Alfa Scorpii — ORC Rating

GPH

759.6

OSN

734.9

LOA

7.57 m

Displacement

1265 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5353

Medium

0.7312

High

0.8422

Triple Offshore

Low

0.6878

Medium

0.8925

High

1.0045

Boat Specifications

Dimensions

Length overall: 7.57 m
Beam: 2.49 m
Draft: 1.5 m
Displacement: 1265 kg
Crew weight: 340 kg
Wetted surface: 11 m²

Sails

Mainsail: 13.63 m²
Genoa: 10.34 m²
Spinnaker: 24.07 m²
Asymmetric spinnaker: 34.7 m²

Design

Type: Smokey 25
Builder: David Garrard Yach
Designer: Steven Joanes
Year built: 1979
Stability index: 109.8

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.

6,42,3.754315,52,4.19,60,4.38,75,4.48,90,4.79,110,4.81,120,4.55,135,4.09,145.7,3.655739,150,3.49
8,40.6,4.451637,52,4.98,60,5.16,75,5.34,90,5.62,110,5.65,120,5.53,135,5.07,150,4.42,150.5,4.4005
10,39.4,4.930548,52,5.47,60,5.62,75,5.78,90,6.05,110,6.11,120,6.02,135,5.77,150,5.23,153.2,5.086346
12,38.1,5.184672,52,5.73,60,5.87,75,6.01,90,6.33,110,6.48,120,6.4,135,6.16,150,5.81,164,5.409557
14,37.5,5.344403,52,5.9,60,6.04,75,6.21,90,6.54,110,6.81,120,6.78,135,6.51,150,6.16,176.6,5.710051
16,37.5,5.407427,52,5.99,60,6.17,75,6.39,90,6.66,110,7.12,120,7.17,135,6.87,150,6.49,179,6.060923
20,38.2,5.459009,52,6.06,60,6.27,75,6.62,90,6.86,110,7.75,120,8.19,135,7.88,150,7.2,178.4,6.672602

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.19	4.38	4.48	4.79	4.81	4.55	4.09	3.49
8	4.98	5.16	5.34	5.62	5.65	5.53	5.07	4.42
10	5.47	5.62	5.78	6.05	6.11	6.02	5.77	5.23
12	5.73	5.87	6.01	6.33	6.48	6.4	6.16	5.81
14	5.9	6.04	6.21	6.54	6.81	6.78	6.51	6.16
16	5.99	6.17	6.39	6.66	7.12	7.17	6.87	6.49
20	6.06	6.27	6.62	6.86	7.75	8.19	7.88	7.2

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42°	2.79	145.7°	3.02
8	40.6°	3.38	150.5°	3.83
10	39.4°	3.81	153.2°	4.54
12	38.1°	4.08	164°	5.2
14	37.5°	4.24	176.6°	5.7
16	37.5°	4.29	179°	6.06
20	38.2°	4.29	178.4°	6.67

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