Cirrus III — ORC Rating

GPH

709.7

OSN

690.5

LOA

9.684 m

Displacement

3937 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5737

Medium

0.7755

High

0.8946

Triple Offshore

Low

0.7389

Medium

0.9537

High

1.0647

Boat Specifications

Dimensions

Length overall: 9.684 m
Beam: 2.74 m
Draft: 1.49 m
Displacement: 3937 kg
Crew weight: 459 kg
Wetted surface: 18.68 m²

Sails

Mainsail: 18.2 m²
Genoa: 31.92 m²
Spinnaker: 67.85 m²
Asymmetric spinnaker: 0 m²

Design

Type: Selecta 31
Builder: Van de Stadt
Designer: Van de Stadt
Year built: 1970

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.

6,43.1,4.108676,52,4.58,60,4.87,75,5.09,90,5.02,110,5,120,4.85,135,4.44,148,3.891289,150,3.81
8,42,4.776996,52,5.39,60,5.7,75,5.93,90,5.9,110,6.02,120,5.92,135,5.43,150,4.74,152,4.654863
10,42.8,5.437969,52,5.99,60,6.2,75,6.35,90,6.4,110,6.53,120,6.48,135,6.24,150,5.623392
12,41.6,5.763588,52,6.29,60,6.45,75,6.59,90,6.65,110,6.84,120,6.81,135,6.62,150,6.28,159.5,5.935908
14,40.9,5.900615,52,6.43,60,6.6,75,6.77,90,6.81,110,7.13,120,7.13,135,6.93,150,6.62,180,6.13
16,40.5,5.957344,52,6.49,60,6.68,75,6.92,90,7,110,7.35,120,7.45,135,7.26,150,6.9,180,6.51
20,40.5,5.996797,52,6.53,60,6.74,75,7.09,90,7.34,110,7.61,120,7.9,135,7.89,150,7.51,180,7.06

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.58	4.87	5.09	5.02	5	4.85	4.44	3.81
8	5.39	5.7	5.93	5.9	6.02	5.92	5.43	4.74
10	5.99	6.2	6.35	6.4	6.53	6.48	6.24	5.62
12	6.29	6.45	6.59	6.65	6.84	6.81	6.62	6.28
14	6.43	6.6	6.77	6.81	7.13	7.13	6.93	6.62
16	6.49	6.68	6.92	7	7.35	7.45	7.26	6.9
20	6.53	6.74	7.09	7.34	7.61	7.9	7.89	7.51

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.1°	3	148°	3.3
8	42°	3.55	152°	4.11
10	42.8°	3.99	150°	4.87
12	41.6°	4.31	159.5°	5.56
14	40.9°	4.46	180°	6.13
16	40.5°	4.53	180°	6.51
20	40.5°	4.56	180°	7.06

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