J-70 — ORC Rating | RegattaPages

GPH

666.2

OSN

643.9

LOA

6.942 m

Displacement

792 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6142

Medium

0.8174

High

0.9534

Triple Offshore

Low

0.786

Medium

1.0116

High

1.1779

Boat Specifications

Dimensions

Length overall: 6.942 m
Beam: 2.26 m
Draft: 1.45 m
Displacement: 792 kg
Crew weight: 340 kg
Wetted surface: 10.71 m²

Sails

Mainsail: 16.2 m²
Genoa: 9.96 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 44.62 m²

Design

Type: J-70 ONE DESIGN
Builder: J BOATS
Designer: JOHNSTONE
Year built: 2012
Stability index: 97.6

Velocity Prediction

Polar CSV

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

6,43,4.279735,52,4.76,60,5,75,5.15,90,5.41,110,5.48,120,5.34,135,4.82,144.2,4.364638,150,4.09
8,41.2,5.103567,52,5.66,60,5.84,75,5.94,90,6.24,110,6.36,120,6.25,135,5.88,147.8,5.294299,150,5.18
10,38.8,5.555998,52,6.12,60,6.27,75,6.42,90,6.67,110,7.07,120,6.98,135,6.57,150,5.96,150.1,5.952266
12,36.9,5.752267,52,6.41,60,6.63,75,6.86,90,6.95,110,7.68,120,7.81,135,7.27,148.2,6.636132,150,6.51
14,36.6,5.817013,52,6.54,60,6.83,75,7.25,90,7.4,110,8.13,120,8.64,135,8.17,145.7,7.43253,150,7.09
16,36.6,5.841926,52,6.62,60,6.94,75,7.5,90,7.96,110,8.59,120,9.3,135,9.28,143.4,8.519994,150,7.89
20,37.9,5.880235,52,6.66,60,7.03,75,7.78,90,8.69,110,9.49,120,10.64,135,12.44,140.7,12.173056,150,10.87

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.76	5	5.15	5.41	5.48	5.34	4.82	4.09
8	5.66	5.84	5.94	6.24	6.36	6.25	5.88	5.18
10	6.12	6.27	6.42	6.67	7.07	6.98	6.57	5.96
12	6.41	6.63	6.86	6.95	7.68	7.81	7.27	6.51
14	6.54	6.83	7.25	7.4	8.13	8.64	8.17	7.09
16	6.62	6.94	7.5	7.96	8.59	9.3	9.28	7.89
20	6.66	7.03	7.78	8.69	9.49	10.64	12.44	10.87

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43°	3.13	144.2°	3.54
8	41.2°	3.84	147.8°	4.48
10	38.8°	4.33	150.1°	5.16
12	36.9°	4.6	148.2°	5.64
14	36.6°	4.67	145.7°	6.14
16	36.6°	4.69	143.4°	6.84
20	37.9°	4.64	140.7°	9.42

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