11	6.33	6.46	6.38	6.03	5.26
10	6.22	6.36	6.49	6.6	6.98	6.94	6.62	6.08
12	6.41	6.59	6.82	6.86	7.4	7.56	7.19	6.54
14	6.48	6.71	7.1	7.27	7.72	8.12	7.85	6.93
16	6.52	6.77	7.25	7.63	8.04	8.54	8.67	7.44
20	6.64	6.92	7.38	8.06	8.75	9.51	10.94	9.36

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.2°	3.19	145.1°	3.64
8	41.1°	3.88	148°	4.56
10	38.8°	4.4	149.9°	5.26
12	37.5°	4.61	151.2°	5.68
14	37.2°	4.68	176.4°	6.14
16	37.2°	4.71	177.4°	6.53
20	37.2°	4.77	139.3°	8.11

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