WILLIAM MARTIN — ORC Rating

GPH

755.4

OSN

738.6

LOA

7.53 m

Displacement

1732 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5739

Medium

0.7358

High

0.8084

Triple Offshore

Low

0.7248

Medium

0.8818

High

0.9547

Boat Specifications

Dimensions

Length overall: 7.53 m
Beam: 2.64 m
Draft: 1.47 m
Displacement: 1732 kg
Crew weight: 230 kg
Wetted surface: 11.91 m²

Sails

Mainsail: 13.7 m²
Genoa: 22.29 m²
Spinnaker: 44.76 m²
Asymmetric spinnaker: 0 m²

Design

Type: ELVSTROM 1/4 TON
Builder: FIBRESTER
Designer: P. ELVSTROM
Year built: 1976

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.

6,40.5,4.024166,52,4.56,60,4.78,75,4.95,90,4.89,110,4.84,120,4.71,135,4.32,149.5,3.78353,150,3.76
8,40.5,4.721162,52,5.21,60,5.35,75,5.45,90,5.47,110,5.54,120,5.49,135,5.21,150,4.63,151,4.58485
10,39.2,5.019714,52,5.48,60,5.59,75,5.69,90,5.74,110,5.88,120,5.84,135,5.67,150,5.34,157,5.09503
12,38.6,5.131024,52,5.6,60,5.73,75,5.88,90,5.94,110,6.18,120,6.17,135,5.99,150,5.71,180,5.28
14,38.6,5.182206,52,5.66,60,5.82,75,6.04,90,6.15,110,6.42,120,6.48,135,6.33,150,6.01,180,5.66
16,38.6,5.195001,52,5.68,60,5.86,75,6.16,90,6.33,110,6.55,120,6.73,135,6.65,150,6.32,180,5.94
20,39.4,5.189369,52,5.66,60,5.86,75,6.24,90,6.57,110,6.74,120,6.99,135,7.17,150,6.91,180,6.54

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.56	4.78	4.95	4.89	4.84	4.71	4.32	3.76
8	5.21	5.35	5.45	5.47	5.54	5.49	5.21	4.63
10	5.48	5.59	5.69	5.74	5.88	5.84	5.67	5.34
12	5.6	5.73	5.88	5.94	6.18	6.17	5.99	5.71
14	5.66	5.82	6.04	6.15	6.42	6.48	6.33	6.01
16	5.68	5.86	6.16	6.33	6.55	6.73	6.65	6.32
20	5.66	5.86	6.24	6.57	6.74	6.99	7.17	6.91

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	40.5°	3.06	149.5°	3.26
8	40.5°	3.59	151°	4.01
10	39.2°	3.89	157°	4.69
12	38.6°	4.01	180°	5.28
14	38.6°	4.05	180°	5.66
16	38.6°	4.06	180°	5.94
20	39.4°	4.01	180°	6.54

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