BIRBIRICHO: ORC Rating

GPH

693.9

OSN

673.8

LOA

10.9 m

Displacement

7177 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5721

Medium

0.7866

High

0.9096

Triple Offshore

Low

0.7469

Medium

0.9813

High

1.0984

Boat Specifications

Dimensions

Length overall: 10.9 m
Beam: 3.77 m
Draft: 1.53 m
Displacement: 7177 kg
Crew weight: 550 kg
Wetted surface: 28.71 m²

Sails

Mainsail: 31.55 m²
Genoa: 41.99 m²
Spinnaker: 84.78 m²
Asymmetric spinnaker: 0 m²

Design

Type: WESTERLY 36 CONWAY
Builder: WESTERLY
Designer: ED.DUBOIS
Year built: 1980
Stability index: 124.8

Performance data

Polar CSV

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

6,47.4,4.313937,52,4.62,60,5,75,5.28,90,5.23,110,5.12,120,4.98,135,4.49,146.9,3.915395,150,3.79
8,45.6,5.073869,52,5.54,60,5.89,75,6.15,90,6.16,110,6.21,120,6.08,135,5.57,150,4.88,151.4,4.817861
10,45,5.656854,52,6.16,60,6.45,75,6.67,90,6.73,110,6.86,120,6.79,135,6.44,150,5.81,153.8,5.628256
12,44.7,6.00732,52,6.5,60,6.75,75,6.96,90,7.05,110,7.24,120,7.2,135,6.97,150,6.55,159.5,6.181458
14,44.2,6.151395,52,6.65,60,6.9,75,7.16,90,7.28,110,7.53,120,7.52,135,7.33,150,7.01,173.6,6.450198
16,44.1,6.238457,52,6.74,60,6.99,75,7.29,90,7.48,110,7.78,120,7.81,135,7.65,150,7.35,179,6.89105
20,44.2,6.304831,52,6.82,60,7.08,75,7.45,90,7.77,110,8.16,120,8.34,135,8.27,150,7.97,179,7.541149

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.62	5	5.28	5.23	5.12	4.98	4.49	3.79
8	5.54	5.89	6.15	6.16	6.21	6.08	5.57	4.88
10	6.16	6.45	6.67	6.73	6.86	6.79	6.44	5.81
12	6.5	6.75	6.96	7.05	7.24	7.2	6.97	6.55
14	6.65	6.9	7.16	7.28	7.53	7.52	7.33	7.01
16	6.74	6.99	7.29	7.48	7.78	7.81	7.65	7.35
20	6.82	7.08	7.45	7.77	8.16	8.34	8.27	7.97

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	47.4°	2.92	146.9°	3.28
8	45.6°	3.55	151.4°	4.23
10	45°	4	153.8°	5.05
12	44.7°	4.27	159.5°	5.79
14	44.2°	4.41	173.6°	6.41
16	44.1°	4.48	179°	6.89
20	44.2°	4.52	179°	7.54

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°	4.62	5.54	6.16	6.50	6.65	6.74	6.82
60°	5.00	5.89	6.45	6.75	6.90	6.99	7.08
75°	5.28	6.15	6.67	6.96	7.16	7.29	7.45
90°	5.23	6.16	6.73	7.05	7.28	7.48	7.77
110°	5.12	6.21	6.86	7.24	7.53	7.78	8.16
120°	4.98	6.08	6.79	7.20	7.52	7.81	8.34
135°	4.49	5.57	6.44	6.97	7.33	7.65	8.27
150°	3.79	4.88	5.81	6.55	7.01	7.35	7.97