Witchie — ORC Rating | RegattaPages

GPH

743.4

OSN

726.5

LOA

6.8 m

Displacement

958 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5706

Medium

0.7424

High

0.8156

Triple Offshore

Low

0.728

Medium

0.9003

High

0.983

Boat Specifications

Dimensions

Length overall: 6.8 m
Beam: 2.5 m
Draft: 1.43 m
Displacement: 958 kg
Crew weight: 258 kg
Wetted surface: 9.46 m²

Sails

Mainsail: 17.63 m²
Genoa: 13.08 m²
Spinnaker: 26.64 m²
Asymmetric spinnaker: 0 m²

Design

Type: HERO 70 (MINITON)
Builder: Hero
Designer: Eivind Amble
Year built: 1985

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.

6,41.2,4.133358,52,4.71,60,4.95,75,5.1,90,5.03,110,4.9,120,4.71,135,4.2,150,3.602666
8,40.5,4.865822,52,5.34,60,5.48,75,5.6,90,5.61,110,5.61,120,5.5,135,5.12,150,4.5,152.5,4.39679
10,38.2,5.089985,52,5.61,60,5.76,75,5.91,90,6,110,6.06,120,5.95,135,5.67,150,5.27,159,4.959401
12,38.1,5.184672,52,5.72,60,5.92,75,6.17,90,6.28,110,6.45,120,6.37,135,6.09,150,5.74,180,5.28
14,38.2,5.191785,52,5.77,60,5.99,75,6.31,90,6.5,110,6.8,120,6.74,135,6.47,150,6.13,180,5.71
16,39,5.211376,52,5.79,60,6.03,75,6.39,90,6.69,110,7.09,120,7.15,135,6.85,150,6.48,180,6.09
20,40.9,5.265571,52,5.82,60,6.09,75,6.43,90,6.85,110,7.47,120,7.97,135,7.88,150,7.25,180,6.77

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.71	4.95	5.1	5.03	4.9	4.71	4.2	3.6
8	5.34	5.48	5.6	5.61	5.61	5.5	5.12	4.5
10	5.61	5.76	5.91	6	6.06	5.95	5.67	5.27
12	5.72	5.92	6.17	6.28	6.45	6.37	6.09	5.74
14	5.77	5.99	6.31	6.5	6.8	6.74	6.47	6.13
16	5.79	6.03	6.39	6.69	7.09	7.15	6.85	6.48
20	5.82	6.09	6.43	6.85	7.47	7.97	7.88	7.25

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.2°	3.11	150°	3.12
8	40.5°	3.7	152.5°	3.9
10	38.2°	4	159°	4.63
12	38.1°	4.08	180°	5.28
14	38.2°	4.08	180°	5.71
16	39°	4.05	180°	6.09
20	40.9°	3.98	180°	6.77

Loading polar chart…