SPITHA — ORC Rating | RegattaPages

GPH

761.7

OSN

733.7

LOA

9.08 m

Displacement

4174 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5774

Medium

0.8191

High

0.9931

Triple Offshore

Low

0.7462

Medium

1.0107

High

1.1741

Boat Specifications

Dimensions

Length overall: 9.08 m
Beam: 3.3 m
Draft: 1.83 m
Displacement: 4174 kg
Crew weight: 535 kg
Wetted surface: 21.05 m²

Sails

Mainsail: 20.86 m²
Genoa: 24.22 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 0 m²

Design

Type: GIBSEA 312
Builder: GIBSEA MARINE
Designer: HUMPHREYS
Year built: 1991

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.

6,43.9,3.941428,52,4.36,60,4.61,75,4.79,90,4.73,110,4.34,120,4.06,135,3.56,150,3.08,158.9,2.883316
8,42.2,4.630101,52,5.18,60,5.46,75,5.66,90,5.6,110,5.25,120,4.96,135,4.49,150,4.01,165.5,3.646138
10,41.6,5.175194,52,5.81,60,6.06,75,6.24,90,6.23,110,6.01,120,5.74,135,5.25,150,4.78,171,4.333351
12,41,5.631305,52,6.21,60,6.38,75,6.53,90,6.56,110,6.45,120,6.3,135,5.93,150,5.45,173.5,4.97196
14,39.4,5.875246,52,6.43,60,6.58,75,6.72,90,6.79,110,6.72,120,6.62,135,6.39,150,6.05,174.1,5.579556
16,38.6,5.988327,52,6.56,60,6.72,75,6.9,90,7.03,110,6.96,120,6.86,135,6.67,150,6.45,177.4,6.096276
20,38.6,6.013918,52,6.63,60,6.84,75,7.19,90,7.47,110,7.48,120,7.37,135,7.14,150,6.93,179.3,6.7005

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.36	4.61	4.79	4.73	4.34	4.06	3.56	3.08
8	5.18	5.46	5.66	5.6	5.25	4.96	4.49	4.01
10	5.81	6.06	6.24	6.23	6.01	5.74	5.25	4.78
12	6.21	6.38	6.53	6.56	6.45	6.3	5.93	5.45
14	6.43	6.58	6.72	6.79	6.72	6.62	6.39	6.05
16	6.56	6.72	6.9	7.03	6.96	6.86	6.67	6.45
20	6.63	6.84	7.19	7.47	7.48	7.37	7.14	6.93

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.9°	2.84	158.9°	2.69
8	42.2°	3.43	165.5°	3.53
10	41.6°	3.87	171°	4.28
12	41°	4.25	173.5°	4.94
14	39.4°	4.54	174.1°	5.55
16	38.6°	4.68	177.4°	6.09
20	38.6°	4.7	179.3°	6.7

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