BLUE BIRD — ORC Rating

GPH

794.6

OSN

767

LOA

7.94 m

Displacement

1744 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5568

Medium

0.7738

High

0.9469

Triple Offshore

Low

0.7177

Medium

0.9651

High

1.1374

Boat Specifications

Dimensions

Length overall: 7.94 m
Beam: 2.85 m
Draft: 1.47 m
Displacement: 1744 kg
Crew weight: 450 kg
Wetted surface: 13.82 m²

Sails

Mainsail: 11.95 m²
Genoa: 15.43 m²
Spinnaker: 31.41 m²
Asymmetric spinnaker: 0 m²

Design

Type: HIDDENSEE MODIF.
Builder: EIGENBAU
Designer: LOOS
Year built: 1974

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.

6,44,3.475409,52,3.85,60,4.08,75,4.29,90,4.27,110,4.39,120,4.27,135,3.86,148.7,3.393961,150,3.35
8,42.9,4.136277,52,4.61,60,4.87,75,5.11,90,5.25,110,5.37,120,5.24,135,4.81,150,4.26,152,4.179183
10,43,4.662587,52,5.21,60,5.49,75,5.71,90,5.93,110,6,120,5.92,135,5.62,150,5.05,154.3,4.871948
12,43.2,5.144254,52,5.65,60,5.87,75,6.04,90,6.3,110,6.36,120,6.3,135,6.08,150,5.72,161.1,5.327215
14,41.7,5.437707,52,5.94,60,6.11,75,6.28,90,6.62,110,6.73,120,6.64,135,6.41,150,6.12,180,5.62
16,39.9,5.631121,52,6.14,60,6.32,75,6.51,90,6.88,110,7.09,120,7,135,6.76,150,6.42,180,6.03
20,39.3,5.737619,52,6.32,60,6.59,75,6.95,90,7.14,110,7.79,120,7.75,135,7.45,150,7.05,180,6.62

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	3.85	4.08	4.29	4.27	4.39	4.27	3.86	3.35
8	4.61	4.87	5.11	5.25	5.37	5.24	4.81	4.26
10	5.21	5.49	5.71	5.93	6	5.92	5.62	5.05
12	5.65	5.87	6.04	6.3	6.36	6.3	6.08	5.72
14	5.94	6.11	6.28	6.62	6.73	6.64	6.41	6.12
16	6.14	6.32	6.51	6.88	7.09	7	6.76	6.42
20	6.32	6.59	6.95	7.14	7.79	7.75	7.45	7.05

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	44°	2.5	148.7°	2.9
8	42.9°	3.03	152°	3.69
10	43°	3.41	154.3°	4.39
12	43.2°	3.75	161.1°	5.04
14	41.7°	4.06	180°	5.62
16	39.9°	4.32	180°	6.03
20	39.3°	4.44	180°	6.62

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