'T SPANWIL IV — ORC Rating

GPH

572.6

OSN

556.7

LOA

13.667 m

Displacement

11306 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7956

Medium

1.0771

High

1.2528

Triple Offshore

Low

1.0283

Medium

1.3316

High

1.4913

Boat Specifications

Dimensions

Length overall: 13.667 m
Beam: 4.16 m
Draft: 2.49 m
Displacement: 11306 kg
Crew weight: 750 kg
Wetted surface: 42.38 m²

Sails

Mainsail: 58.87 m²
Genoa: 74.56 m²
Spinnaker: 141.21 m²
Asymmetric spinnaker: 0 m²

Design

Type: J-44 (Mod.)
Builder: J-Boats
Designer: Johnstone
Year built: 1989

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.

6,42.8,5.301679,52,5.91,60,6.23,75,6.48,90,6.4,110,5.9,120,5.74,135,5.19,144.1,4.678772,150,4.38
8,41.4,6.252407,52,7.02,60,7.33,75,7.53,90,7.49,110,7.22,120,7.03,135,6.42,148.4,5.635609,150,5.54
10,41.2,6.950952,52,7.66,60,7.87,75,8.02,90,8.04,110,8,120,7.9,135,7.45,150,6.56,150.4,6.532528
12,39.6,7.177034,52,7.9,60,8.1,75,8.29,90,8.35,110,8.41,120,8.35,135,8.06,150,7.44,153.5,7.251928
14,38.6,7.280679,52,8.02,60,8.22,75,8.48,90,8.6,110,8.74,120,8.74,135,8.46,150,8.03,161.3,7.548482
16,38,7.347615,52,8.08,60,8.29,75,8.6,90,8.84,110,8.99,120,9.15,135,8.86,150,8.41,180,7.77
20,37.1,7.409878,52,8.13,60,8.36,75,8.74,90,9.2,110,9.39,120,9.78,135,9.78,150,9.18,180,8.54

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.91	6.23	6.48	6.4	5.9	5.74	5.19	4.38
8	7.02	7.33	7.53	7.49	7.22	7.03	6.42	5.54
10	7.66	7.87	8.02	8.04	8	7.9	7.45	6.56
12	7.9	8.1	8.29	8.35	8.41	8.35	8.06	7.44
14	8.02	8.22	8.48	8.6	8.74	8.74	8.46	8.03
16	8.08	8.29	8.6	8.84	8.99	9.15	8.86	8.41
20	8.13	8.36	8.74	9.2	9.39	9.78	9.78	9.18

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.8°	3.89	144.1°	3.79
8	41.4°	4.69	148.4°	4.8
10	41.2°	5.23	150.4°	5.68
12	39.6°	5.53	153.5°	6.49
14	38.6°	5.69	161.3°	7.15
16	38°	5.79	180°	7.77
20	37.1°	5.91	180°	8.54

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