JACKKNIFE — ORC Rating

GPH

537.9

OSN

523

LOA

12.527 m

Displacement

4533 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.747

Medium

1.0144

High

1.1722

Triple Offshore

Low

0.9745

Medium

1.2576

High

1.4299

Boat Specifications

Dimensions

Length overall: 12.527 m
Beam: 3.21 m
Draft: 2.49 m
Displacement: 4533 kg
Crew weight: 680 kg
Wetted surface: 28.22 m²

Sails

Mainsail: 46.17 m²
Genoa: 33.57 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 144.57 m²

Design

Type: J-125
Builder: TPI
Designer: JOHNSTONE
Year built: 1998
Stability index: 130.2

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.

6,43,5.400943,52,6.15,60,6.63,75,7.05,90,7.04,110,6.51,120,6.36,135,5.64,142.4,5.174875,150,4.74
8,41.2,6.485783,52,7.28,60,7.64,75,7.96,90,8,110,7.81,120,7.75,135,7.22,145.1,6.401253,150,6.07
10,38.8,6.993115,52,7.81,60,8.04,75,8.38,90,8.57,110,8.48,120,8.53,135,8.19,146.9,7.49655,150,7.25
12,37.8,7.201119,52,8.04,60,8.31,75,8.65,90,9.02,110,8.95,120,9.2,135,8.98,150,8.15,151.4,8.052548
14,37.6,7.345798,52,8.18,60,8.47,75,8.92,90,9.36,110,9.55,120,9.74,135,9.82,148.9,8.934128,150,8.84
16,37.2,7.407129,52,8.27,60,8.59,75,9.11,90,9.63,110,10.17,120,10.25,135,10.77,146.9,9.931735,150,9.61
20,37.5,7.512416,52,8.37,60,8.73,75,9.38,90,10.12,110,11.34,120,11.34,135,12.73,145.1,12.326985,150,11.67

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	6.15	6.63	7.05	7.04	6.51	6.36	5.64	4.74
8	7.28	7.64	7.96	8	7.81	7.75	7.22	6.07
10	7.81	8.04	8.38	8.57	8.48	8.53	8.19	7.25
12	8.04	8.31	8.65	9.02	8.95	9.2	8.98	8.15
14	8.18	8.47	8.92	9.36	9.55	9.74	9.82	8.84
16	8.27	8.59	9.11	9.63	10.17	10.25	10.77	9.61
20	8.37	8.73	9.38	10.12	11.34	11.34	12.73	11.67

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43°	3.95	142.4°	4.1
8	41.2°	4.88	145.1°	5.25
10	38.8°	5.45	146.9°	6.28
12	37.8°	5.69	151.4°	7.07
14	37.6°	5.82	148.9°	7.65
16	37.2°	5.9	146.9°	8.32
20	37.5°	5.96	145.1°	10.11

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