BLUE BIRD: ORC Rating

GPH

805.1

OSN

776.5

LOA

7.94 m

Displacement

1938 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.4836

Medium

0.6786

High

0.8319

Triple Offshore

Low

0.6265

Medium

0.8492

High

0.9968

Boat Specifications

Dimensions

Length overall: 7.94 m
Beam: 2.85 m
Draft: 1.49 m
Displacement: 1938 kg
Crew weight: 350 kg
Wetted surface: 14.14 m²

Sails

Mainsail: 11.43 m²
Genoa: 15.04 m²
Spinnaker: 36.6 m²
Asymmetric spinnaker: 0 m²

Design

Type: HIDDENSEE MODIF.
Builder: EIGENBAU
Designer: LOOS
Year built: 1974
Stability index: 91.7

Performance data

Polar CSV

Each row is TWS followed by TWA and boat-speed pairs. Paste it directly into Offwind or compatible navigation software.

6,44.8,3.424606,52,3.76,60,4,75,4.18,90,4.28,110,4.39,120,4.24,135,3.78,148.4,3.322661,150,3.27
8,43.6,4.087428,52,4.53,60,4.8,75,4.99,90,5.26,110,5.38,120,5.25,135,4.75,150,4.19,152,4.111229
10,43.6,4.625974,52,5.14,60,5.42,75,5.63,90,5.92,110,6.01,120,5.93,135,5.63,150,5.02,152,4.938005
12,43.5,5.073242,52,5.58,60,5.81,75,5.99,90,6.28,110,6.38,120,6.31,135,6.1,150,5.74,157.8,5.454326
14,42,5.355618,52,5.86,60,6.04,75,6.21,90,6.54,110,6.72,120,6.65,135,6.43,150,6.13,170.9,5.671381
16,40.2,5.564313,52,6.06,60,6.22,75,6.41,90,6.7,110,7.05,120,7.01,135,6.77,150,6.44,177.2,6.017184
20,39.4,5.68113,52,6.23,60,6.46,75,6.78,90,6.93,110,7.57,120,7.69,135,7.45,150,7.06,178.1,6.58362

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	3.76	4	4.18	4.28	4.39	4.24	3.78	3.27
8	4.53	4.8	4.99	5.26	5.38	5.25	4.75	4.19
10	5.14	5.42	5.63	5.92	6.01	5.93	5.63	5.02
12	5.58	5.81	5.99	6.28	6.38	6.31	6.1	5.74
14	5.86	6.04	6.21	6.54	6.72	6.65	6.43	6.13
16	6.06	6.22	6.41	6.7	7.05	7.01	6.77	6.44
20	6.23	6.46	6.78	6.93	7.57	7.69	7.45	7.06

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	44.8°	2.43	148.4°	2.83
8	43.6°	2.96	152°	3.63
10	43.6°	3.35	152°	4.36
12	43.5°	3.68	157.8°	5.05
14	42°	3.98	170.9°	5.6
16	40.2°	4.25	177.2°	6.01
20	39.4°	4.39	178.1°	6.58

VPP POLAR · BOAT SPEED BY TWAKT

TRUE WIND ANGLE —

READ AT ANGLE

Hover or tap the chart, or use the slider, to read boat speeds.

True wind speed 6 kt8 kt10 kt12 kt14 kt16 kt20 kt

Data table

Boat speed by true wind angle and true wind speed
TWA	Boat speed in 6 kt (kt)	Boat speed in 8 kt (kt)	Boat speed in 10 kt (kt)	Boat speed in 12 kt (kt)	Boat speed in 14 kt (kt)	Boat speed in 16 kt (kt)	Boat speed in 20 kt (kt)
0°	0.00	0.00	0.00	0.00	0.00	0.00	0.00
52°	3.76	4.53	5.14	5.58	5.86	6.06	6.23
60°	4.00	4.80	5.42	5.81	6.04	6.22	6.46
75°	4.18	4.99	5.63	5.99	6.21	6.41	6.78
90°	4.28	5.26	5.92	6.28	6.54	6.70	6.93
110°	4.39	5.38	6.01	6.38	6.72	7.05	7.57
120°	4.24	5.25	5.93	6.31	6.65	7.01	7.69
135°	3.78	4.75	5.63	6.10	6.43	6.77	7.45
150°	3.27	4.19	5.02	5.74	6.13	6.44	7.06