GRAMPUS II — ORC Rating

GPH

613.6

OSN

594.8

LOA

14.6 m

Displacement

14957 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6537

Medium

0.8916

High

1.0541

Triple Offshore

Low

0.8421

Medium

1.1077

High

1.2568

Boat Specifications

Dimensions

Length overall: 14.6 m
Beam: 4.19 m
Draft: 2.37 m
Displacement: 14957 kg
Crew weight: 827 kg
Wetted surface: 42.65 m²

Sails

Mainsail: 50.37 m²
Genoa: 55.61 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 165.09 m²

Design

Type: Swan 47 (1975)
Builder: Nautor
Designer: Sparkman&Stephens
Year built: 1975

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.

6,42.8,4.6066,52,5.16,60,5.44,75,5.66,90,5.69,110,5.79,120,5.65,135,5.12,145,4.590112,150,4.35
8,40.5,5.352404,52,6.06,60,6.37,75,6.62,90,6.84,110,7.01,120,6.83,135,6.23,150,5.43864
10,40.5,6.036249,52,6.85,60,7.14,75,7.36,90,7.59,110,7.74,120,7.65,135,7.23,150,6.38,151,6.311314
12,41.2,6.65856,52,7.35,60,7.57,75,7.74,90,7.91,110,8.11,120,8.06,135,7.81,150,7.23,153.5,7.050796
14,40.5,6.930508,52,7.6,60,7.8,75,7.97,90,8.05,110,8.41,120,8.39,135,8.17,150,7.79,162,7.307662
16,40.1,7.059549,52,7.74,60,7.95,75,8.15,90,8.22,110,8.63,120,8.71,135,8.49,150,8.12,180,7.54
20,39.8,7.171832,52,7.86,60,8.09,75,8.42,90,8.6,110,8.94,120,9.24,135,9.18,150,8.75,180,8.24

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.16	5.44	5.66	5.69	5.79	5.65	5.12	4.35
8	6.06	6.37	6.62	6.84	7.01	6.83	6.23	5.44
10	6.85	7.14	7.36	7.59	7.74	7.65	7.23	6.38
12	7.35	7.57	7.74	7.91	8.11	8.06	7.81	7.23
14	7.6	7.8	7.97	8.05	8.41	8.39	8.17	7.79
16	7.74	7.95	8.15	8.22	8.63	8.71	8.49	8.12
20	7.86	8.09	8.42	8.6	8.94	9.24	9.18	8.75

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.8°	3.38	145°	3.76
8	40.5°	4.07	150°	4.71
10	40.5°	4.59	151°	5.52
12	41.2°	5.01	153.5°	6.31
14	40.5°	5.27	162°	6.95
16	40.1°	5.4	180°	7.54
20	39.8°	5.51	180°	8.24

Loading polar chart…