MAYHEM: ORC Rating

GPH

612.9

OSN

594.4

LOA

10.57 m

Displacement

3889 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6625

Medium

0.8956

High

1.0134

Triple Offshore

Low

0.8563

Medium

1.1051

High

1.2386

Boat Specifications

Dimensions

Length overall: 10.57 m
Beam: 3.35 m
Draft: 2 m
Displacement: 3889 kg
Crew weight: 458 kg
Wetted surface: 24.08 m²

Sails

Mainsail: 34.35 m²
Genoa: 25.39 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 88.86 m²

Design

Type: J 105
Builder: TPI
Designer: Johnstone
Year built: 1991
Stability index: 114.2

Performance data

Polar CSV

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

6,43,4.71728,52,5.25,60,5.53,75,5.88,90,6.09,110,5.87,120,5.64,135,5.07,143.4,4.621225,150,4.29
8,40.8,5.614304,52,6.27,60,6.5,75,6.84,90,7.03,110,6.93,120,6.81,135,6.31,147.5,5.608309,150,5.46
10,39,6.189314,52,6.87,60,7.04,75,7.27,90,7.51,110,7.53,120,7.47,135,7.14,149.2,6.484587,150,6.43
12,37.6,6.43704,52,7.15,60,7.33,75,7.5,90,7.85,110,8,120,8,135,7.69,150,7.09,150.1,7.082735
14,37,6.548669,52,7.28,60,7.5,75,7.76,90,8.08,110,8.41,120,8.51,135,8.25,149.8,7.520756,150,7.51
16,37,6.64884,52,7.37,60,7.6,75,7.96,90,8.25,110,8.84,120,9.03,135,8.83,150,7.9,173.9,6.999632
20,37,6.723968,52,7.46,60,7.71,75,8.17,90,8.62,110,9.62,120,10.18,135,10.46,142.6,9.780787,150,8.97

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.25	5.53	5.88	6.09	5.87	5.64	5.07	4.29
8	6.27	6.5	6.84	7.03	6.93	6.81	6.31	5.46
10	6.87	7.04	7.27	7.51	7.53	7.47	7.14	6.43
12	7.15	7.33	7.5	7.85	8	8	7.69	7.09
14	7.28	7.5	7.76	8.08	8.41	8.51	8.25	7.51
16	7.37	7.6	7.96	8.25	8.84	9.03	8.83	7.9
20	7.46	7.71	8.17	8.62	9.62	10.18	10.46	8.97

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43°	3.45	143.4°	3.71
8	40.8°	4.25	147.5°	4.73
10	39°	4.81	149.2°	5.57
12	37.6°	5.1	150.1°	6.14
14	37°	5.23	149.8°	6.5
16	37°	5.31	173.9°	6.96
20	37°	5.37	142.6°	7.77

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°	5.25	6.27	6.87	7.15	7.28	7.37	7.46
60°	5.53	6.50	7.04	7.33	7.50	7.60	7.71
75°	5.88	6.84	7.27	7.50	7.76	7.96	8.17
90°	6.09	7.03	7.51	7.85	8.08	8.25	8.62
110°	5.87	6.93	7.53	8.00	8.41	8.84	9.62
120°	5.64	6.81	7.47	8.00	8.51	9.03	10.18
135°	5.07	6.31	7.14	7.69	8.25	8.83	10.46
150°	4.29	5.46	6.43	7.09	7.51	7.90	8.97