J 24 ONE DESIGN — ORC Rating

GPH

743.9

OSN

721.2

LOA

7.318 m

Displacement

1444 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5453

Medium

0.7442

High

0.8569

Triple Offshore

Low

0.7031

Medium

0.9098

High

1.0296

Boat Specifications

Dimensions

Length overall: 7.318 m
Beam: 2.69 m
Draft: 1.24 m
Displacement: 1444 kg
Crew weight: 400 kg
Wetted surface: 12.17 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
Stability index: 94.3

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.

6,43.5,3.956578,52,4.4,60,4.67,75,4.87,90,4.81,110,4.78,120,4.63,135,4.16,148.4,3.604442,150,3.54
8,42.4,4.658372,52,5.21,60,5.47,75,5.62,90,5.65,110,5.69,120,5.57,135,5.07,150,4.48,152.3,4.382232
10,41.8,5.204728,52,5.7,60,5.87,75,5.98,90,6.09,110,6.14,120,6.06,135,5.8,150,5.29,153.8,5.126728
12,40.1,5.464614,52,5.95,60,6.09,75,6.23,90,6.43,110,6.54,120,6.43,135,6.17,150,5.87,163.1,5.507865
14,39.1,5.592449,52,6.1,60,6.27,75,6.49,90,6.72,110,6.96,120,6.85,135,6.55,150,6.21,177.2,5.786909
16,38.8,5.632986,52,6.17,60,6.39,75,6.72,90,6.87,110,7.39,120,7.29,135,6.96,150,6.57,179,6.120932
20,39.9,5.657191,52,6.19,60,6.45,75,6.96,90,7.37,110,8.06,120,8.39,135,7.94,150,7.36,178.1,6.793735

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.4	4.67	4.87	4.81	4.78	4.63	4.16	3.54
8	5.21	5.47	5.62	5.65	5.69	5.57	5.07	4.48
10	5.7	5.87	5.98	6.09	6.14	6.06	5.8	5.29
12	5.95	6.09	6.23	6.43	6.54	6.43	6.17	5.87
14	6.1	6.27	6.49	6.72	6.96	6.85	6.55	6.21
16	6.17	6.39	6.72	6.87	7.39	7.29	6.96	6.57
20	6.19	6.45	6.96	7.37	8.06	8.39	7.94	7.36

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.5°	2.87	148.4°	3.07
8	42.4°	3.44	152.3°	3.88
10	41.8°	3.88	153.8°	4.6
12	40.1°	4.18	163.1°	5.27
14	39.1°	4.34	177.2°	5.78
16	38.8°	4.39	179°	6.12
20	39.9°	4.34	178.1°	6.79

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