UNKNOWN LADY NAI: ORC Rating

GPH

546

OSN

533.1

LOA

12.518 m

Displacement

5568 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7684

Medium

1.0029

High

1.1393

Triple Offshore

Low

0.9873

Medium

1.2254

High

1.3631

Boat Specifications

Dimensions

Length overall: 12.518 m
Beam: 3.75 m
Draft: 2.77 m
Displacement: 5568 kg
Crew weight: 900 kg
Wetted surface: 31.39 m²

Sails

Mainsail: 49.76 m²
Genoa: 64.74 m²
Spinnaker: 123.76 m²
Asymmetric spinnaker: 98.46 m²

Design

Type: SYDNEY 41
Builder: BASHFORD
Designer: MURRAY
Year built: 1994
Stability index: 111.9

Performance data

Polar CSV

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

6,41.8,5.955926,52,6.66,60,6.95,75,7.12,90,6.98,110,6.47,120,6.1,135,5.45,142.2,5.011675,150,4.57
8,38.8,6.697993,52,7.49,60,7.69,75,7.81,90,7.75,110,7.56,120,7.36,135,6.78,146,6.079338,150,5.82
10,37,6.961874,52,7.78,60,7.98,75,8.19,90,8.2,110,8.15,120,8.05,135,7.68,150,6.89,150.5,6.859265
12,36.4,7.1438,52,7.94,60,8.14,75,8.42,90,8.57,110,8.64,120,8.59,135,8.25,150,7.67,156.5,7.349573
14,35.8,7.237408,52,8.04,60,8.25,75,8.58,90,8.86,110,9.11,120,9.09,135,8.8,150,8.21,164.6,7.623727
16,35.4,7.287201,52,8.11,60,8.33,75,8.69,90,9.06,110,9.55,120,9.63,135,9.39,150,8.72,175.4,7.925529
20,35.8,7.336044,52,8.17,60,8.42,75,8.85,90,9.33,110,10.25,120,10.71,135,10.89,150,9.93,175.7,8.874982

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	6.66	6.95	7.12	6.98	6.47	6.1	5.45	4.57
8	7.49	7.69	7.81	7.75	7.56	7.36	6.78	5.82
10	7.78	7.98	8.19	8.2	8.15	8.05	7.68	6.89
12	7.94	8.14	8.42	8.57	8.64	8.59	8.25	7.67
14	8.04	8.25	8.58	8.86	9.11	9.09	8.8	8.21
16	8.11	8.33	8.69	9.06	9.55	9.63	9.39	8.72
20	8.17	8.42	8.85	9.33	10.25	10.71	10.89	9.93

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.8°	4.44	142.2°	3.96
8	38.8°	5.22	146°	5.04
10	37°	5.56	150.5°	5.97
12	36.4°	5.75	156.5°	6.74
14	35.8°	5.87	164.6°	7.35
16	35.4°	5.94	175.4°	7.9
20	35.8°	5.95	175.7°	8.85

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°	6.66	7.49	7.78	7.94	8.04	8.11	8.17
60°	6.95	7.69	7.98	8.14	8.25	8.33	8.42
75°	7.12	7.81	8.19	8.42	8.58	8.69	8.85
90°	6.98	7.75	8.20	8.57	8.86	9.06	9.33
110°	6.47	7.56	8.15	8.64	9.11	9.55	10.25
120°	6.10	7.36	8.05	8.59	9.09	9.63	10.71
135°	5.45	6.78	7.68	8.25	8.80	9.39	10.89
150°	4.57	5.82	6.89	7.67	8.21	8.72	9.93