Nuthr Witch — ORC Rating

GPH

659.3

OSN

637.5

LOA

10.53 m

Displacement

4230 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5997

Medium

0.8396

High

0.9803

Triple Offshore

Low

0.7795

Medium

1.0346

High

1.1719

Boat Specifications

Dimensions

Length overall: 10.53 m
Beam: 3.33 m
Draft: 1.93 m
Displacement: 4230 kg
Crew weight: 650 kg
Wetted surface: 23.96 m²

Sails

Mainsail: 31.94 m²
Genoa: 30.47 m²
Spinnaker: 64.49 m²
Asymmetric spinnaker: 0 m²

Design

Type: Lavranos 34
Builder: John Robertson Yac
Designer: Angelo Lavranos
Year built: 1986
Stability index: 118.4

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.

6,43.5,4.397729,52,4.92,60,5.22,75,5.45,90,5.36,110,5.28,120,5.09,135,4.56,146,3.968457,150,3.8
8,41.8,5.218143,52,5.88,60,6.19,75,6.41,90,6.37,110,6.42,120,6.23,135,5.63,150,4.87,150.5,4.848592
10,41.4,5.932455,52,6.55,60,6.75,75,6.9,90,6.99,110,7.04,120,6.94,135,6.54,150,5.81,152,5.708153
12,39.3,6.280366,52,6.89,60,7.05,75,7.19,90,7.33,110,7.43,120,7.34,135,7.05,150,6.61,157.4,6.293258
14,38.2,6.375207,52,7.04,60,7.22,75,7.43,90,7.55,110,7.86,120,7.75,135,7.43,150,7.07,170,6.529193
16,37.8,6.429118,52,7.1,60,7.31,75,7.64,90,7.78,110,8.27,120,8.21,135,7.85,150,7.43,178.1,6.923807
20,39,6.511003,52,7.13,60,7.36,75,7.82,90,8.28,110,8.8,120,9.17,135,8.81,150,8.25,178.4,7.622972

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.92	5.22	5.45	5.36	5.28	5.09	4.56	3.8
8	5.88	6.19	6.41	6.37	6.42	6.23	5.63	4.87
10	6.55	6.75	6.9	6.99	7.04	6.94	6.54	5.81
12	6.89	7.05	7.19	7.33	7.43	7.34	7.05	6.61
14	7.04	7.22	7.43	7.55	7.86	7.75	7.43	7.07
16	7.1	7.31	7.64	7.78	8.27	8.21	7.85	7.43
20	7.13	7.36	7.82	8.28	8.8	9.17	8.81	8.25

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.5°	3.19	146°	3.29
8	41.8°	3.89	150.5°	4.22
10	41.4°	4.45	152°	5.04
12	39.3°	4.86	157.4°	5.81
14	38.2°	5.01	170°	6.43
16	37.8°	5.08	178.1°	6.92
20	39°	5.06	178.4°	7.62

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