DEMOSTHENE: ORC Rating

GPH

654.6

OSN

635

LOA

9.24 m

Displacement

3790 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6201

Medium

0.8406

High

0.9638

Triple Offshore

Low

0.7993

Medium

1.0356

High

1.1605

Boat Specifications

Dimensions

Length overall: 9.24 m
Beam: 3.2 m
Draft: 1.9 m
Displacement: 3790 kg
Crew weight: 567 kg
Wetted surface: 21.51 m²

Sails

Mainsail: 30.36 m²
Genoa: 23.39 m²
Spinnaker: 70.91 m²
Asymmetric spinnaker: 80.86 m²

Design

Type: ELAN 310
Builder: ELAN MARINE
Designer: HUMPHREYS Rob
Year built: 2009
Stability index: 115.3

Performance data

Polar CSV

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

6,43.8,4.489025,52,4.97,60,5.24,75,5.41,90,5.42,110,5.48,120,5.3,135,4.74,144.8,4.258731,150,4.02
8,41.8,5.298628,52,5.89,60,6.14,75,6.3,90,6.43,110,6.55,120,6.42,135,5.9,147.3,5.252458,150,5.11
10,40,5.809062,52,6.46,60,6.65,75,6.79,90,6.97,110,7.13,120,7.05,135,6.74,147.8,6.168804,150,6.02
12,39,6.073505,52,6.74,60,6.92,75,7.1,90,7.25,110,7.56,120,7.53,135,7.23,150,6.67,158.2,6.332891
14,38.7,6.188893,52,6.88,60,7.08,75,7.33,90,7.43,110,7.94,120,7.99,135,7.68,150,7.13,170,6.56981
16,38.4,6.252445,52,6.95,60,7.17,75,7.5,90,7.7,110,8.25,120,8.43,135,8.15,150,7.53,177.2,6.958307
20,38.8,6.313051,52,7.01,60,7.25,75,7.7,90,8.12,110,8.69,120,9.25,135,9.29,150,8.38,177.2,7.719216

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.97	5.24	5.41	5.42	5.48	5.3	4.74	4.02
8	5.89	6.14	6.3	6.43	6.55	6.42	5.9	5.11
10	6.46	6.65	6.79	6.97	7.13	7.05	6.74	6.02
12	6.74	6.92	7.1	7.25	7.56	7.53	7.23	6.67
14	6.88	7.08	7.33	7.43	7.94	7.99	7.68	7.13
16	6.95	7.17	7.5	7.7	8.25	8.43	8.15	7.53
20	7.01	7.25	7.7	8.12	8.69	9.25	9.29	8.38

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.8°	3.24	144.8°	3.48
8	41.8°	3.95	147.3°	4.42
10	40°	4.45	147.8°	5.22
12	39°	4.72	158.2°	5.88
14	38.7°	4.83	170°	6.47
16	38.4°	4.9	177.2°	6.95
20	38.8°	4.92	177.2°	7.71

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°	4.97	5.89	6.46	6.74	6.88	6.95	7.01
60°	5.24	6.14	6.65	6.92	7.08	7.17	7.25
75°	5.41	6.30	6.79	7.10	7.33	7.50	7.70
90°	5.42	6.43	6.97	7.25	7.43	7.70	8.12
110°	5.48	6.55	7.13	7.56	7.94	8.25	8.69
120°	5.30	6.42	7.05	7.53	7.99	8.43	9.25
135°	4.74	5.90	6.74	7.23	7.68	8.15	9.29
150°	4.02	5.11	6.02	6.67	7.13	7.53	8.38