TWISTED: ORC Rating

GPH

754.1

OSN

733.2

LOA

8.456 m

Displacement

2920 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6072

Medium

0.8148

High

0.9339

Triple Offshore

Low

0.7798

Medium

1.0119

High

1.1263

Boat Specifications

Dimensions

Length overall: 8.456 m
Beam: 2.79 m
Draft: 1.56 m
Displacement: 2920 kg
Crew weight: 433 kg
Wetted surface: 16.52 m²

Sails

Mainsail: 14 m²
Genoa: 25.96 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 53.1 m²

Design

Type: SPIRIT 28
Builder: HEYGEN
Designer: VAN DER STADT
Year built: 1971

Performance data

Polar CSV

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

6,42.6,3.817431,52,4.26,60,4.48,75,4.65,90,4.62,110,4.73,120,4.56,135,4.15,146.1,3.722836,150,3.57
8,41.3,4.485773,52,5.03,60,5.28,75,5.49,90,5.61,110,5.72,120,5.58,135,5.11,146.5,4.616939,150,4.45
10,41.4,5.065916,52,5.64,60,5.84,75,5.98,90,6.16,110,6.22,120,6.15,135,5.89,145.7,5.483609,150,5.23
12,40.6,5.439426,52,5.96,60,6.11,75,6.23,90,6.42,110,6.53,120,6.47,135,6.28,147.8,5.885181,150,5.75
14,40.1,5.582273,52,6.1,60,6.26,75,6.42,90,6.58,110,6.84,120,6.78,135,6.56,150,6.08,171.3,5.472973
16,39.5,5.598577,52,6.16,60,6.34,75,6.57,90,6.67,110,7.13,120,7.12,135,6.87,150,6.31,173.9,5.903426
20,40.3,5.611876,52,6.17,60,6.37,75,6.73,90,7.01,110,7.46,120,7.7,135,7.5,150,6.78,176,6.415628

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.26	4.48	4.65	4.62	4.73	4.56	4.15	3.57
8	5.03	5.28	5.49	5.61	5.72	5.58	5.11	4.45
10	5.64	5.84	5.98	6.16	6.22	6.15	5.89	5.23
12	5.96	6.11	6.23	6.42	6.53	6.47	6.28	5.75
14	6.1	6.26	6.42	6.58	6.84	6.78	6.56	6.08
16	6.16	6.34	6.57	6.67	7.13	7.12	6.87	6.31
20	6.17	6.37	6.73	7.01	7.46	7.7	7.5	6.78

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.6°	2.81	146.1°	3.09
8	41.3°	3.37	146.5°	3.85
10	41.4°	3.8	145.7°	4.53
12	40.6°	4.13	147.8°	4.98
14	40.1°	4.27	171.3°	5.41
16	39.5°	4.32	173.9°	5.87
20	40.3°	4.28	176°	6.4

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°	4.26	5.03	5.64	5.96	6.10	6.16	6.17
60°	4.48	5.28	5.84	6.11	6.26	6.34	6.37
75°	4.65	5.49	5.98	6.23	6.42	6.57	6.73
90°	4.62	5.61	6.16	6.42	6.58	6.67	7.01
110°	4.73	5.72	6.22	6.53	6.84	7.13	7.46
120°	4.56	5.58	6.15	6.47	6.78	7.12	7.70
135°	4.15	5.11	5.89	6.28	6.56	6.87	7.50
150°	3.57	4.45	5.23	5.75	6.08	6.31	6.78