Pure Magic — ORC Rating

GPH

669.6

OSN

652.4

LOA

8.36 m

Displacement

1730 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6793

Medium

0.9208

High

1.0559

Triple Offshore

Low

0.8846

Medium

1.1334

High

1.2849

Boat Specifications

Dimensions

Length overall: 8.36 m
Beam: 2.6 m
Draft: 1.51 m
Displacement: 1730 kg
Crew weight: 431 kg
Wetted surface: 15.25 m²

Sails

Mainsail: 24.33 m²
Genoa: 23.71 m²
Spinnaker: 43.35 m²
Asymmetric spinnaker: 0 m²

Design

Type: J-27
Builder: J boats
Designer: Johnstone
Year built: 1983

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.

6,44,4.518032,52,5.01,60,5.35,75,5.66,90,5.67,110,5.32,120,5.13,135,4.61,146.4,3.973965,150,3.82
8,43,5.359924,52,5.93,60,6.17,75,6.35,90,6.37,110,6.26,120,6.14,135,5.64,150,4.85,150.7,4.816131
10,40.7,5.790531,52,6.36,60,6.54,75,6.73,90,6.76,110,6.74,120,6.64,135,6.34,150,5.75,152.1,5.646293
12,39.2,5.948813,52,6.52,60,6.74,75,7.1,90,7.19,110,7.29,120,7.14,135,6.77,150,6.38,163.7,5.949123
14,38.2,6.006183,52,6.61,60,6.87,75,7.34,90,7.62,110,7.87,120,7.71,135,7.26,150,6.78,180,6.29
16,37.8,6.049446,52,6.68,60,6.96,75,7.48,90,7.96,110,8.24,120,8.4,135,7.82,150,7.24,180,6.68
20,38.1,6.099614,52,6.76,60,7.06,75,7.61,90,8.23,110,8.89,120,9.54,135,9.34,150,8.34,180,7.56

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.01	5.35	5.66	5.67	5.32	5.13	4.61	3.82
8	5.93	6.17	6.35	6.37	6.26	6.14	5.64	4.85
10	6.36	6.54	6.73	6.76	6.74	6.64	6.34	5.75
12	6.52	6.74	7.1	7.19	7.29	7.14	6.77	6.38
14	6.61	6.87	7.34	7.62	7.87	7.71	7.26	6.78
16	6.68	6.96	7.48	7.96	8.24	8.4	7.82	7.24
20	6.76	7.06	7.61	8.23	8.89	9.54	9.34	8.34

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	44°	3.25	146.4°	3.31
8	43°	3.92	150.7°	4.2
10	40.7°	4.39	152.1°	4.99
12	39.2°	4.61	163.7°	5.71
14	38.2°	4.72	180°	6.29
16	37.8°	4.78	180°	6.68
20	38.1°	4.8	180°	7.56

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