SILFO: ORC Rating

GPH

703.9

OSN

683.1

LOA

9.43 m

Displacement

3613 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5713

Medium

0.7833

High

0.9057

Triple Offshore

Low

0.7393

Medium

0.9644

High

1.0841

Boat Specifications

Dimensions

Length overall: 9.43 m
Beam: 3.1 m
Draft: 1.49 m
Displacement: 3613 kg
Crew weight: 450 kg
Wetted surface: 20.16 m²

Sails

Mainsail: 25.83 m²
Genoa: 25.63 m²
Spinnaker: 56.26 m²
Asymmetric spinnaker: 0 m²

Design

Type: DEHLER 31
Builder: DEHLER
Designer: VAN DE STADT
Year built: 1982

Performance data

Polar CSV

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

6,43.5,4.094437,52,4.59,60,4.88,75,5.11,90,5.06,110,5.06,120,4.9,135,4.43,147,3.887104,150,3.76
8,42,4.803909,52,5.42,60,5.74,75,5.97,90,6.01,110,6.09,120,5.94,135,5.42,150,4.75,152,4.666189
10,42.2,5.440031,52,6.04,60,6.25,75,6.4,90,6.54,110,6.6,120,6.52,135,6.22,150,5.6,153,5.465729
12,40.5,5.786383,52,6.35,60,6.51,75,6.66,90,6.84,110,6.95,120,6.87,135,6.64,150,6.28,161.5,5.873522
14,39.8,5.948325,52,6.51,60,6.68,75,6.87,90,7.05,110,7.31,120,7.23,135,6.97,150,6.66,180,6.17
16,39.4,5.978775,52,6.57,60,6.78,75,7.05,90,7.18,110,7.66,120,7.62,135,7.34,150,6.97,180,6.57
20,40.5,5.996797,52,6.58,60,6.81,75,7.25,90,7.61,110,8.09,120,8.33,135,8.1,150,7.66,180,7.19

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.59	4.88	5.11	5.06	5.06	4.9	4.43	3.76
8	5.42	5.74	5.97	6.01	6.09	5.94	5.42	4.75
10	6.04	6.25	6.4	6.54	6.6	6.52	6.22	5.6
12	6.35	6.51	6.66	6.84	6.95	6.87	6.64	6.28
14	6.51	6.68	6.87	7.05	7.31	7.23	6.97	6.66
16	6.57	6.78	7.05	7.18	7.66	7.62	7.34	6.97
20	6.58	6.81	7.25	7.61	8.09	8.33	8.1	7.66

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.5°	2.97	147°	3.26
8	42°	3.57	152°	4.12
10	42.2°	4.03	153°	4.87
12	40.5°	4.4	161.5°	5.57
14	39.8°	4.57	180°	6.17
16	39.4°	4.62	180°	6.57
20	40.5°	4.56	180°	7.19

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°	4.59	5.42	6.04	6.35	6.51	6.57	6.58
60°	4.88	5.74	6.25	6.51	6.68	6.78	6.81
75°	5.11	5.97	6.40	6.66	6.87	7.05	7.25
90°	5.06	6.01	6.54	6.84	7.05	7.18	7.61
110°	5.06	6.09	6.60	6.95	7.31	7.66	8.09
120°	4.90	5.94	6.52	6.87	7.23	7.62	8.33
135°	4.43	5.42	6.22	6.64	6.97	7.34	8.10
150°	3.76	4.75	5.60	6.28	6.66	6.97	7.66