ISIDOROS: ORC Rating

GPH

746.6

OSN

721.4

LOA

9.005 m

Displacement

3299 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5369

Medium

0.7386

High

0.876

Triple Offshore

Low

0.6887

Medium

0.9118

High

1.0403

Boat Specifications

Dimensions

Length overall: 9.005 m
Beam: 2.99 m
Draft: 1.7 m
Displacement: 3299 kg
Crew weight: 450 kg
Wetted surface: 17.88 m²

Sails

Mainsail: 16.07 m²
Genoa: 24.63 m²
Spinnaker: 51.63 m²
Asymmetric spinnaker: 0 m²

Design

Type: FIRST 28
Builder: BENETEAU
Designer: FINOT
Year built: 1981
Stability index: 111

Performance data

Polar CSV

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

6,43.8,3.83784,52,4.24,60,4.47,75,4.63,90,4.57,110,4.66,120,4.53,135,4.13,147.8,3.639831,150,3.56
8,42,4.480957,52,5.02,60,5.3,75,5.49,90,5.56,110,5.68,120,5.54,135,5.06,150,4.49,152.3,4.404821
10,42,5.046123,52,5.64,60,5.88,75,6.05,90,6.2,110,6.29,120,6.21,135,5.91,150,5.31,152.9,5.178537
12,41.2,5.488993,52,6.02,60,6.19,75,6.33,90,6.52,110,6.63,120,6.57,135,6.36,150,6,157.7,5.706814
14,39.9,5.722366,52,6.24,60,6.39,75,6.53,90,6.74,110,6.94,120,6.89,135,6.68,150,6.39,170.9,5.91444
16,39.4,5.823482,52,6.36,60,6.53,75,6.72,90,6.85,110,7.24,120,7.21,135,7,150,6.68,178.1,6.263444
20,39.4,5.875246,52,6.43,60,6.65,75,7,90,7.19,110,7.62,120,7.78,135,7.64,150,7.28,179,6.821039

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.24	4.47	4.63	4.57	4.66	4.53	4.13	3.56
8	5.02	5.3	5.49	5.56	5.68	5.54	5.06	4.49
10	5.64	5.88	6.05	6.2	6.29	6.21	5.91	5.31
12	6.02	6.19	6.33	6.52	6.63	6.57	6.36	6
14	6.24	6.39	6.53	6.74	6.94	6.89	6.68	6.39
16	6.36	6.53	6.72	6.85	7.24	7.21	7	6.68
20	6.43	6.65	7	7.19	7.62	7.78	7.64	7.28

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.8°	2.77	147.8°	3.08
8	42°	3.33	152.3°	3.9
10	42°	3.75	152.9°	4.61
12	41.2°	4.13	157.7°	5.28
14	39.9°	4.39	170.9°	5.84
16	39.4°	4.5	178.1°	6.26
20	39.4°	4.54	179°	6.82

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°	4.24	5.02	5.64	6.02	6.24	6.36	6.43
60°	4.47	5.30	5.88	6.19	6.39	6.53	6.65
75°	4.63	5.49	6.05	6.33	6.53	6.72	7.00
90°	4.57	5.56	6.20	6.52	6.74	6.85	7.19
110°	4.66	5.68	6.29	6.63	6.94	7.24	7.62
120°	4.53	5.54	6.21	6.57	6.89	7.21	7.78
135°	4.13	5.06	5.91	6.36	6.68	7.00	7.64
150°	3.56	4.49	5.31	6.00	6.39	6.68	7.28