GRAMPUS II — ORC Rating

GPH

598.8

OSN

581.5

LOA

14.6 m

Displacement

14960 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.685

Medium

0.9193

High

1.064

Triple Offshore

Low

0.8783

Medium

1.1296

High

1.2597

Boat Specifications

Dimensions

Length overall: 14.6 m
Beam: 4.19 m
Draft: 2.37 m
Displacement: 14960 kg
Crew weight: 807 kg
Wetted surface: 42.85 m²

Sails

Mainsail: 50.37 m²
Genoa: 81.4 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 165.09 m²

Design

Type: Swan 47 (1975)
Builder: Nautor
Designer: S&S
Year built: 1975
Stability index: 144.4

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.

6,43,5.045438,52,5.61,60,5.89,75,6.07,90,5.95,110,5.79,120,5.66,135,5.13,144.2,4.648216,150,4.35
8,41.2,5.887709,52,6.56,60,6.81,75,6.97,90,6.9,110,6.96,120,6.82,135,6.31,147.8,5.613376,150,5.48
10,40,6.448712,52,7.16,60,7.36,75,7.51,90,7.49,110,7.66,120,7.59,135,7.23,150,6.44,150.2,6.430309
12,39.4,6.76818,52,7.48,60,7.66,75,7.82,90,7.85,110,8.05,120,8.04,135,7.8,150,7.23,155,6.962315
14,38.8,6.916127,52,7.64,60,7.83,75,8.02,90,8.09,110,8.34,120,8.37,135,8.19,150,7.76,163.1,7.24279
16,38.4,7.01805,52,7.74,60,7.93,75,8.17,90,8.28,110,8.57,120,8.66,135,8.51,150,8.12,174.5,7.514596
20,38.1,7.128924,52,7.83,60,8.04,75,8.33,90,8.57,110,8.87,120,9.13,135,9.11,150,8.74,178.4,8.223206

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.61	5.89	6.07	5.95	5.79	5.66	5.13	4.35
8	6.56	6.81	6.97	6.9	6.96	6.82	6.31	5.48
10	7.16	7.36	7.51	7.49	7.66	7.59	7.23	6.44
12	7.48	7.66	7.82	7.85	8.05	8.04	7.8	7.23
14	7.64	7.83	8.02	8.09	8.34	8.37	8.19	7.76
16	7.74	7.93	8.17	8.28	8.57	8.66	8.51	8.12
20	7.83	8.04	8.33	8.57	8.87	9.13	9.11	8.74

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43°	3.69	144.2°	3.77
8	41.2°	4.43	147.8°	4.75
10	40°	4.94	150.2°	5.58
12	39.4°	5.23	155°	6.31
14	38.8°	5.39	163.1°	6.93
16	38.4°	5.5	174.5°	7.48
20	38.1°	5.61	178.4°	8.22

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