'T SPANWIL IV: ORC Rating

GPH

583.6

OSN

565.5

LOA

13.667 m

Displacement

11306 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7695

Medium

1.0609

High

1.2467

Triple Offshore

Low

0.9947

Medium

1.3126

High

1.4844

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: 49.41 m²
Spinnaker: 141.21 m²
Asymmetric spinnaker: 0 m²

Design

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

Performance data

Polar CSV

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

6,42.7,4.925742,52,5.54,60,5.86,75,6.12,90,6.04,110,5.93,120,5.77,135,5.2,144,4.697058,150,4.38
8,41,5.843307,52,6.6,60,6.93,75,7.19,90,7.13,110,7.22,120,7.05,135,6.44,148.1,5.653899,150,5.54
10,40.5,6.601737,52,7.4,60,7.65,75,7.82,90,7.86,110,8,120,7.9,135,7.47,150,6.56,150.2,6.545548
12,39.9,7.078007,52,7.8,60,7.99,75,8.15,90,8.18,110,8.4,120,8.35,135,8.07,150,7.44,153.4,7.258256
14,38.7,7.201155,52,7.97,60,8.17,75,8.38,90,8.44,110,8.73,120,8.74,135,8.46,150,8.03,161.3,7.548482
16,38.2,7.278679,52,8.05,60,8.26,75,8.56,90,8.69,110,8.96,120,9.15,135,8.86,150,8.41,180,7.76
20,37.2,7.394575,52,8.13,60,8.34,75,8.75,90,9.14,110,9.36,120,9.75,135,9.78,150,9.18,180,8.54

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.54	5.86	6.12	6.04	5.93	5.77	5.2	4.38
8	6.6	6.93	7.19	7.13	7.22	7.05	6.44	5.54
10	7.4	7.65	7.82	7.86	8	7.9	7.47	6.56
12	7.8	7.99	8.15	8.18	8.4	8.35	8.07	7.44
14	7.97	8.17	8.38	8.44	8.73	8.74	8.46	8.03
16	8.05	8.26	8.56	8.69	8.96	9.15	8.86	8.41
20	8.13	8.34	8.75	9.14	9.36	9.75	9.78	9.18

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.7°	3.62	144°	3.8
8	41°	4.41	148.1°	4.8
10	40.5°	5.02	150.2°	5.68
12	39.9°	5.43	153.4°	6.49
14	38.7°	5.62	161.3°	7.15
16	38.2°	5.72	180°	7.76
20	37.2°	5.89	180°	8.54

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°	5.54	6.60	7.40	7.80	7.97	8.05	8.13
60°	5.86	6.93	7.65	7.99	8.17	8.26	8.34
75°	6.12	7.19	7.82	8.15	8.38	8.56	8.75
90°	6.04	7.13	7.86	8.18	8.44	8.69	9.14
110°	5.93	7.22	8.00	8.40	8.73	8.96	9.36
120°	5.77	7.05	7.90	8.35	8.74	9.15	9.75
135°	5.20	6.44	7.47	8.07	8.46	8.86	9.78
150°	4.38	5.54	6.56	7.44	8.03	8.41	9.18