NAUTA: ORC Rating

GPH

714.6

OSN

690.9

LOA

9.8 m

Displacement

4087 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5631

Medium

0.7736

High

0.9138

Triple Offshore

Low

0.7232

Medium

0.9516

High

1.0802

Boat Specifications

Dimensions

Length overall: 9.8 m
Beam: 3.23 m
Draft: 1.76 m
Displacement: 4087 kg
Crew weight: 540 kg
Wetted surface: 19.99 m²

Sails

Mainsail: 19.16 m²
Genoa: 27.07 m²
Spinnaker: 62.75 m²
Asymmetric spinnaker: 0 m²

Design

Type: FIRST 305
Builder: BENETEAU
Designer: J. BERRET
Year built: 1986
Stability index: 114.5

Performance data

Polar CSV

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

6,43.8,4.03181,52,4.46,60,4.7,75,4.87,90,4.81,110,4.91,120,4.77,135,4.36,147.5,3.841633,150,3.74
8,41.8,4.681573,52,5.28,60,5.56,75,5.75,90,5.83,110,5.97,120,5.82,135,5.33,150,4.71,151.4,4.658405
10,41.8,5.285214,52,5.9,60,6.13,75,6.29,90,6.44,110,6.54,120,6.47,135,6.18,150,5.56,152,5.470313
12,40.8,5.719985,52,6.26,60,6.43,75,6.56,90,6.75,110,6.87,120,6.82,135,6.61,150,6.26,157.7,5.966215
14,39,5.919094,52,6.47,60,6.61,75,6.76,90,6.94,110,7.17,120,7.13,135,6.92,150,6.63,171.8,6.142803
16,38.7,6.035131,52,6.6,60,6.75,75,6.93,90,7.04,110,7.47,120,7.46,135,7.24,150,6.92,178.1,6.49357
20,38.7,6.099199,52,6.67,60,6.88,75,7.22,90,7.4,110,7.85,120,8.07,135,7.92,150,7.53,179,7.051074

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.46	4.7	4.87	4.81	4.91	4.77	4.36	3.74
8	5.28	5.56	5.75	5.83	5.97	5.82	5.33	4.71
10	5.9	6.13	6.29	6.44	6.54	6.47	6.18	5.56
12	6.26	6.43	6.56	6.75	6.87	6.82	6.61	6.26
14	6.47	6.61	6.76	6.94	7.17	7.13	6.92	6.63
16	6.6	6.75	6.93	7.04	7.47	7.46	7.24	6.92
20	6.67	6.88	7.22	7.4	7.85	8.07	7.92	7.53

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.8°	2.91	147.5°	3.24
8	41.8°	3.49	151.4°	4.09
10	41.8°	3.94	152°	4.83
12	40.8°	4.33	157.7°	5.52
14	39°	4.6	171.8°	6.08
16	38.7°	4.71	178.1°	6.49
20	38.7°	4.76	179°	7.05

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°	4.46	5.28	5.90	6.26	6.47	6.60	6.67
60°	4.70	5.56	6.13	6.43	6.61	6.75	6.88
75°	4.87	5.75	6.29	6.56	6.76	6.93	7.22
90°	4.81	5.83	6.44	6.75	6.94	7.04	7.40
110°	4.91	5.97	6.54	6.87	7.17	7.47	7.85
120°	4.77	5.82	6.47	6.82	7.13	7.46	8.07
135°	4.36	5.33	6.18	6.61	6.92	7.24	7.92
150°	3.74	4.71	5.56	6.26	6.63	6.92	7.53