Jam Session — ORC Rating

GPH

587.1

OSN

572.1

LOA

12.19 m

Displacement

6906 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7885

Medium

1.0468

High

1.1722

Triple Offshore

Low

1.0177

Medium

1.2945

High

1.4212

Boat Specifications

Dimensions

Length overall: 12.19 m
Beam: 3.64 m
Draft: 2.22 m
Displacement: 6906 kg
Crew weight: 170 kg
Wetted surface: 32.16 m²

Sails

Mainsail: 47.83 m²
Genoa: 41.24 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 155.04 m²

Design

Type: J-122 (DK)
Builder: J-boats
Designer: Johnstone
Year built: 2006

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.

6,42.7,4.925742,52,5.53,60,5.84,75,6.1,90,6.12,110,6.25,120,6.12,135,5.49,143.6,4.994448,150,4.64
8,41.2,5.847837,52,6.6,60,6.92,75,7.14,90,7.2,110,7.45,120,7.36,135,6.82,146.8,6.011251,150,5.8
10,40.7,6.489615,52,7.24,60,7.48,75,7.66,90,7.68,110,7.94,120,7.96,135,7.67,148.2,7.000884,150,6.87
12,39.9,6.713027,52,7.47,60,7.71,75,7.94,90,8,110,8.19,120,8.38,135,8.15,150,7.6,150.7,7.556739
14,39.5,6.803827,52,7.57,60,7.81,75,8.12,90,8.27,110,8.41,120,8.69,135,8.65,150,7.97,151.9,7.856013
16,39.2,6.852104,52,7.61,60,7.85,75,8.22,90,8.52,110,8.64,120,8.98,135,9.21,150,8.32,175.8,7.43998
20,39.3,6.991107,52,7.74,60,7.95,75,8.29,90,8.84,110,9.1,120,9.55,135,10.35,150,9.17,177.4,8.21846

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.53	5.84	6.1	6.12	6.25	6.12	5.49	4.64
8	6.6	6.92	7.14	7.2	7.45	7.36	6.82	5.8
10	7.24	7.48	7.66	7.68	7.94	7.96	7.67	6.87
12	7.47	7.71	7.94	8	8.19	8.38	8.15	7.6
14	7.57	7.81	8.12	8.27	8.41	8.69	8.65	7.97
16	7.61	7.85	8.22	8.52	8.64	8.98	9.21	8.32
20	7.74	7.95	8.29	8.84	9.1	9.55	10.35	9.17

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.7°	3.62	143.6°	4.02
8	41.2°	4.4	146.8°	5.03
10	40.7°	4.92	148.2°	5.95
12	39.9°	5.15	150.7°	6.59
14	39.5°	5.25	151.9°	6.93
16	39.2°	5.31	175.8°	7.42
20	39.3°	5.41	177.4°	8.21

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