IRS CHALLENGER — ORC Rating

GPH

713.2

OSN

691.2

LOA

9.957 m

Displacement

4310 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5524

Medium

0.7609

High

0.9028

Triple Offshore

Low

0.7181

Medium

0.956

High

1.0943

Boat Specifications

Dimensions

Length overall: 9.957 m
Beam: 3.41 m
Draft: 1.76 m
Displacement: 4310 kg
Crew weight: 560 kg
Wetted surface: 22.63 m²

Sails

Mainsail: 27.64 m²
Genoa: 19.4 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 53.22 m²

Design

Type: OPTIMA 101
Builder: DEHLER
Designer: V.DE STADT
Year built: 1985
Stability index: 106.2

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.

6,45,3.945656,52,4.32,60,4.59,75,4.79,90,5.03,110,5.03,120,4.85,135,4.37,146,3.896084,150,3.73
8,43.2,4.677842,52,5.2,60,5.49,75,5.71,90,6.1,110,6.13,120,5.93,135,5.41,147.1,4.859342,150,4.72
10,42.6,5.271044,52,5.88,60,6.16,75,6.4,90,6.7,110,6.74,120,6.63,135,6.28,146.6,5.749551,150,5.54
12,42,5.759308,52,6.34,60,6.54,75,6.73,90,7.03,110,7.1,120,7.02,135,6.77,147.9,6.339111,150,6.2
14,40.2,6.009458,52,6.6,60,6.77,75,6.92,90,7.28,110,7.44,120,7.37,135,7.11,150,6.61,165.8,5.931227
16,39.9,6.178591,52,6.74,60,6.92,75,7.12,90,7.43,110,7.8,120,7.74,135,7.45,150,6.89,174.5,6.339184
20,40.2,6.23203,52,6.81,60,7.04,75,7.43,90,7.66,110,8.34,120,8.46,135,8.17,150,7.41,177.2,6.968319

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.32	4.59	4.79	5.03	5.03	4.85	4.37	3.73
8	5.2	5.49	5.71	6.1	6.13	5.93	5.41	4.72
10	5.88	6.16	6.4	6.7	6.74	6.63	6.28	5.54
12	6.34	6.54	6.73	7.03	7.1	7.02	6.77	6.2
14	6.6	6.77	6.92	7.28	7.44	7.37	7.11	6.61
16	6.74	6.92	7.12	7.43	7.8	7.74	7.45	6.89
20	6.81	7.04	7.43	7.66	8.34	8.46	8.17	7.41

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	45°	2.79	146°	3.23
8	43.2°	3.41	147.1°	4.08
10	42.6°	3.88	146.6°	4.8
12	42°	4.28	147.9°	5.37
14	40.2°	4.59	165.8°	5.75
16	39.9°	4.74	174.5°	6.31
20	40.2°	4.76	177.2°	6.96

Loading polar chart…