Tramontana — ORC Rating

GPH

687.3

OSN

670.2

LOA

9.43 m

Displacement

3500 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6692

Medium

0.9006

High

1.0184

Triple Offshore

Low

0.864

Medium

1.1064

High

1.2237

Boat Specifications

Dimensions

Length overall: 9.43 m
Beam: 3.12 m
Draft: 1.51 m
Displacement: 3500 kg
Crew weight: 454 kg
Wetted surface: 19.4 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.

6,43.2,4.34861,52,4.85,60,5.12,75,5.35,90,5.31,110,5.17,120,5,135,4.52,147.5,3.936488,150,3.83
8,43.5,5.197316,52,5.73,60,6,75,6.19,90,6.18,110,6.18,120,6.03,135,5.51,150,4.82,152.3,4.721064
10,42,5.718939,52,6.26,60,6.44,75,6.57,90,6.64,110,6.68,120,6.59,135,6.29,150,5.68,153.6,5.526331
12,41.2,5.940871,52,6.47,60,6.64,75,6.82,90,6.94,110,7.04,120,6.95,135,6.7,150,6.35,165.4,5.848865
14,40.9,6.006455,52,6.55,60,6.75,75,7.01,90,7.12,110,7.4,120,7.31,135,7.04,150,6.73,180,6.27
16,41.1,6.037979,52,6.58,60,6.8,75,7.14,90,7.36,110,7.73,120,7.69,135,7.41,150,7.05,180,6.65
20,42.1,6.078365,52,6.58,60,6.81,75,7.24,90,7.69,110,8.12,120,8.37,135,8.14,150,7.73,180,7.29

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.85	5.12	5.35	5.31	5.17	5	4.52	3.83
8	5.73	6	6.19	6.18	6.18	6.03	5.51	4.82
10	6.26	6.44	6.57	6.64	6.68	6.59	6.29	5.68
12	6.47	6.64	6.82	6.94	7.04	6.95	6.7	6.35
14	6.55	6.75	7.01	7.12	7.4	7.31	7.04	6.73
16	6.58	6.8	7.14	7.36	7.73	7.69	7.41	7.05
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	43.2°	3.17	147.5°	3.32
8	43.5°	3.77	152.3°	4.18
10	42°	4.25	153.6°	4.95
12	41.2°	4.47	165.4°	5.66
14	40.9°	4.54	180°	6.27
16	41.1°	4.55	180°	6.65
20	42.1°	4.51	180°	7.29

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