SFERIKA: ORC Rating

GPH

678.8

OSN

655.7

LOA

9.61 m

Displacement

3921 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5907

Medium

0.8147

High

0.941

Triple Offshore

Low

0.7614

Medium

1.004

High

1.128

Boat Specifications

Dimensions

Length overall: 9.61 m
Beam: 3.21 m
Draft: 1.94 m
Displacement: 3921 kg
Crew weight: 460 kg
Wetted surface: 22.06 m²

Sails

Mainsail: 25.27 m²
Genoa: 25.66 m²
Spinnaker: 61.04 m²
Asymmetric spinnaker: 0 m²

Design

Type: First 31.7
Builder: Beneteau
Designer: Finot
Year built: 1998
Stability index: 107.8

Performance data

Polar CSV

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

6,43.8,4.322765,52,4.78,60,5.04,75,5.21,90,5.09,110,5.15,120,4.97,135,4.45,145.7,3.946262,150,3.76
8,41.4,5.079248,52,5.68,60,5.94,75,6.12,90,6.12,110,6.24,120,6.09,135,5.56,149.8,4.859565,150,4.84
10,40.2,5.629775,52,6.28,60,6.49,75,6.66,90,6.75,110,6.89,120,6.8,135,6.41,150,5.76,153.2,5.601702
12,39.3,5.957302,52,6.62,60,6.8,75,6.98,90,7.07,110,7.29,120,7.24,135,6.95,150,6.48,157.7,6.160765
14,38.8,6.082085,52,6.78,60,6.98,75,7.2,90,7.28,110,7.64,120,7.62,135,7.35,150,6.97,170,6.397188
16,38.8,6.146242,52,6.84,60,7.06,75,7.37,90,7.52,110,7.93,120,7.99,135,7.75,150,7.34,177.2,6.808128
20,39.4,6.172891,52,6.87,60,7.12,75,7.53,90,7.89,110,8.28,120,8.66,135,8.6,150,8.1,179,7.521146

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.78	5.04	5.21	5.09	5.15	4.97	4.45	3.76
8	5.68	5.94	6.12	6.12	6.24	6.09	5.56	4.84
10	6.28	6.49	6.66	6.75	6.89	6.8	6.41	5.76
12	6.62	6.8	6.98	7.07	7.29	7.24	6.95	6.48
14	6.78	6.98	7.2	7.28	7.64	7.62	7.35	6.97
16	6.84	7.06	7.37	7.52	7.93	7.99	7.75	7.34
20	6.87	7.12	7.53	7.89	8.28	8.66	8.6	8.1

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.8°	3.12	145.7°	3.26
8	41.4°	3.81	149.8°	4.2
10	40.2°	4.3	153.2°	5
12	39.3°	4.61	157.7°	5.7
14	38.8°	4.74	170°	6.3
16	38.8°	4.79	177.2°	6.8
20	39.4°	4.77	179°	7.52

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°	4.78	5.68	6.28	6.62	6.78	6.84	6.87
60°	5.04	5.94	6.49	6.80	6.98	7.06	7.12
75°	5.21	6.12	6.66	6.98	7.20	7.37	7.53
90°	5.09	6.12	6.75	7.07	7.28	7.52	7.89
110°	5.15	6.24	6.89	7.29	7.64	7.93	8.28
120°	4.97	6.09	6.80	7.24	7.62	7.99	8.66
135°	4.45	5.56	6.41	6.95	7.35	7.75	8.60
150°	3.76	4.84	5.76	6.48	6.97	7.34	8.10