ERA ORA: ORC Rating

GPH

741.2

OSN

718.6

LOA

8.61 m

Displacement

2994 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6139

Medium

0.8383

High

0.9749

Triple Offshore

Low

0.7894

Medium

1.0301

High

1.1603

Boat Specifications

Dimensions

Length overall: 8.61 m
Beam: 2.99 m
Draft: 1.68 m
Displacement: 2994 kg
Crew weight: 424 kg
Wetted surface: 17.31 m²

Sails

Mainsail: 15.49 m²
Genoa: 26.25 m²
Spinnaker: 55.12 m²
Asymmetric spinnaker: 0 m²

Design

Type: FIRST 28 DK
Builder: BENETEAU SA
Designer: FINOT Jean Marie
Year built: 1981

Performance data

Polar CSV

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

6,43.5,3.887648,52,4.33,60,4.57,75,4.76,90,4.7,110,4.76,120,4.62,135,4.23,147.9,3.706668,150,3.63
8,42.3,4.569846,52,5.12,60,5.41,75,5.61,90,5.62,110,5.76,120,5.64,135,5.18,150,4.56,151.6,4.49043
10,41.9,5.105389,52,5.69,60,5.9,75,6.06,90,6.17,110,6.27,120,6.22,135,5.96,150,5.38,151.7,5.303941
12,40.7,5.473964,52,6,60,6.16,75,6.3,90,6.46,110,6.6,120,6.55,135,6.35,150,6.02,160.7,5.647377
14,39.6,5.645588,52,6.18,60,6.33,75,6.49,90,6.61,110,6.92,120,6.89,135,6.66,150,6.36,180,5.9
16,39.4,5.719953,52,6.26,60,6.44,75,6.67,90,6.75,110,7.2,120,7.22,135,7,150,6.65,180,6.27
20,40.1,5.739152,52,6.28,60,6.5,75,6.9,90,7.14,110,7.51,120,7.76,135,7.66,150,7.27,180,6.83

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.33	4.57	4.76	4.7	4.76	4.62	4.23	3.63
8	5.12	5.41	5.61	5.62	5.76	5.64	5.18	4.56
10	5.69	5.9	6.06	6.17	6.27	6.22	5.96	5.38
12	6	6.16	6.3	6.46	6.6	6.55	6.35	6.02
14	6.18	6.33	6.49	6.61	6.92	6.89	6.66	6.36
16	6.26	6.44	6.67	6.75	7.2	7.22	7	6.65
20	6.28	6.5	6.9	7.14	7.51	7.76	7.66	7.27

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.5°	2.82	147.9°	3.14
8	42.3°	3.38	151.6°	3.95
10	41.9°	3.8	151.7°	4.67
12	40.7°	4.15	160.7°	5.33
14	39.6°	4.35	180°	5.9
16	39.4°	4.42	180°	6.27
20	40.1°	4.39	180°	6.83

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°	4.33	5.12	5.69	6.00	6.18	6.26	6.28
60°	4.57	5.41	5.90	6.16	6.33	6.44	6.50
75°	4.76	5.61	6.06	6.30	6.49	6.67	6.90
90°	4.70	5.62	6.17	6.46	6.61	6.75	7.14
110°	4.76	5.76	6.27	6.60	6.92	7.20	7.51
120°	4.62	5.64	6.22	6.55	6.89	7.22	7.76
135°	4.23	5.18	5.96	6.35	6.66	7.00	7.66
150°	3.63	4.56	5.38	6.02	6.36	6.65	7.27