GEMINI JR — ORC Rating

GPH

663

OSN

646.2

LOA

8.032 m

Displacement

1541 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.627

Medium

0.8245

High

0.9343

Triple Offshore

Low

0.8054

Medium

1.0123

High

1.1403

Boat Specifications

Dimensions

Length overall: 8.032 m
Beam: 2.49 m
Draft: 1.51 m
Displacement: 1541 kg
Crew weight: 390 kg
Wetted surface: 13.78 m²

Sails

Mainsail: 21.38 m²
Genoa: 13.58 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 64.7 m²

Design

Type: J-80 OD
Builder: J-COMPOSITE
Designer: JOHNSTONE
Year built: 1995

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.

6,42.8,4.361278,52,4.89,60,5.17,75,5.38,90,5.56,110,5.68,120,5.54,135,4.97,145,4.468035,150,4.23
8,42,5.207599,52,5.78,60,6,75,6.14,90,6.33,110,6.47,120,6.41,135,6.06,148,5.400637,150,5.29
10,39.4,5.668189,52,6.22,60,6.36,75,6.5,90,6.61,110,6.99,120,6.97,135,6.65,150,6.096819
12,38.1,5.832756,52,6.42,60,6.59,75,6.81,90,6.88,110,7.42,120,7.58,135,7.23,150,6.57,151,6.517118
14,37.5,5.873801,52,6.49,60,6.72,75,7.1,90,7.26,110,7.72,120,8.14,135,7.89,150,6.96,176,6.165018
16,37.7,5.91489,52,6.53,60,6.78,75,7.28,90,7.64,110,8.05,120,8.57,135,8.71,150,7.47,177.5,6.546231
20,37.9,5.968946,52,6.62,60,6.89,75,7.41,90,8.12,110,8.8,120,9.58,135,11.09,139.8,10.788221,150,9.52

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.89	5.17	5.38	5.56	5.68	5.54	4.97	4.23
8	5.78	6	6.14	6.33	6.47	6.41	6.06	5.29
10	6.22	6.36	6.5	6.61	6.99	6.97	6.65	6.1
12	6.42	6.59	6.81	6.88	7.42	7.58	7.23	6.57
14	6.49	6.72	7.1	7.26	7.72	8.14	7.89	6.96
16	6.53	6.78	7.28	7.64	8.05	8.57	8.71	7.47
20	6.62	6.89	7.41	8.12	8.8	9.58	11.09	9.52

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.8°	3.2	145°	3.66
8	42°	3.87	148°	4.58
10	39.4°	4.38	150°	5.28
12	38.1°	4.59	151°	5.7
14	37.5°	4.66	176°	6.15
16	37.7°	4.68	177.5°	6.54
20	37.9°	4.71	139.8°	8.24

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