J 24 ONE DESIGN — ORC Rating

GPH

739.2

OSN

715.7

LOA

7.318 m

Displacement

1444 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5524

Medium

0.7519

High

0.8628

Triple Offshore

Low

0.7094

Medium

0.9153

High

1.0298

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: 12.43 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: 92.5

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.

6,43.6,4.087428,52,4.53,60,4.77,75,4.91,90,4.82,110,4.77,120,4.62,135,4.13,147.5,3.592638,150,3.5
8,41.8,4.775472,52,5.31,60,5.51,75,5.61,90,5.61,110,5.65,120,5.53,135,5.06,150,4.46,152,4.383046
10,40.5,5.234046,52,5.75,60,5.89,75,6,90,6.09,110,6.14,120,6.05,135,5.77,150,5.27,155,5.064505
12,38.8,5.466178,52,5.99,60,6.12,75,6.26,90,6.42,110,6.54,120,6.44,135,6.18,150,5.85,167.6,5.375396
14,38.2,5.598984,52,6.14,60,6.3,75,6.49,90,6.65,110,6.91,120,6.82,135,6.55,150,6.22,177.2,5.776897
16,38.2,5.649884,52,6.21,60,6.4,75,6.69,90,6.8,110,7.26,120,7.21,135,6.92,150,6.56,179,6.130934
20,39.3,5.685928,52,6.24,60,6.49,75,6.89,90,7.22,110,7.91,120,8.25,135,7.84,150,7.28,179,6.771031

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.53	4.77	4.91	4.82	4.77	4.62	4.13	3.5
8	5.31	5.51	5.61	5.61	5.65	5.53	5.06	4.46
10	5.75	5.89	6	6.09	6.14	6.05	5.77	5.27
12	5.99	6.12	6.26	6.42	6.54	6.44	6.18	5.85
14	6.14	6.3	6.49	6.65	6.91	6.82	6.55	6.22
16	6.21	6.4	6.69	6.8	7.26	7.21	6.92	6.56
20	6.24	6.49	6.89	7.22	7.91	8.25	7.84	7.28

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.6°	2.96	147.5°	3.03
8	41.8°	3.56	152°	3.87
10	40.5°	3.98	155°	4.59
12	38.8°	4.26	167.6°	5.25
14	38.2°	4.4	177.2°	5.77
16	38.2°	4.44	179°	6.13
20	39.3°	4.4	179°	6.77

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