WILLIAM MARTIN — ORC Rating

GPH

764.1

OSN

745.1

LOA

7.53 m

Displacement

1732 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5719

Medium

0.7289

High

0.8016

Triple Offshore

Low

0.7178

Medium

0.8714

High

0.9427

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: 11.6 m²

Sails

Mainsail: 13.08 m²
Genoa: 21.68 m²
Spinnaker: 45.43 m²
Asymmetric spinnaker: 0 m²

Design

Type: ELVSTROM 1/4 TON
Builder: FIBRESTER
Designer: P. ELVSTROM
Year built: 1976
Stability index: 113.4

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.

6,41.1,4.113788,52,4.58,60,4.75,75,4.84,90,4.74,110,4.75,120,4.63,135,4.24,148.4,3.72185,150,3.67
8,39,4.65807,52,5.16,60,5.28,75,5.36,90,5.34,110,5.46,120,5.4,135,5.1,150,4.57,152,4.484977
10,37.8,4.910429,52,5.42,60,5.53,75,5.63,90,5.65,110,5.81,120,5.8,135,5.61,150,5.26,157.2,5.01159
12,37.6,5.010794,52,5.54,60,5.67,75,5.81,90,5.87,110,6.08,120,6.1,135,5.95,150,5.68,171.8,5.233506
14,38.1,5.095719,52,5.6,60,5.74,75,5.95,90,6.05,110,6.3,120,6.37,135,6.27,150,5.99,178.1,5.593075
16,38.1,5.121134,52,5.63,60,5.79,75,6.04,90,6.2,110,6.44,120,6.6,135,6.57,150,6.28,179,5.890897
20,39,5.134171,52,5.65,60,5.83,75,6.14,90,6.41,110,6.66,120,6.96,135,7.18,150,6.88,179,6.440981

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.58	4.75	4.84	4.74	4.75	4.63	4.24	3.67
8	5.16	5.28	5.36	5.34	5.46	5.4	5.1	4.57
10	5.42	5.53	5.63	5.65	5.81	5.8	5.61	5.26
12	5.54	5.67	5.81	5.87	6.08	6.1	5.95	5.68
14	5.6	5.74	5.95	6.05	6.3	6.37	6.27	5.99
16	5.63	5.79	6.04	6.2	6.44	6.6	6.57	6.28
20	5.65	5.83	6.14	6.41	6.66	6.96	7.18	6.88

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.1°	3.1	148.4°	3.17
8	39°	3.62	152°	3.96
10	37.8°	3.88	157.2°	4.62
12	37.6°	3.97	171.8°	5.18
14	38.1°	4.01	178.1°	5.59
16	38.1°	4.03	179°	5.89
20	39°	3.99	179°	6.44

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