CHESTRESS 3 — ORC Rating

GPH

578.2

OSN

561.7

LOA

12.19 m

Displacement

7332 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7935

Medium

1.0701

High

1.2167

Triple Offshore

Low

1.0232

Medium

1.3178

High

1.4655

Boat Specifications

Dimensions

Length overall: 12.19 m
Beam: 3.64 m
Draft: 2.38 m
Displacement: 7332 kg
Crew weight: 675 kg
Wetted surface: 33.1 m²

Sails

Mainsail: 50.36 m²
Genoa: 42.86 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 144.67 m²

Design

Type: J 122
Builder: J BOATS
Designer: JOHNSTONE A.
Year built: 2006

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.

6,42.4,5.010459,52,5.62,60,5.92,75,6.16,90,6.13,110,6.21,120,6.05,135,5.43,143.7,4.925997,150,4.58
8,41,5.975809,52,6.73,60,7.02,75,7.22,90,7.33,110,7.45,120,7.31,135,6.73,147.3,5.917928,150,5.75
10,40.1,6.693498,52,7.4,60,7.59,75,7.73,90,7.8,110,8.01,120,7.94,135,7.6,148.3,6.911052,150,6.79
12,38.5,6.951116,52,7.68,60,7.86,75,8.03,90,8.06,110,8.41,120,8.4,135,8.09,150,7.53,150.5,7.50268
14,37.5,7.046041,52,7.79,60,7.99,75,8.26,90,8.36,110,8.68,120,8.9,135,8.56,150,7.9,152.2,7.777694
16,37.4,7.124743,52,7.85,60,8.07,75,8.43,90,8.66,110,8.94,120,9.3,135,9.11,150,8.24,175.9,7.418987
20,36.7,7.258888,52,7.96,60,8.15,75,8.59,90,9.13,110,9.43,120,9.92,135,10.41,150,9.1,177.7,8.186595

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.62	5.92	6.16	6.13	6.21	6.05	5.43	4.58
8	6.73	7.02	7.22	7.33	7.45	7.31	6.73	5.75
10	7.4	7.59	7.73	7.8	8.01	7.94	7.6	6.79
12	7.68	7.86	8.03	8.06	8.41	8.4	8.09	7.53
14	7.79	7.99	8.26	8.36	8.68	8.9	8.56	7.9
16	7.85	8.07	8.43	8.66	8.94	9.3	9.11	8.24
20	7.96	8.15	8.59	9.13	9.43	9.92	10.41	9.1

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.4°	3.7	143.7°	3.97
8	41°	4.51	147.3°	4.98
10	40.1°	5.12	148.3°	5.88
12	38.5°	5.44	150.5°	6.53
14	37.5°	5.59	152.2°	6.88
16	37.4°	5.66	175.9°	7.4
20	36.7°	5.82	177.7°	8.18

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