SPITFIRE — ORC Rating

GPH

606.2

OSN

589.1

LOA

10.57 m

Displacement

3995 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6815

Medium

0.9051

High

1.0205

Triple Offshore

Low

0.8755

Medium

1.1123

High

1.2385

Boat Specifications

Dimensions

Length overall: 10.57 m
Beam: 3.35 m
Draft: 2.01 m
Displacement: 3995 kg
Crew weight: 500 kg
Wetted surface: 24.02 m²

Sails

Mainsail: 33.86 m²
Genoa: 38.84 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 87.12 m²

Design

Type: J 105
Builder: TPI
Designer: Johnstone
Year built: 1991
Stability index: 116.5

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.

6,42.7,5.034599,52,5.6,60,5.87,75,6.03,90,6.1,110,5.89,120,5.58,135,5.02,143.9,4.554512,150,4.25
8,40.5,5.904741,52,6.56,60,6.75,75,6.87,90,7.02,110,6.91,120,6.73,135,6.23,147.8,5.530652,150,5.41
10,38.2,6.349757,52,7.03,60,7.19,75,7.3,90,7.5,110,7.48,120,7.4,135,7.06,148.9,6.434908,150,6.36
12,37,6.523627,52,7.24,60,7.42,75,7.59,90,7.82,110,7.93,120,7.91,135,7.61,149.6,7.049164,150,7.02
14,36.6,6.639118,52,7.35,60,7.54,75,7.81,90,8.05,110,8.34,120,8.4,135,8.13,150,7.43,150.1,7.428797
16,36.4,6.721384,52,7.43,60,7.64,75,7.96,90,8.23,110,8.74,120,8.88,135,8.67,150,7.79,173.9,6.939291
20,36.3,6.799612,52,7.52,60,7.75,75,8.16,90,8.57,110,9.53,120,9.88,135,10.13,150,8.57,175.7,7.711707

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.6	5.87	6.03	6.1	5.89	5.58	5.02	4.25
8	6.56	6.75	6.87	7.02	6.91	6.73	6.23	5.41
10	7.03	7.19	7.3	7.5	7.48	7.4	7.06	6.36
12	7.24	7.42	7.59	7.82	7.93	7.91	7.61	7.02
14	7.35	7.54	7.81	8.05	8.34	8.4	8.13	7.43
16	7.43	7.64	7.96	8.23	8.74	8.88	8.67	7.79
20	7.52	7.75	8.16	8.57	9.53	9.88	10.13	8.57

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.7°	3.7	143.9°	3.68
8	40.5°	4.49	147.8°	4.68
10	38.2°	4.99	148.9°	5.51
12	37°	5.21	149.6°	6.08
14	36.6°	5.33	150.1°	6.44
16	36.4°	5.41	173.9°	6.9
20	36.3°	5.48	175.7°	7.69

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