SINILIND — ORC Rating

GPH

823.2

OSN

795.9

LOA

7.306 m

Displacement

1689 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.4816

Medium

0.6677

High

0.7759

Triple Offshore

Low

0.6243

Medium

0.829

High

0.9362

Boat Specifications

Dimensions

Length overall: 7.306 m
Beam: 2.25 m
Draft: 1.09 m
Displacement: 1689 kg
Crew weight: 330 kg
Wetted surface: 13.03 m²

Sails

Mainsail: 11.31 m²
Genoa: 15.17 m²
Spinnaker: 33.21 m²
Asymmetric spinnaker: 0 m²

Design

Type: ROCK 20
Builder: Birka Marin
Year built: 1969
Stability index: 125.9

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.

6,45.7,3.422033,52,3.75,60,4.03,75,4.22,90,4.25,110,4.36,120,4.23,135,3.82,148.7,3.370554,150,3.32
8,44.2,4.045135,52,4.5,60,4.81,75,5.02,90,5.19,110,5.31,120,5.19,135,4.75,150,4.22,152.3,4.133755
10,44.2,4.575187,52,5.08,60,5.35,75,5.54,90,5.73,110,5.81,120,5.75,135,5.52,150,5.01,153.8,4.848102
12,43.8,5.001661,52,5.44,60,5.63,75,5.79,90,6,110,6.13,120,6.08,135,5.89,150,5.61,161.9,5.270823
14,42.7,5.197883,52,5.64,60,5.81,75,5.97,90,6.13,110,6.45,120,6.42,135,6.2,150,5.93,175.7,5.525554
16,42.3,5.232338,52,5.7,60,5.9,75,6.14,90,6.25,110,6.74,120,6.77,135,6.55,150,6.22,179,5.84089
20,43.5,5.224888,52,5.68,60,5.91,75,6.3,90,6.64,110,7.05,120,7.38,135,7.29,150,6.88,178.1,6.403521

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	3.75	4.03	4.22	4.25	4.36	4.23	3.82	3.32
8	4.5	4.81	5.02	5.19	5.31	5.19	4.75	4.22
10	5.08	5.35	5.54	5.73	5.81	5.75	5.52	5.01
12	5.44	5.63	5.79	6	6.13	6.08	5.89	5.61
14	5.64	5.81	5.97	6.13	6.45	6.42	6.2	5.93
16	5.7	5.9	6.14	6.25	6.74	6.77	6.55	6.22
20	5.68	5.91	6.3	6.64	7.05	7.38	7.29	6.88

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	45.7°	2.39	148.7°	2.88
8	44.2°	2.9	152.3°	3.66
10	44.2°	3.28	153.8°	4.35
12	43.8°	3.61	161.9°	5.01
14	42.7°	3.82	175.7°	5.51
16	42.3°	3.87	179°	5.84
20	43.5°	3.79	178.1°	6.4

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