BLACKHAWK: ORC Rating

GPH

604.8

OSN

587.7

LOA

10.82 m

Displacement

4300 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6946

Medium

0.9187

High

1.0444

Triple Offshore

Low

0.887

Medium

1.1098

High

1.2289

Boat Specifications

Dimensions

Length overall: 10.82 m
Beam: 3.65 m
Draft: 2.1 m
Displacement: 4300 kg
Crew weight: 689 kg
Wetted surface: 24.6 m²

Sails

Mainsail: 33.06 m²
Genoa: 52.56 m²
Spinnaker: 95.77 m²
Asymmetric spinnaker: 0 m²

Design

Type: J 35
Builder: TPI
Designer: JOHNSTONE
Year built: 1983
Stability index: 111.5

Performance data

Polar CSV

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

6,42.1,5.283191,52,5.89,60,6.15,75,6.29,90,6.15,110,5.67,120,5.53,135,5,144.2,4.487933,150,4.2
8,39.6,6.073874,52,6.7,60,6.85,75,6.94,90,6.89,110,6.76,120,6.64,135,6.18,148.7,5.406931,150,5.34
10,37.2,6.402773,52,7.05,60,7.18,75,7.29,90,7.29,110,7.31,120,7.25,135,6.94,150,6.3,152,6.195158
12,36,6.526439,52,7.21,60,7.36,75,7.54,90,7.6,110,7.7,120,7.7,135,7.42,150,6.98,158.6,6.626885
14,35.4,6.61246,52,7.3,60,7.47,75,7.71,90,7.86,110,8.03,120,8.1,135,7.86,150,7.42,170.9,6.825912
16,35.1,6.673595,52,7.37,60,7.55,75,7.83,90,8.07,110,8.3,120,8.48,135,8.3,150,7.83,177.2,7.208606
20,35.1,6.746931,52,7.45,60,7.64,75,7.99,90,8.36,110,8.72,120,9.24,135,9.39,150,8.7,178.4,7.973109

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.89	6.15	6.29	6.15	5.67	5.53	5	4.2
8	6.7	6.85	6.94	6.89	6.76	6.64	6.18	5.34
10	7.05	7.18	7.29	7.29	7.31	7.25	6.94	6.3
12	7.21	7.36	7.54	7.6	7.7	7.7	7.42	6.98
14	7.3	7.47	7.71	7.86	8.03	8.1	7.86	7.42
16	7.37	7.55	7.83	8.07	8.3	8.48	8.3	7.83
20	7.45	7.64	7.99	8.36	8.72	9.24	9.39	8.7

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.1°	3.92	144.2°	3.64
8	39.6°	4.68	148.7°	4.62
10	37.2°	5.1	152°	5.47
12	36°	5.28	158.6°	6.17
14	35.4°	5.39	170.9°	6.74
16	35.1°	5.46	177.2°	7.2
20	35.1°	5.52	178.4°	7.97

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°	5.89	6.70	7.05	7.21	7.30	7.37	7.45
60°	6.15	6.85	7.18	7.36	7.47	7.55	7.64
75°	6.29	6.94	7.29	7.54	7.71	7.83	7.99
90°	6.15	6.89	7.29	7.60	7.86	8.07	8.36
110°	5.67	6.76	7.31	7.70	8.03	8.30	8.72
120°	5.53	6.64	7.25	7.70	8.10	8.48	9.24
135°	5.00	6.18	6.94	7.42	7.86	8.30	9.39
150°	4.20	5.34	6.30	6.98	7.42	7.83	8.70