NITRO 31 — ORC Rating

GPH

549.8

OSN

533.3

LOA

9.573 m

Displacement

1840 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7473

Medium

0.9828

High

1.1603

Triple Offshore

Low

0.9561

Medium

1.2237

High

1.4233

Boat Specifications

Dimensions

Length overall: 9.573 m
Beam: 3.05 m
Draft: 2.44 m
Displacement: 1840 kg
Crew weight: 600 kg
Wetted surface: 20.52 m²

Sails

Mainsail: 37.6 m²
Genoa: 23.55 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 116.64 m²

Design

Type: Cape 31
Builder: Noordhoek
Designer: Mills
Year built: 2017
Stability index: 109.9

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.

6,42.4,5.416712,52,6.04,60,6.34,75,6.53,90,6.38,110,6.48,120,6.35,135,5.64,142.6,5.161033,150,4.73
8,39.6,6.268549,52,7.02,60,7.23,75,7.36,90,7.3,110,7.58,120,7.53,135,7.08,145.6,6.326402,150,6.03
10,38.2,6.629706,52,7.43,60,7.74,75,8.08,90,8.01,110,8.33,120,8.53,135,8.05,148.8,7.154847,150,7.07
12,37.5,6.793946,52,7.65,60,8.02,75,8.58,90,8.83,110,8.89,120,9.31,135,9.17,149.6,8.034655,150,8
14,37,6.874225,52,7.8,60,8.21,75,8.87,90,9.47,110,9.42,120,9.98,135,10.43,146,9.396438,150,9
16,36.9,6.940236,52,7.91,60,8.34,75,9.09,90,9.87,110,9.93,120,10.62,135,11.65,145.6,10.677319,150,10.18
20,37,6.999438,52,8.03,60,8.5,75,9.4,90,10.44,110,11.73,120,11.86,135,13.46,145.1,14.107143,150,13.36

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	6.04	6.34	6.53	6.38	6.48	6.35	5.64	4.73
8	7.02	7.23	7.36	7.3	7.58	7.53	7.08	6.03
10	7.43	7.74	8.08	8.01	8.33	8.53	8.05	7.07
12	7.65	8.02	8.58	8.83	8.89	9.31	9.17	8
14	7.8	8.21	8.87	9.47	9.42	9.98	10.43	9
16	7.91	8.34	9.09	9.87	9.93	10.62	11.65	10.18
20	8.03	8.5	9.4	10.44	11.73	11.86	13.46	13.36

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.4°	4	142.6°	4.1
8	39.6°	4.83	145.6°	5.22
10	38.2°	5.21	148.8°	6.12
12	37.5°	5.39	149.6°	6.93
14	37°	5.49	146°	7.79
16	36.9°	5.55	145.6°	8.81
20	37°	5.59	145.1°	11.57

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