MARIS: ORC Rating

GPH

767.5

OSN

743.3

LOA

11.15 m

Displacement

7892 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5073

Medium

0.7016

High

0.8344

Triple Offshore

Low

0.6617

Medium

0.891

High

1.0227

Boat Specifications

Dimensions

Length overall: 11.15 m
Beam: 2.9 m
Draft: 1.51 m
Displacement: 7892 kg
Crew weight: 484 kg
Wetted surface: 27.54 m²

Sails

Mainsail: 27.13 m²
Genoa: 29.54 m²
Spinnaker: 78.04 m²
Asymmetric spinnaker: 0 m²

Design

Type: Tasman Seabird
Builder: Jock Muir
Designer: Alan Payne
Year built: 1958
Stability index: 126.9

Performance data

Polar CSV

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

6,46,3.5701,52,3.89,60,4.21,75,4.45,90,4.58,110,4.77,120,4.63,135,4.17,145.7,3.72837,150,3.56
8,44.4,4.24089,52,4.67,60,4.99,75,5.25,90,5.55,110,5.79,120,5.67,135,5.16,149.6,4.510073,150,4.49
10,43.8,4.738416,52,5.26,60,5.61,75,5.98,90,6.32,110,6.54,120,6.47,135,6.1,148.4,5.436015,150,5.35
12,44.4,5.23463,52,5.8,60,6.15,75,6.48,90,6.64,110,6.91,120,6.87,135,6.66,150,6.14,152.5,6.02022
14,45.4,5.654038,52,6.16,60,6.47,75,6.75,90,6.89,110,7.15,120,7.15,135,6.98,150,6.64,158.6,6.315411
16,45.3,5.843092,52,6.32,60,6.63,75,6.91,90,7.07,110,7.27,120,7.41,135,7.25,150,6.94,168.2,6.466657
20,45.3,5.956826,52,6.44,60,6.74,75,7.07,90,7.36,110,7.47,120,7.7,135,7.79,150,7.43,178.4,6.942707

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	3.89	4.21	4.45	4.58	4.77	4.63	4.17	3.56
8	4.67	4.99	5.25	5.55	5.79	5.67	5.16	4.49
10	5.26	5.61	5.98	6.32	6.54	6.47	6.1	5.35
12	5.8	6.15	6.48	6.64	6.91	6.87	6.66	6.14
14	6.16	6.47	6.75	6.89	7.15	7.15	6.98	6.64
16	6.32	6.63	6.91	7.07	7.27	7.41	7.25	6.94
20	6.44	6.74	7.07	7.36	7.47	7.7	7.79	7.43

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	46°	2.48	145.7°	3.08
8	44.4°	3.03	149.6°	3.89
10	43.8°	3.42	148.4°	4.63
12	44.4°	3.74	152.5°	5.34
14	45.4°	3.97	158.6°	5.88
16	45.3°	4.11	168.2°	6.33
20	45.3°	4.19	178.4°	6.94

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°	3.89	4.67	5.26	5.80	6.16	6.32	6.44
60°	4.21	4.99	5.61	6.15	6.47	6.63	6.74
75°	4.45	5.25	5.98	6.48	6.75	6.91	7.07
90°	4.58	5.55	6.32	6.64	6.89	7.07	7.36
110°	4.77	5.79	6.54	6.91	7.15	7.27	7.47
120°	4.63	5.67	6.47	6.87	7.15	7.41	7.70
135°	4.17	5.16	6.10	6.66	6.98	7.25	7.79
150°	3.56	4.49	5.35	6.14	6.64	6.94	7.43