Pure Magic: ORC Rating

GPH

665.6

OSN

647.5

LOA

8.428 m

Displacement

1730 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6243

Medium

0.8292

High

0.9391

Triple Offshore

Low

0.8031

Medium

1.0094

High

1.1257

Boat Specifications

Dimensions

Length overall: 8.428 m
Beam: 2.6 m
Draft: 1.51 m
Displacement: 1730 kg
Crew weight: 375 kg
Wetted surface: 15.01 m²

Sails

Mainsail: 24.33 m²
Genoa: 22.84 m²
Spinnaker: 43.35 m²
Asymmetric spinnaker: 37.14 m²

Design

Type: J-27
Builder: J boats
Designer: Johnstone
Year built: 1983
Stability index: 99

Performance data

Polar CSV

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

6,42.4,4.739623,52,5.28,60,5.52,75,5.67,90,5.57,110,5.33,120,5.12,135,4.59,144.2,4.031742,150,3.78
8,40,5.482711,52,6.06,60,6.21,75,6.31,90,6.35,110,6.24,120,6.11,135,5.62,150,4.84,150.2,4.840018
10,37.6,5.742849,52,6.37,60,6.51,75,6.65,90,6.77,110,6.76,120,6.67,135,6.33,150,5.74,153.2,5.590499
12,37.2,5.88804,52,6.49,60,6.66,75,6.89,90,7.09,110,7.19,120,7.15,135,6.8,150,6.38,161.9,5.986224
14,37,5.960166,52,6.57,60,6.75,75,7.04,90,7.3,110,7.58,120,7.61,135,7.27,150,6.82,177.2,6.267483
16,36.9,6.002366,52,6.62,60,6.82,75,7.15,90,7.47,110,8,120,8.1,135,7.79,150,7.26,178.1,6.683675
20,37.5,6.037663,52,6.67,60,6.9,75,7.29,90,7.75,110,8.86,120,9.57,135,9.35,150,8.31,178.4,7.502925

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.28	5.52	5.67	5.57	5.33	5.12	4.59	3.78
8	6.06	6.21	6.31	6.35	6.24	6.11	5.62	4.84
10	6.37	6.51	6.65	6.77	6.76	6.67	6.33	5.74
12	6.49	6.66	6.89	7.09	7.19	7.15	6.8	6.38
14	6.57	6.75	7.04	7.3	7.58	7.61	7.27	6.82
16	6.62	6.82	7.15	7.47	8	8.1	7.79	7.26
20	6.67	6.9	7.29	7.75	8.86	9.57	9.35	8.31

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.4°	3.5	144.2°	3.27
8	40°	4.2	150.2°	4.2
10	37.6°	4.55	153.2°	4.99
12	37.2°	4.69	161.9°	5.69
14	37°	4.76	177.2°	6.26
16	36.9°	4.8	178.1°	6.68
20	37.5°	4.79	178.4°	7.5

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°	5.28	6.06	6.37	6.49	6.57	6.62	6.67
60°	5.52	6.21	6.51	6.66	6.75	6.82	6.90
75°	5.67	6.31	6.65	6.89	7.04	7.15	7.29
90°	5.57	6.35	6.77	7.09	7.30	7.47	7.75
110°	5.33	6.24	6.76	7.19	7.58	8.00	8.86
120°	5.12	6.11	6.67	7.15	7.61	8.10	9.57
135°	4.59	5.62	6.33	6.80	7.27	7.79	9.35
150°	3.78	4.84	5.74	6.38	6.82	7.26	8.31