Roller ski — ORC Rating

GPH

668.4

OSN

655.4

LOA

10.1 m

Displacement

3241 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6349

Medium

0.8155

High

0.9016

Triple Offshore

Low

0.8147

Medium

0.9991

High

1.0847

Boat Specifications

Dimensions

Length overall: 10.1 m
Beam: 3.47 m
Draft: 1.7 m
Displacement: 3241 kg
Crew weight: 456 kg
Wetted surface: 19.05 m²

Sails

Mainsail: 37.43 m²
Genoa: 23.27 m²
Spinnaker: 60.42 m²
Asymmetric spinnaker: 0 m²

Design

Type: 3/4 ton
Builder: One Off
Designer: Robert Humphreys
Year built: 1984

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.

6,42,4.534782,52,5.1,60,5.4,75,5.65,90,5.6,110,5.56,120,5.38,135,4.87,147,4.280584,150,4.14
8,41.2,5.302925,52,5.94,60,6.16,75,6.33,90,6.36,110,6.44,120,6.34,135,5.92,150,5.15,150.5,5.124342
10,40.5,5.641723,52,6.26,60,6.45,75,6.64,90,6.7,110,6.88,120,6.81,135,6.52,150,6.02,154.2,5.842375
12,40.3,5.742994,52,6.36,60,6.56,75,6.84,90,6.98,110,7.25,120,7.24,135,6.94,150,6.56,170,6.011326
14,41.2,5.821256,52,6.39,60,6.61,75,6.95,90,7.22,110,7.5,120,7.61,135,7.36,150,6.95,180,6.47
16,40.9,5.927075,52,6.46,60,6.63,75,7.02,90,7.39,110,7.68,120,7.91,135,7.77,150,7.35,180,6.85
20,43.1,5.943884,52,6.46,60,6.72,75,7.13,90,7.54,110,7.88,120,8.27,135,8.55,150,8.12,180,7.61

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.1	5.4	5.65	5.6	5.56	5.38	4.87	4.14
8	5.94	6.16	6.33	6.36	6.44	6.34	5.92	5.15
10	6.26	6.45	6.64	6.7	6.88	6.81	6.52	6.02
12	6.36	6.56	6.84	6.98	7.25	7.24	6.94	6.56
14	6.39	6.61	6.95	7.22	7.5	7.61	7.36	6.95
16	6.46	6.63	7.02	7.39	7.68	7.91	7.77	7.35
20	6.46	6.72	7.13	7.54	7.88	8.27	8.55	8.12

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42°	3.37	147°	3.59
8	41.2°	3.99	150.5°	4.46
10	40.5°	4.29	154.2°	5.26
12	40.3°	4.38	170°	5.92
14	41.2°	4.38	180°	6.47
16	40.9°	4.48	180°	6.85
20	43.1°	4.34	180°	7.61

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