Jack in the Box — ORC Rating

GPH

650.5

OSN

633.2

LOA

9.449 m

Displacement

2819 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7264

Medium

0.9604

High

1.0786

Triple Offshore

Low

0.9258

Medium

1.1612

High

1.287

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.

6,41.7,4.674285,52,5.25,60,5.51,75,5.7,90,5.64,110,5.41,120,5.27,135,4.8,146.5,4.26917,150,4.11
8,40.9,5.503712,52,6.1,60,6.27,75,6.38,90,6.37,110,6.37,120,6.27,135,5.87,150,5.13,150.2,5.128114
10,38.7,5.945437,52,6.49,60,6.62,75,6.73,90,6.75,110,6.85,120,6.77,135,6.51,150,6,153.4,5.849103
12,37.5,6.075477,52,6.67,60,6.83,75,7.02,90,7.04,110,7.29,120,7.21,135,6.92,150,6.55,163.9,6.099216
14,37.3,6.147282,52,6.74,60,6.95,75,7.26,90,7.38,110,7.68,120,7.68,135,7.35,150,6.92,180,6.42
16,37.3,6.184996,52,6.78,60,7.01,75,7.41,90,7.65,110,7.98,120,8.12,135,7.79,150,7.32,180,6.8
20,37.5,6.176315,52,6.79,60,7.04,75,7.53,90,8.02,110,8.39,120,8.88,135,8.86,150,8.17,180,7.55

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.25	5.51	5.7	5.64	5.41	5.27	4.8	4.11
8	6.1	6.27	6.38	6.37	6.37	6.27	5.87	5.13
10	6.49	6.62	6.73	6.75	6.85	6.77	6.51	6
12	6.67	6.83	7.02	7.04	7.29	7.21	6.92	6.55
14	6.74	6.95	7.26	7.38	7.68	7.68	7.35	6.92
16	6.78	7.01	7.41	7.65	7.98	8.12	7.79	7.32
20	6.79	7.04	7.53	8.02	8.39	8.88	8.86	8.17

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.7°	3.49	146.5°	3.56
8	40.9°	4.16	150.2°	4.45
10	38.7°	4.64	153.4°	5.23
12	37.5°	4.82	163.9°	5.86
14	37.3°	4.89	180°	6.42
16	37.3°	4.92	180°	6.8
20	37.5°	4.9	180°	7.55

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