X-tra — ORC Rating | RegattaPages

GPH

698.9

OSN

678.1

LOA

7.927 m

Displacement

1806 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5934

Medium

0.7972

High

0.9002

Triple Offshore

Low

0.7606

Medium

0.9641

High

1.0706

Boat Specifications

Dimensions

Length overall: 7.927 m
Beam: 2.86 m
Draft: 1.39 m
Displacement: 1806 kg
Crew weight: 352 kg
Wetted surface: 14.34 m²

Sails

Mainsail: 21.11 m²
Genoa: 16.94 m²
Spinnaker: 50.16 m²
Asymmetric spinnaker: 0 m²

Design

Type: X-79
Builder: X-Yachts
Designer: N. Jeppesen
Year built: 1979
Stability index: 99.6

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.

6,42.9,4.327392,52,4.8,60,5.04,75,5.17,90,5.15,110,5.19,120,5.03,135,4.51,146,3.944333,150,3.78
8,40.8,5.046268,52,5.6,60,5.77,75,5.88,90,5.98,110,6.05,120,5.94,135,5.48,150,4.8,150.5,4.779655
10,38.8,5.479009,52,6.01,60,6.14,75,6.25,90,6.36,110,6.5,120,6.43,135,6.16,150,5.65,153.7,5.476937
12,37.6,5.641876,52,6.2,60,6.34,75,6.5,90,6.56,110,6.86,120,6.84,135,6.58,150,6.22,164.6,5.798181
14,37.5,5.722545,52,6.29,60,6.46,75,6.69,90,6.78,110,7.18,120,7.23,135,6.98,150,6.6,177.2,6.107291
16,37.5,5.772964,52,6.34,60,6.53,75,6.83,90,7.01,110,7.45,120,7.67,135,7.41,150,6.98,179,6.470986
20,38.2,5.815308,52,6.39,60,6.6,75,6.98,90,7.38,110,7.91,120,8.62,135,8.83,150,7.85,178.4,7.172797

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.8	5.04	5.17	5.15	5.19	5.03	4.51	3.78
8	5.6	5.77	5.88	5.98	6.05	5.94	5.48	4.8
10	6.01	6.14	6.25	6.36	6.5	6.43	6.16	5.65
12	6.2	6.34	6.5	6.56	6.86	6.84	6.58	6.22
14	6.29	6.46	6.69	6.78	7.18	7.23	6.98	6.6
16	6.34	6.53	6.83	7.01	7.45	7.67	7.41	6.98
20	6.39	6.6	6.98	7.38	7.91	8.62	8.83	7.85

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.9°	3.17	146°	3.27
8	40.8°	3.82	150.5°	4.16
10	38.8°	4.27	153.7°	4.91
12	37.6°	4.47	164.6°	5.59
14	37.5°	4.54	177.2°	6.1
16	37.5°	4.58	179°	6.47
20	38.2°	4.57	178.4°	7.17

Loading polar chart…