Fanny: ORC Rating

GPH

696.9

OSN

678.5

LOA

9.447 m

Displacement

4315 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5909

Medium

0.7902

High

0.8979

Triple Offshore

Low

0.761

Medium

0.9686

High

1.0689

Boat Specifications

Dimensions

Length overall: 9.447 m
Beam: 3.02 m
Draft: 1.63 m
Displacement: 4315 kg
Crew weight: 350 kg
Wetted surface: 20.06 m²

Sails

Mainsail: 31.3 m²
Genoa: 21.86 m²
Spinnaker: 59.95 m²
Asymmetric spinnaker: 0 m²

Design

Type: Inferno 31
Builder: Finngulf Marine
Designer: Håkan Södergren
Year built: 1984
Stability index: 124.3

Performance data

Polar CSV

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

6,43.2,4.21143,52,4.7,60,4.96,75,5.17,90,5.2,110,5.24,120,5.08,135,4.6,146.6,4.06062,150,3.92
8,41.8,4.909615,52,5.5,60,5.79,75,6,90,6.15,110,6.22,120,6.09,135,5.58,150,4.9,152.3,4.800125
10,41.8,5.473013,52,6.07,60,6.27,75,6.42,90,6.58,110,6.66,120,6.59,135,6.32,150,5.77,153.8,5.583676
12,41.5,5.794735,52,6.32,60,6.49,75,6.65,90,6.77,110,6.97,120,6.91,135,6.7,150,6.38,161.9,5.996745
14,41.1,5.892006,52,6.43,60,6.62,75,6.82,90,6.91,110,7.28,120,7.24,135,7.01,150,6.72,176.6,6.271038
16,40.8,5.918136,52,6.47,60,6.67,75,6.95,90,7.11,110,7.49,120,7.58,135,7.37,150,7.02,179,6.63101
20,40.8,5.970977,52,6.51,60,6.69,75,7.07,90,7.45,110,7.76,120,8.05,135,8.08,150,7.71,179,7.231101

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.7	4.96	5.17	5.2	5.24	5.08	4.6	3.92
8	5.5	5.79	6	6.15	6.22	6.09	5.58	4.9
10	6.07	6.27	6.42	6.58	6.66	6.59	6.32	5.77
12	6.32	6.49	6.65	6.77	6.97	6.91	6.7	6.38
14	6.43	6.62	6.82	6.91	7.28	7.24	7.01	6.72
16	6.47	6.67	6.95	7.11	7.49	7.58	7.37	7.02
20	6.51	6.69	7.07	7.45	7.76	8.05	8.08	7.71

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.2°	3.07	146.6°	3.39
8	41.8°	3.66	152.3°	4.25
10	41.8°	4.08	153.8°	5.01
12	41.5°	4.34	161.9°	5.7
14	41.1°	4.44	176.6°	6.26
16	40.8°	4.48	179°	6.63
20	40.8°	4.52	179°	7.23

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°	4.70	5.50	6.07	6.32	6.43	6.47	6.51
60°	4.96	5.79	6.27	6.49	6.62	6.67	6.69
75°	5.17	6.00	6.42	6.65	6.82	6.95	7.07
90°	5.20	6.15	6.58	6.77	6.91	7.11	7.45
110°	5.24	6.22	6.66	6.97	7.28	7.49	7.76
120°	5.08	6.09	6.59	6.91	7.24	7.58	8.05
135°	4.60	5.58	6.32	6.70	7.01	7.37	8.08
150°	3.92	4.90	5.77	6.38	6.72	7.02	7.71