Ilona Tuulikki — ORC Rating

GPH

729

OSN

707

LOA

9.345 m

Displacement

3745 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5629

Medium

0.7593

High

0.8717

Triple Offshore

Low

0.719

Medium

0.9294

High

1.0331

Boat Specifications

Dimensions

Length overall: 9.345 m
Beam: 2.68 m
Draft: 1.69 m
Displacement: 3745 kg
Crew weight: 370 kg
Wetted surface: 17.93 m²

Sails

Mainsail: 17.62 m²
Genoa: 28.87 m²
Spinnaker: 59.56 m²
Asymmetric spinnaker: 0 m²

Design

Type: IW 31
Builder: IW Varvet
Designer: Sparkman&Stephens
Year built: 1975
Stability index: 126.4

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.

6,42.3,3.988475,52,4.46,60,4.69,75,4.85,90,4.78,110,4.81,120,4.68,135,4.29,147.8,3.79346,150,3.71
8,40.8,4.623544,52,5.25,60,5.51,75,5.7,90,5.68,110,5.83,120,5.7,135,5.24,150,4.63,152.3,4.540353
10,41.7,5.29038,52,5.83,60,6.01,75,6.15,90,6.24,110,6.34,120,6.28,135,6.03,150,5.46,152,5.368382
12,40.6,5.584302,52,6.11,60,6.26,75,6.39,90,6.46,110,6.65,120,6.62,135,6.43,150,6.1,159.2,5.776478
14,40,5.691576,52,6.25,60,6.41,75,6.57,90,6.63,110,6.92,120,6.92,135,6.73,150,6.45,173.6,5.977251
16,39.9,5.774506,52,6.31,60,6.49,75,6.72,90,6.82,110,7.1,120,7.21,135,7.05,150,6.73,179,6.330964
20,40.2,5.81307,52,6.36,60,6.55,75,6.88,90,7.14,110,7.34,120,7.59,135,7.64,150,7.32,179,6.871046

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.46	4.69	4.85	4.78	4.81	4.68	4.29	3.71
8	5.25	5.51	5.7	5.68	5.83	5.7	5.24	4.63
10	5.83	6.01	6.15	6.24	6.34	6.28	6.03	5.46
12	6.11	6.26	6.39	6.46	6.65	6.62	6.43	6.1
14	6.25	6.41	6.57	6.63	6.92	6.92	6.73	6.45
16	6.31	6.49	6.72	6.82	7.1	7.21	7.05	6.73
20	6.36	6.55	6.88	7.14	7.34	7.59	7.64	7.32

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.3°	2.95	147.8°	3.21
8	40.8°	3.5	152.3°	4.02
10	41.7°	3.95	152°	4.74
12	40.6°	4.24	159.2°	5.4
14	40°	4.36	173.6°	5.94
16	39.9°	4.43	179°	6.33
20	40.2°	4.44	179°	6.87

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