JOY IV: ORC Rating

GPH

669

OSN

648.9

LOA

9.85 m

Displacement

3858 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6033

Medium

0.8241

High

0.9421

Triple Offshore

Low

0.7794

Medium

1.0157

High

1.1309

Boat Specifications

Dimensions

Length overall: 9.85 m
Beam: 3.21 m
Draft: 1.94 m
Displacement: 3858 kg
Crew weight: 350 kg
Wetted surface: 21.57 m²

Sails

Mainsail: 26.41 m²
Genoa: 29.95 m²
Spinnaker: 60.13 m²
Asymmetric spinnaker: 0 m²

Design

Type: FIRST 31.7 LR
Builder: Beneteau
Designer: Finot
Year built: 1998
Stability index: 109.6

Performance data

Polar CSV

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

6,43,4.402794,52,4.92,60,5.2,75,5.43,90,5.37,110,5.2,120,5.03,135,4.52,146,3.992581,150,3.82
8,41.4,5.212561,52,5.85,60,6.13,75,6.33,90,6.31,110,6.32,120,6.16,135,5.61,150,4.88,150.2,4.874589
10,40.6,5.808201,52,6.45,60,6.65,75,6.8,90,6.83,110,6.94,120,6.86,135,6.49,150,5.81,152,5.708153
12,39.9,6.048241,52,6.69,60,6.88,75,7.07,90,7.13,110,7.32,120,7.26,135,7,150,6.56,157.4,6.249931
14,39.4,6.121127,52,6.77,60,6.98,75,7.25,90,7.39,110,7.69,120,7.67,135,7.38,150,7.01,169.1,6.497218
16,39.3,6.151141,52,6.81,60,7.02,75,7.35,90,7.64,110,7.95,120,8.1,135,7.82,150,7.38,177.2,6.8682
20,39.9,6.204661,52,6.83,60,7.03,75,7.43,90,7.95,110,8.32,120,8.75,135,8.81,150,8.23,178.1,7.574164

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.92	5.2	5.43	5.37	5.2	5.03	4.52	3.82
8	5.85	6.13	6.33	6.31	6.32	6.16	5.61	4.88
10	6.45	6.65	6.8	6.83	6.94	6.86	6.49	5.81
12	6.69	6.88	7.07	7.13	7.32	7.26	7	6.56
14	6.77	6.98	7.25	7.39	7.69	7.67	7.38	7.01
16	6.81	7.02	7.35	7.64	7.95	8.1	7.82	7.38
20	6.83	7.03	7.43	7.95	8.32	8.75	8.81	8.23

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43°	3.22	146°	3.31
8	41.4°	3.91	150.2°	4.23
10	40.6°	4.41	152°	5.04
12	39.9°	4.64	157.4°	5.77
14	39.4°	4.73	169.1°	6.38
16	39.3°	4.76	177.2°	6.86
20	39.9°	4.76	178.1°	7.57

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°	4.92	5.85	6.45	6.69	6.77	6.81	6.83
60°	5.20	6.13	6.65	6.88	6.98	7.02	7.03
75°	5.43	6.33	6.80	7.07	7.25	7.35	7.43
90°	5.37	6.31	6.83	7.13	7.39	7.64	7.95
110°	5.20	6.32	6.94	7.32	7.69	7.95	8.32
120°	5.03	6.16	6.86	7.26	7.67	8.10	8.75
135°	4.52	5.61	6.49	7.00	7.38	7.82	8.81
150°	3.82	4.88	5.81	6.56	7.01	7.38	8.23