IMPALA: ORC Rating

GPH

699.6

OSN

677.6

LOA

8.99 m

Displacement

3712 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5824

Medium

0.7932

High

0.9214

Triple Offshore

Low

0.749

Medium

0.9677

High

1.0873

Boat Specifications

Dimensions

Length overall: 8.99 m
Beam: 3.24 m
Draft: 1.74 m
Displacement: 3712 kg
Crew weight: 320 kg
Wetted surface: 19.79 m²

Sails

Mainsail: 26.57 m²
Genoa: 19.37 m²
Spinnaker: 51.75 m²
Asymmetric spinnaker: 51.17 m²

Design

Type: FORTUNA 9
Builder: MONOTIPO
Designer: J. VISIERS
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.

6,43.2,4.197712,52,4.64,60,4.88,75,5.04,90,5.16,110,5.14,120,4.95,135,4.45,145,3.991933,150,3.78
8,41,4.902548,52,5.47,60,5.69,75,5.85,90,6.06,110,6.08,120,5.93,135,5.47,147.3,4.919723,150,4.78
10,39.8,5.414668,52,6,60,6.17,75,6.3,90,6.53,110,6.57,120,6.48,135,6.19,150,5.58,154.7,5.375615
12,38.4,5.729281,52,6.3,60,6.44,75,6.57,90,6.83,110,6.91,120,6.84,135,6.61,150,6.2,162.8,5.788889
14,37.4,5.89113,52,6.48,60,6.62,75,6.78,90,7.06,110,7.23,120,7.17,135,6.94,150,6.59,176.3,6.10272
16,37,5.972687,52,6.59,60,6.75,75,6.96,90,7.21,110,7.52,120,7.5,135,7.26,150,6.9,179,6.490989
20,37.1,6.030713,52,6.67,60,6.87,75,7.2,90,7.4,110,8.1,120,8.21,135,7.95,150,7.51,179,7.09108
24,38.2,6.018908,52,6.67,60,6.89,75,7.3,90,7.65,110,8.48,120,9.09,135,8.89,150,8.24,179,7.671168

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.64	4.88	5.04	5.16	5.14	4.95	4.45	3.78
8	5.47	5.69	5.85	6.06	6.08	5.93	5.47	4.78
10	6	6.17	6.3	6.53	6.57	6.48	6.19	5.58
12	6.3	6.44	6.57	6.83	6.91	6.84	6.61	6.2
14	6.48	6.62	6.78	7.06	7.23	7.17	6.94	6.59
16	6.59	6.75	6.96	7.21	7.52	7.5	7.26	6.9
20	6.67	6.87	7.2	7.4	8.1	8.21	7.95	7.51
24	6.67	6.89	7.3	7.65	8.48	9.09	8.89	8.24

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.2°	3.06	145°	3.27
8	41°	3.7	147.3°	4.14
10	39.8°	4.16	154.7°	4.86
12	38.4°	4.49	162.8°	5.53
14	37.4°	4.68	176.3°	6.09
16	37°	4.77	179°	6.49
20	37.1°	4.81	179°	7.09
24	38.2°	4.73	179°	7.67

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 kt24 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)	Boat speed in 24 kt (kt)
0°	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
52°	4.64	5.47	6.00	6.30	6.48	6.59	6.67	6.67
60°	4.88	5.69	6.17	6.44	6.62	6.75	6.87	6.89
75°	5.04	5.85	6.30	6.57	6.78	6.96	7.20	7.30
90°	5.16	6.06	6.53	6.83	7.06	7.21	7.40	7.65
110°	5.14	6.08	6.57	6.91	7.23	7.52	8.10	8.48
120°	4.95	5.93	6.48	6.84	7.17	7.50	8.21	9.09
135°	4.45	5.47	6.19	6.61	6.94	7.26	7.95	8.89
150°	3.78	4.78	5.58	6.20	6.59	6.90	7.51	8.24