J 24 ONE DESIGN — ORC Rating

GPH

734

OSN

713.1

LOA

7.318 m

Displacement

1445 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5564

Medium

0.7531

High

0.8578

Triple Offshore

Low

0.7171

Medium

0.9196

High

1.0364

Boat Specifications

Dimensions

Length overall: 7.318 m
Beam: 2.69 m
Draft: 1.24 m
Displacement: 1445 kg
Crew weight: 400 kg
Wetted surface: 12.31 m²

Sails

Mainsail: 15.77 m²
Genoa: 17.79 m²
Spinnaker: 34.59 m²
Asymmetric spinnaker: 0 m²

Design

Type: J-24
Builder: J-BOATS
Designer: JOHN STONE
Year built: 1977

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.

6,43.1,4.026502,52,4.5,60,4.78,75,4.99,90,4.94,110,4.87,120,4.73,135,4.26,148.5,3.670951,150,3.62
8,42,4.723171,52,5.3,60,5.55,75,5.7,90,5.71,110,5.75,120,5.64,135,5.17,150,4.55,152.5,4.453159
10,41.2,5.223182,52,5.75,60,5.91,75,6.04,90,6.14,110,6.19,120,6.11,135,5.85,150,5.35,154,5.195851
12,39.8,5.492764,52,5.99,60,6.13,75,6.29,90,6.48,110,6.61,120,6.5,135,6.23,150,5.91,173,5.390178
14,39,5.597404,52,6.12,60,6.31,75,6.55,90,6.75,110,7.05,120,6.94,135,6.62,150,6.25,180,5.85
16,39,5.636007,52,6.17,60,6.4,75,6.78,90,6.95,110,7.5,120,7.41,135,7.05,150,6.62,180,6.18
20,40.5,5.628572,52,6.16,60,6.43,75,6.96,90,7.44,110,8.16,120,8.64,135,8.11,150,7.44,180,6.89

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.5	4.78	4.99	4.94	4.87	4.73	4.26	3.62
8	5.3	5.55	5.7	5.71	5.75	5.64	5.17	4.55
10	5.75	5.91	6.04	6.14	6.19	6.11	5.85	5.35
12	5.99	6.13	6.29	6.48	6.61	6.5	6.23	5.91
14	6.12	6.31	6.55	6.75	7.05	6.94	6.62	6.25
16	6.17	6.4	6.78	6.95	7.5	7.41	7.05	6.62
20	6.16	6.43	6.96	7.44	8.16	8.64	8.11	7.44

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.1°	2.94	148.5°	3.13
8	42°	3.51	152.5°	3.95
10	41.2°	3.93	154°	4.67
12	39.8°	4.22	173°	5.35
14	39°	4.35	180°	5.85
16	39°	4.38	180°	6.18
20	40.5°	4.28	180°	6.89

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