Jam Session — ORC Rating

GPH

624.2

OSN

602.6

LOA

10.57 m

Displacement

4498 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6467

Medium

0.8848

High

1.0216

Triple Offshore

Low

0.8313

Medium

1.0888

High

1.2333

Boat Specifications

Dimensions

Length overall: 10.57 m
Beam: 3.34 m
Draft: 2.04 m
Displacement: 4498 kg
Crew weight: 660 kg
Wetted surface: 25.72 m²

Sails

Mainsail: 34.19 m²
Genoa: 24.35 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 88.37 m²

Design

Type: J-105
Builder: J Boats inc.
Designer: R. Johnstone
Year built: 1992
Stability index: 116.6

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.

6,43,4.566874,52,5.08,60,5.34,75,5.5,90,5.65,110,5.7,120,5.54,135,4.99,143.9,4.52976,150,4.23
8,41.2,5.462412,52,6.08,60,6.33,75,6.47,90,6.74,110,6.84,120,6.69,135,6.19,147.8,5.495199,150,5.37
10,39.4,6.069362,52,6.73,60,6.91,75,7.04,90,7.31,110,7.45,120,7.36,135,7.02,148.7,6.401713,150,6.32
12,37.5,6.441014,52,7.11,60,7.25,75,7.39,90,7.65,110,7.91,120,7.86,135,7.54,149.6,7.002788,150,6.97
14,36.3,6.6259,52,7.32,60,7.49,75,7.67,90,7.86,110,8.32,120,8.35,135,8.03,150,7.37,150.2,7.352217
16,35.8,6.71957,52,7.45,60,7.65,75,7.91,90,8.03,110,8.69,120,8.83,135,8.54,150,7.7,173.6,6.90302
20,35.7,6.834272,52,7.58,60,7.83,75,8.24,90,8.51,110,9.24,120,9.89,135,9.77,150,8.42,176.6,7.643454

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.08	5.34	5.5	5.65	5.7	5.54	4.99	4.23
8	6.08	6.33	6.47	6.74	6.84	6.69	6.19	5.37
10	6.73	6.91	7.04	7.31	7.45	7.36	7.02	6.32
12	7.11	7.25	7.39	7.65	7.91	7.86	7.54	6.97
14	7.32	7.49	7.67	7.86	8.32	8.35	8.03	7.37
16	7.45	7.65	7.91	8.03	8.69	8.83	8.54	7.7
20	7.58	7.83	8.24	8.51	9.24	9.89	9.77	8.42

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43°	3.34	143.9°	3.66
8	41.2°	4.11	147.8°	4.65
10	39.4°	4.69	148.7°	5.47
12	37.5°	5.11	149.6°	6.04
14	36.3°	5.34	150.2°	6.38
16	35.8°	5.45	173.6°	6.86
20	35.7°	5.55	176.6°	7.63

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