Bravo: ORC Rating

GPH

673.3

OSN

652.5

LOA

6.91 m

Displacement

811 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6775

Medium

0.9031

High

1.0586

Triple Offshore

Low

0.8727

Medium

1.1255

High

1.3216

Boat Specifications

Dimensions

Length overall: 6.91 m
Beam: 2.25 m
Draft: 1.38 m
Displacement: 811 kg
Crew weight: 340 kg
Wetted surface: 10.92 m²

Sails

Mainsail: 16 m²
Genoa: 10.01 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 45.64 m²

Design

Type: J-70 ONE DESIGN
Designer: JOHNSTONE
Year built: 2012

Performance data

Polar CSV

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

6,42.7,4.122928,52,4.61,60,4.88,75,5.15,90,5.46,110,5.53,120,5.36,135,4.81,145.3,4.305815,150,4.09
8,41.8,4.963272,52,5.54,60,5.74,75,5.95,90,6.22,110,6.32,120,6.21,135,5.85,147.8,5.270664,150,5.15
10,39.7,5.458802,52,6,60,6.17,75,6.34,90,6.76,110,7.05,120,6.89,135,6.46,150,5.9,150.1,5.894589
12,37.6,5.717606,52,6.31,60,6.53,75,6.78,90,7.06,110,7.82,120,7.77,135,7.14,148.6,6.467102,150,6.37
14,36.8,5.794702,52,6.51,60,6.85,75,7.28,90,7.43,110,8.36,120,8.77,135,8.01,145.4,7.289193,150,6.93
16,36.8,5.81968,52,6.59,60,6.98,75,7.67,90,8.01,110,8.75,120,9.46,135,9.03,143.5,8.297497,150,7.7
20,38.1,5.883586,52,6.64,60,7.03,75,7.92,90,9.02,110,9.88,120,10.82,135,12.62,137.2,12.443272,150,10.55

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.61	4.88	5.15	5.46	5.53	5.36	4.81	4.09
8	5.54	5.74	5.95	6.22	6.32	6.21	5.85	5.15
10	6	6.17	6.34	6.76	7.05	6.89	6.46	5.9
12	6.31	6.53	6.78	7.06	7.82	7.77	7.14	6.37
14	6.51	6.85	7.28	7.43	8.36	8.77	8.01	6.93
16	6.59	6.98	7.67	8.01	8.75	9.46	9.03	7.7
20	6.64	7.03	7.92	9.02	9.88	10.82	12.62	10.55

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.7°	3.03	145.3°	3.54
8	41.8°	3.7	147.8°	4.46
10	39.7°	4.2	150.1°	5.11
12	37.6°	4.53	148.6°	5.52
14	36.8°	4.64	145.4°	6
16	36.8°	4.66	143.5°	6.67
20	38.1°	4.63	137.2°	9.13

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°	4.61	5.54	6.00	6.31	6.51	6.59	6.64
60°	4.88	5.74	6.17	6.53	6.85	6.98	7.03
75°	5.15	5.95	6.34	6.78	7.28	7.67	7.92
90°	5.46	6.22	6.76	7.06	7.43	8.01	9.02
110°	5.53	6.32	7.05	7.82	8.36	8.75	9.88
120°	5.36	6.21	6.89	7.77	8.77	9.46	10.82
135°	4.81	5.85	6.46	7.14	8.01	9.03	12.62
150°	4.09	5.15	5.90	6.37	6.93	7.70	10.55