BLUES: ORC Rating

GPH

800.5

OSN

775.7

LOA

8.31 m

Displacement

2650 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.4951

Medium

0.6798

High

0.8017

Triple Offshore

Low

0.6413

Medium

0.8521

High

0.9688

Boat Specifications

Dimensions

Length overall: 8.31 m
Beam: 2.81 m
Draft: 1.6 m
Displacement: 2650 kg
Crew weight: 450 kg
Wetted surface: 15.66 m²

Sails

Mainsail: 15.46 m²
Genoa: 20.93 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 39.26 m²

Design

Type: DUFOUR 27
Builder: DUFOUR
Designer: MICHEL DUFOUR
Year built: 1972
Stability index: 120.5

Performance data

Polar CSV

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

6,44.4,3.555069,52,3.93,60,4.17,75,4.31,90,4.46,110,4.4,120,4.21,135,3.8,144.8,3.45104,150,3.25
8,43.2,4.293738,52,4.75,60,4.98,75,5.14,90,5.39,110,5.33,120,5.15,135,4.75,145.2,4.371922,150,4.14
10,42,4.776996,52,5.32,60,5.53,75,5.69,90,5.94,110,5.92,120,5.82,135,5.5,145.1,5.121003,150,4.85
12,41.1,5.14887,52,5.67,60,5.85,75,6.01,90,6.25,110,6.29,120,6.22,135,5.99,146.2,5.607806,150,5.38
14,40,5.35217,52,5.89,60,6.05,75,6.22,90,6.45,110,6.58,120,6.53,135,6.32,150,5.77,172.6,5.173086
16,39.6,5.450912,52,5.99,60,6.16,75,6.37,90,6.58,110,6.84,120,6.82,135,6.62,150,6.08,173.9,5.631888
20,40.3,5.506981,52,6.04,60,6.23,75,6.54,90,6.75,110,7.3,120,7.39,135,7.16,150,6.55,176.6,6.210932

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	3.93	4.17	4.31	4.46	4.4	4.21	3.8	3.25
8	4.75	4.98	5.14	5.39	5.33	5.15	4.75	4.14
10	5.32	5.53	5.69	5.94	5.92	5.82	5.5	4.85
12	5.67	5.85	6.01	6.25	6.29	6.22	5.99	5.38
14	5.89	6.05	6.22	6.45	6.58	6.53	6.32	5.77
16	5.99	6.16	6.37	6.58	6.84	6.82	6.62	6.08
20	6.04	6.23	6.54	6.75	7.3	7.39	7.16	6.55

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	44.4°	2.54	144.8°	2.82
8	43.2°	3.13	145.2°	3.59
10	42°	3.55	145.1°	4.2
12	41.1°	3.88	146.2°	4.66
14	40°	4.1	172.6°	5.13
16	39.6°	4.2	173.9°	5.6
20	40.3°	4.2	176.6°	6.2

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°	3.93	4.75	5.32	5.67	5.89	5.99	6.04
60°	4.17	4.98	5.53	5.85	6.05	6.16	6.23
75°	4.31	5.14	5.69	6.01	6.22	6.37	6.54
90°	4.46	5.39	5.94	6.25	6.45	6.58	6.75
110°	4.40	5.33	5.92	6.29	6.58	6.84	7.30
120°	4.21	5.15	5.82	6.22	6.53	6.82	7.39
135°	3.80	4.75	5.50	5.99	6.32	6.62	7.16
150°	3.25	4.14	4.85	5.38	5.77	6.08	6.55