Jack in the Box — ORC Rating

GPH

648.2

OSN

631.1

LOA

9.449 m

Displacement

2819 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7285

Medium

0.964

High

1.0853

Triple Offshore

Low

0.93

Medium

1.1646

High

1.292

Boat Specifications

Dimensions

Length overall: 9.449 m
Beam: 3.39 m
Draft: 1.77 m
Displacement: 2819 kg
Crew weight: 538 kg
Wetted surface: 18.48 m²

Sails

Mainsail: 25.93 m²
Genoa: 32.77 m²
Spinnaker: 66.58 m²
Asymmetric spinnaker: 0 m²

Design

Type: J-29
Builder: J-Boats
Designer: R.Johnstone
Year built: 1986

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.

6,41.6,4.69378,52,5.29,60,5.57,75,5.77,90,5.71,110,5.44,120,5.29,135,4.81,146.3,4.279082,150,4.11
8,40.8,5.535043,52,6.13,60,6.3,75,6.42,90,6.41,110,6.39,120,6.29,135,5.88,150,5.13,150.1,5.133253
10,38.3,5.95074,52,6.51,60,6.63,75,6.75,90,6.76,110,6.86,120,6.78,135,6.52,150,6,153.5,5.844004
12,37.2,6.101466,52,6.68,60,6.85,75,7.03,90,7.07,110,7.29,120,7.23,135,6.92,150,6.55,165,6.066718
14,36.7,6.148852,52,6.76,60,6.97,75,7.27,90,7.38,110,7.69,120,7.68,135,7.36,150,6.92,180,6.42
16,36.4,6.162304,52,6.8,60,7.03,75,7.42,90,7.66,110,7.98,120,8.12,135,7.8,150,7.33,180,6.8
20,36.8,6.206826,52,6.82,60,7.07,75,7.55,90,8.03,110,8.4,120,8.86,135,8.87,150,8.17,180,7.55

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.29	5.57	5.77	5.71	5.44	5.29	4.81	4.11
8	6.13	6.3	6.42	6.41	6.39	6.29	5.88	5.13
10	6.51	6.63	6.75	6.76	6.86	6.78	6.52	6
12	6.68	6.85	7.03	7.07	7.29	7.23	6.92	6.55
14	6.76	6.97	7.27	7.38	7.69	7.68	7.36	6.92
16	6.8	7.03	7.42	7.66	7.98	8.12	7.8	7.33
20	6.82	7.07	7.55	8.03	8.4	8.86	8.87	8.17

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.6°	3.51	146.3°	3.56
8	40.8°	4.19	150.1°	4.45
10	38.3°	4.67	153.5°	5.23
12	37.2°	4.86	165°	5.86
14	36.7°	4.93	180°	6.42
16	36.4°	4.96	180°	6.8
20	36.8°	4.97	180°	7.55

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