Katwinchar — ORC Rating

GPH

711.4

OSN

692.5

LOA

10.02 m

Displacement

4786 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6343

Medium

0.8597

High

1.0059

Triple Offshore

Low

0.8248

Medium

1.0713

High

1.2086

Boat Specifications

Dimensions

Length overall: 10.02 m
Beam: 2.66 m
Draft: 1.63 m
Displacement: 4786 kg
Crew weight: 495 kg
Wetted surface: 21.27 m²

Sails

Mainsail: 22.82 m²
Genoa: 17.59 m²
Spinnaker: 54.91 m²
Asymmetric spinnaker: 50.12 m²

Design

Type: Watney 31 ft Rater
Builder: Whatford Brewerys
Designer: Whatford
Year built: 1904

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.

6,44.2,4.031186,52,4.49,60,4.82,75,5.13,90,5.13,110,5.06,120,4.89,135,4.45,146,3.968457,150,3.79
8,42.6,4.714052,52,5.31,60,5.68,75,6,90,6.06,110,6.09,120,5.92,135,5.41,150,4.74,150.3,4.720068
10,43.2,5.377461,52,5.98,60,6.26,75,6.45,90,6.57,110,6.62,120,6.54,135,6.23,150,5.55,151,5.499533
12,42.7,5.782985,52,6.33,60,6.54,75,6.7,90,6.85,110,6.93,120,6.87,135,6.66,150,6.25,155.3,6.009852
14,41.8,5.955926,52,6.5,60,6.7,75,6.89,90,7.04,110,7.21,120,7.16,135,6.95,150,6.64,166.6,6.157636
16,40.6,6.018929,52,6.59,60,6.79,75,7.04,90,7.28,110,7.49,120,7.47,135,7.24,150,6.91,180,6.44
20,40.4,6.092931,52,6.66,60,6.87,75,7.22,90,7.56,110,7.85,120,8.01,135,7.86,150,7.45,180,6.98

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.49	4.82	5.13	5.13	5.06	4.89	4.45	3.79
8	5.31	5.68	6	6.06	6.09	5.92	5.41	4.74
10	5.98	6.26	6.45	6.57	6.62	6.54	6.23	5.55
12	6.33	6.54	6.7	6.85	6.93	6.87	6.66	6.25
14	6.5	6.7	6.89	7.04	7.21	7.16	6.95	6.64
16	6.59	6.79	7.04	7.28	7.49	7.47	7.24	6.91
20	6.66	6.87	7.22	7.56	7.85	8.01	7.86	7.45

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	44.2°	2.89	146°	3.29
8	42.6°	3.47	150.3°	4.1
10	43.2°	3.92	151°	4.81
12	42.7°	4.25	155.3°	5.46
14	41.8°	4.44	166.6°	5.99
16	40.6°	4.57	180°	6.44
20	40.4°	4.64	180°	6.98

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