Ilona Tuulikki — ORC Rating

GPH

724.5

OSN

704.6

LOA

9.42 m

Displacement

3746 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5688

Medium

0.7622

High

0.8708

Triple Offshore

Low

0.7268

Medium

0.9333

High

1.0347

Boat Specifications

Dimensions

Length overall: 9.42 m
Beam: 2.68 m
Draft: 1.69 m
Displacement: 3746 kg
Crew weight: 368 kg
Wetted surface: 18.07 m²

Sails

Mainsail: 17.59 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

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.

6,41.6,4.011778,52,4.52,60,4.75,75,4.93,90,4.86,110,4.85,120,4.72,135,4.33,148,3.820538,150,3.74
8,40.7,4.669357,52,5.3,60,5.57,75,5.76,90,5.73,110,5.86,120,5.74,135,5.28,150,4.65,152,4.564257
10,41.2,5.289635,52,5.86,60,6.04,75,6.18,90,6.25,110,6.36,120,6.31,135,6.05,150,5.47,152,5.379708
12,40.5,5.58912,52,6.13,60,6.28,75,6.41,90,6.46,110,6.67,120,6.63,135,6.44,150,6.1,160,5.74656
14,40.1,5.699932,52,6.25,60,6.42,75,6.59,90,6.65,110,6.93,120,6.93,135,6.74,150,6.45,180,5.98
16,39.9,5.748436,52,6.3,60,6.49,75,6.73,90,6.83,110,7.1,120,7.23,135,7.05,150,6.72,180,6.35
20,40.5,5.786383,52,6.33,60,6.53,75,6.86,90,7.15,110,7.35,120,7.6,135,7.64,150,7.3,180,6.89

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.52	4.75	4.93	4.86	4.85	4.72	4.33	3.74
8	5.3	5.57	5.76	5.73	5.86	5.74	5.28	4.65
10	5.86	6.04	6.18	6.25	6.36	6.31	6.05	5.47
12	6.13	6.28	6.41	6.46	6.67	6.63	6.44	6.1
14	6.25	6.42	6.59	6.65	6.93	6.93	6.74	6.45
16	6.3	6.49	6.73	6.83	7.1	7.23	7.05	6.72
20	6.33	6.53	6.86	7.15	7.35	7.6	7.64	7.3

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.6°	3	148°	3.24
8	40.7°	3.54	152°	4.03
10	41.2°	3.98	152°	4.75
12	40.5°	4.25	160°	5.4
14	40.1°	4.36	180°	5.98
16	39.9°	4.41	180°	6.35
20	40.5°	4.4	180°	6.89

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