Nuthr Witch: ORC Rating

GPH

661.4

OSN

641.1

LOA

10.53 m

Displacement

4230 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6715

Medium

0.9342

High

1.0982

Triple Offshore

Low

0.8755

Medium

1.1578

High

1.321

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: 23.94 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

Performance data

Polar CSV

Each row is TWS followed by TWA and boat-speed pairs. Paste it directly into Offwind or compatible navigation software.

6,43.7,4.384708,52,4.89,60,5.21,75,5.51,90,5.49,110,5.26,120,5.08,135,4.55,146.6,3.952816,150,3.81
8,42.3,5.191777,52,5.85,60,6.2,75,6.47,90,6.46,110,6.4,120,6.21,135,5.61,150,4.86,150.9,4.818189
10,42.2,5.871994,52,6.53,60,6.77,75,6.96,90,7,110,7.02,120,6.91,135,6.53,150,5.79,151.9,5.690791
12,40.6,6.269169,52,6.89,60,7.08,75,7.26,90,7.37,110,7.41,120,7.31,135,7.04,150,6.59,157.8,6.242773
14,39.3,6.396669,52,7.05,60,7.27,75,7.53,90,7.59,110,7.85,120,7.71,135,7.4,150,7.05,175.8,6.457341
16,39.2,6.490787,52,7.13,60,7.36,75,7.77,90,7.89,110,8.32,120,8.17,135,7.8,150,7.39,180,6.93
20,39.5,6.544633,52,7.18,60,7.43,75,7.97,90,8.44,110,8.83,120,9.23,135,8.74,150,8.18,180,7.62

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.89	5.21	5.51	5.49	5.26	5.08	4.55	3.81
8	5.85	6.2	6.47	6.46	6.4	6.21	5.61	4.86
10	6.53	6.77	6.96	7	7.02	6.91	6.53	5.79
12	6.89	7.08	7.26	7.37	7.41	7.31	7.04	6.59
14	7.05	7.27	7.53	7.59	7.85	7.71	7.4	7.05
16	7.13	7.36	7.77	7.89	8.32	8.17	7.8	7.39
20	7.18	7.43	7.97	8.44	8.83	9.23	8.74	8.18

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.7°	3.17	146.6°	3.3
8	42.3°	3.84	150.9°	4.21
10	42.2°	4.35	151.9°	5.02
12	40.6°	4.76	157.8°	5.78
14	39.3°	4.95	175.8°	6.44
16	39.2°	5.03	180°	6.93
20	39.5°	5.05	180°	7.62

VPP POLAR · BOAT SPEED BY TWAKT

TRUE WIND ANGLE —

READ AT ANGLE

Hover or tap the chart, or use the slider, to read boat speeds.

True wind speed 6 kt8 kt10 kt12 kt14 kt16 kt20 kt

Data table

Boat speed by true wind angle and true wind speed
TWA	Boat speed in 6 kt (kt)	Boat speed in 8 kt (kt)	Boat speed in 10 kt (kt)	Boat speed in 12 kt (kt)	Boat speed in 14 kt (kt)	Boat speed in 16 kt (kt)	Boat speed in 20 kt (kt)
0°	0.00	0.00	0.00	0.00	0.00	0.00	0.00
52°	4.89	5.85	6.53	6.89	7.05	7.13	7.18
60°	5.21	6.20	6.77	7.08	7.27	7.36	7.43
75°	5.51	6.47	6.96	7.26	7.53	7.77	7.97
90°	5.49	6.46	7.00	7.37	7.59	7.89	8.44
110°	5.26	6.40	7.02	7.41	7.85	8.32	8.83
120°	5.08	6.21	6.91	7.31	7.71	8.17	9.23
135°	4.55	5.61	6.53	7.04	7.40	7.80	8.74
150°	3.81	4.86	5.79	6.59	7.05	7.39	8.18