Sister Ray: ORC Rating

GPH

811

OSN

785.8

LOA

7.87 m

Displacement

2147 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5065

Medium

0.6832

High

0.7788

Triple Offshore

Low

0.6481

Medium

0.8351

High

0.9268

Boat Specifications

Dimensions

Length overall: 7.87 m
Beam: 2.2 m
Draft: 1.15 m
Displacement: 2147 kg
Crew weight: 275 kg
Wetted surface: 15.36 m²

Sails

Mainsail: 17.05 m²
Genoa: 15.39 m²
Spinnaker: 31.3 m²
Asymmetric spinnaker: 0 m²

Design

Type: IF
Builder: Marieholm
Designer: Tord Sunden
Year built: 1974

Performance data

Polar CSV

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

6,43.5,3.6395,52,4.04,60,4.25,75,4.37,90,4.37,110,4.4,120,4.25,135,3.83,148.4,3.369625,150,3.32
8,41.8,4.252317,52,4.74,60,4.94,75,5.08,90,5.18,110,5.23,120,5.1,135,4.7,150,4.2,153.2,4.089243
10,40.6,4.675536,52,5.19,60,5.36,75,5.5,90,5.65,110,5.71,120,5.63,135,5.35,150,4.92,158.2,4.641966
12,40.1,4.928611,52,5.44,60,5.6,75,5.76,90,5.9,110,6.03,120,5.96,135,5.76,150,5.45,170,4.985745
14,40.1,5.04627,52,5.57,60,5.74,75,5.93,90,6.05,110,6.28,120,6.24,135,6.05,150,5.81,177.4,5.405565
16,40.2,5.106075,52,5.64,60,5.82,75,6.05,90,6.17,110,6.49,120,6.5,135,6.33,150,6.08,179,5.750876
20,40.8,5.165159,52,5.69,60,5.89,75,6.19,90,6.43,110,6.78,120,6.97,135,6.9,150,6.61,179,6.270955
24,42,5.16723,52,5.68,60,5.91,75,6.26,90,6.58,110,6.96,120,7.31,135,7.51,150,7.17,179,6.771031

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.04	4.25	4.37	4.37	4.4	4.25	3.83	3.32
8	4.74	4.94	5.08	5.18	5.23	5.1	4.7	4.2
10	5.19	5.36	5.5	5.65	5.71	5.63	5.35	4.92
12	5.44	5.6	5.76	5.9	6.03	5.96	5.76	5.45
14	5.57	5.74	5.93	6.05	6.28	6.24	6.05	5.81
16	5.64	5.82	6.05	6.17	6.49	6.5	6.33	6.08
20	5.69	5.89	6.19	6.43	6.78	6.97	6.9	6.61
24	5.68	5.91	6.26	6.58	6.96	7.31	7.51	7.17

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.5°	2.64	148.4°	2.87
8	41.8°	3.17	153.2°	3.65
10	40.6°	3.55	158.2°	4.31
12	40.1°	3.77	170°	4.91
14	40.1°	3.86	177.4°	5.4
16	40.2°	3.9	179°	5.75
20	40.8°	3.91	179°	6.27
24	42°	3.84	179°	6.77

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 kt24 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)	Boat speed in 24 kt (kt)
0°	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
52°	4.04	4.74	5.19	5.44	5.57	5.64	5.69	5.68
60°	4.25	4.94	5.36	5.60	5.74	5.82	5.89	5.91
75°	4.37	5.08	5.50	5.76	5.93	6.05	6.19	6.26
90°	4.37	5.18	5.65	5.90	6.05	6.17	6.43	6.58
110°	4.40	5.23	5.71	6.03	6.28	6.49	6.78	6.96
120°	4.25	5.10	5.63	5.96	6.24	6.50	6.97	7.31
135°	3.83	4.70	5.35	5.76	6.05	6.33	6.90	7.51
150°	3.32	4.20	4.92	5.45	5.81	6.08	6.61	7.17