AIR FORCE — ORC Rating

GPH

660.6

OSN

644.5

LOA

8.309 m

Displacement

1129 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6338

Medium

0.8203

High

0.9249

Triple Offshore

Low

0.8117

Medium

1.0146

High

1.1418

Boat Specifications

Dimensions

Length overall: 8.309 m
Beam: 2.46 m
Draft: 1.34 m
Displacement: 1129 kg
Crew weight: 381 kg
Wetted surface: 12.96 m²

Sails

Mainsail: 17.46 m²
Genoa: 19.37 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 57.29 m²

Design

Type: EXPRESS 27
Builder: ALSBERG
Designer: SCHUMACHER
Year built: 1982

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.

6,44,4.643146,52,5.13,60,5.4,75,5.56,90,5.49,110,5.52,120,5.37,135,4.82,144.2,4.376968,150,4.09
8,41.5,5.394177,52,5.93,60,6.12,75,6.25,90,6.32,110,6.42,120,6.35,135,5.95,147.8,5.306117,150,5.19
10,39.1,5.695536,52,6.29,60,6.46,75,6.62,90,6.79,110,6.97,120,6.97,135,6.65,148.9,6.08455,150,6.02
12,38.9,5.820803,52,6.43,60,6.64,75,6.92,90,7.14,110,7.38,120,7.56,135,7.24,149.2,6.635933,150,6.58
14,39.1,5.888823,52,6.49,60,6.72,75,7.09,90,7.39,110,7.87,120,8.12,135,7.94,146.8,7.278035,150,7.03
16,39.3,5.918535,52,6.53,60,6.79,75,7.23,90,7.66,110,8.39,120,8.62,135,8.82,143.9,8.143666,150,7.6
20,40.5,5.944193,52,6.54,60,6.85,75,7.42,90,8.06,110,9.34,120,10.4,135,11.62,141.3,11.263016,150,10.15
24,43.5,5.914187,52,6.44,60,6.78,75,7.48,90,8.33,110,10.26,120,12.02,135,13.45,145.8,14.073599,150,13.44

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.13	5.4	5.56	5.49	5.52	5.37	4.82	4.09
8	5.93	6.12	6.25	6.32	6.42	6.35	5.95	5.19
10	6.29	6.46	6.62	6.79	6.97	6.97	6.65	6.02
12	6.43	6.64	6.92	7.14	7.38	7.56	7.24	6.58
14	6.49	6.72	7.09	7.39	7.87	8.12	7.94	7.03
16	6.53	6.79	7.23	7.66	8.39	8.62	8.82	7.6
20	6.54	6.85	7.42	8.06	9.34	10.4	11.62	10.15
24	6.44	6.78	7.48	8.33	10.26	12.02	13.45	13.44

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	44°	3.34	144.2°	3.55
8	41.5°	4.04	147.8°	4.49
10	39.1°	4.42	148.9°	5.21
12	38.9°	4.53	149.2°	5.7
14	39.1°	4.57	146.8°	6.09
16	39.3°	4.58	143.9°	6.58
20	40.5°	4.52	141.3°	8.79
24	43.5°	4.29	145.8°	11.64

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