EMBER SEA: ORC Rating

GPH

475

OSN

462.8

LOA

17.117 m

Displacement

10815 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.8489

Medium

1.1377

High

1.3186

Triple Offshore

Low

1.1071

Medium

1.4215

High

1.6196

Boat Specifications

Dimensions

Length overall: 17.117 m
Beam: 4.52 m
Draft: 2.98 m
Displacement: 10815 kg
Crew weight: 960 kg
Wetted surface: 46.04 m²

Sails

Mainsail: 101.33 m²
Genoa: 63.09 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 241.69 m²

Design

Type: BRENTA 55
Builder: HOLLAND COMPOSITES
Designer: LUCA BRENTA
Year built: 1998
Stability index: 141

Performance data

Polar CSV

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

6,43.8,6.290178,52,6.99,60,7.46,75,7.88,90,7.81,110,7.48,120,7.21,135,6.42,141.5,5.928893,150,5.36
8,42.3,7.490221,52,8.39,60,8.78,75,9.06,90,9.02,110,8.99,120,8.86,135,8.2,140.2,7.705489,150,6.83
10,40.6,8.020848,52,8.95,60,9.27,75,9.61,90,9.63,110,9.73,120,9.72,135,9.25,145.6,8.580638,150,8.18
12,40,8.30239,52,9.19,60,9.51,75,10.04,90,10.25,110,10.23,120,10.52,135,10.05,150,9.13,152.1,8.984282
14,39.3,8.438435,52,9.33,60,9.69,75,10.34,90,10.79,110,10.69,120,11.08,135,10.97,150,9.81,151.4,9.692671
16,38.2,8.5639,52,9.46,60,9.78,75,10.57,90,11.21,110,11.11,120,11.62,135,12.03,148.7,10.720236,150,10.58
20,38.1,8.730073,52,9.71,60,10.19,75,10.86,90,11.76,110,12.59,120,12.74,135,14.1,144.2,13.611753,150,12.75

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	6.99	7.46	7.88	7.81	7.48	7.21	6.42	5.36
8	8.39	8.78	9.06	9.02	8.99	8.86	8.2	6.83
10	8.95	9.27	9.61	9.63	9.73	9.72	9.25	8.18
12	9.19	9.51	10.04	10.25	10.23	10.52	10.05	9.13
14	9.33	9.69	10.34	10.79	10.69	11.08	10.97	9.81
16	9.46	9.78	10.57	11.21	11.11	11.62	12.03	10.58
20	9.71	10.19	10.86	11.76	12.59	12.74	14.1	12.75

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.8°	4.54	141.5°	4.64
8	42.3°	5.54	140.2°	5.92
10	40.6°	6.09	145.6°	7.08
12	40°	6.36	152.1°	7.94
14	39.3°	6.53	151.4°	8.51
16	38.2°	6.73	148.7°	9.16
20	38.1°	6.87	144.2°	11.04

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°	6.99	8.39	8.95	9.19	9.33	9.46	9.71
60°	7.46	8.78	9.27	9.51	9.69	9.78	10.19
75°	7.88	9.06	9.61	10.04	10.34	10.57	10.86
90°	7.81	9.02	9.63	10.25	10.79	11.21	11.76
110°	7.48	8.99	9.73	10.23	10.69	11.11	12.59
120°	7.21	8.86	9.72	10.52	11.08	11.62	12.74
135°	6.42	8.20	9.25	10.05	10.97	12.03	14.10
150°	5.36	6.83	8.18	9.13	9.81	10.58	12.75