Tramontana — ORC Rating

GPH

685.8

OSN

669.2

LOA

9.43 m

Displacement

3500 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.67

Medium

0.9024

High

1.021

Triple Offshore

Low

0.8675

Medium

1.108

High

1.2252

Boat Specifications

Dimensions

Length overall: 9.43 m
Beam: 3.12 m
Draft: 1.51 m
Displacement: 3500 kg
Crew weight: 455 kg
Wetted surface: 19.41 m²

Sails

Mainsail: 30.16 m²
Genoa: 25.36 m²
Spinnaker: 51.6 m²
Asymmetric spinnaker: 0 m²

Design

Type: Dehler 31
Builder: Dehler
Designer: vd Stadt & prtnrs
Year built: 1985

Velocity Prediction

Polar CSV

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

6,43.1,4.355196,52,4.88,60,5.19,75,5.45,90,5.4,110,5.21,120,5.03,135,4.53,147.2,3.961613,150,3.84
8,42.5,5.126972,52,5.75,60,6.02,75,6.22,90,6.23,110,6.21,120,6.06,135,5.53,150,4.83,152,4.734143
10,41.9,5.72341,52,6.26,60,6.44,75,6.58,90,6.64,110,6.69,120,6.6,135,6.31,150,5.69,153.5,5.531132
12,41.1,5.945087,52,6.48,60,6.65,75,6.81,90,6.93,110,7.03,120,6.95,135,6.71,150,6.36,165.3,5.851534
14,40.7,6.014765,52,6.56,60,6.75,75,7.01,90,7.12,110,7.4,120,7.31,135,7.04,150,6.73,180,6.27
16,40.8,6.050238,52,6.59,60,6.8,75,7.14,90,7.36,110,7.73,120,7.68,135,7.41,150,7.04,180,6.65
20,41.8,6.076654,52,6.58,60,6.81,75,7.24,90,7.69,110,8.12,120,8.37,135,8.14,150,7.73,180,7.29

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.88	5.19	5.45	5.4	5.21	5.03	4.53	3.84
8	5.75	6.02	6.22	6.23	6.21	6.06	5.53	4.83
10	6.26	6.44	6.58	6.64	6.69	6.6	6.31	5.69
12	6.48	6.65	6.81	6.93	7.03	6.95	6.71	6.36
14	6.56	6.75	7.01	7.12	7.4	7.31	7.04	6.73
16	6.59	6.8	7.14	7.36	7.73	7.68	7.41	7.04
20	6.58	6.81	7.24	7.69	8.12	8.37	8.14	7.73

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.1°	3.18	147.2°	3.33
8	42.5°	3.78	152°	4.18
10	41.9°	4.26	153.5°	4.95
12	41.1°	4.48	165.3°	5.66
14	40.7°	4.56	180°	6.27
16	40.8°	4.58	180°	6.65
20	41.8°	4.53	180°	7.29

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