WHY KNOT — ORC Rating

GPH

683.9

OSN

664

LOA

7.5 m

Displacement

1127 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6182

Medium

0.8023

High

0.9188

Triple Offshore

Low

0.7826

Medium

0.979

High

1.1126

Boat Specifications

Dimensions

Length overall: 7.5 m
Beam: 2.42 m
Draft: 1.68 m
Displacement: 1127 kg
Crew weight: 383 kg
Wetted surface: 12.09 m²

Sails

Mainsail: 20.88 m²
Genoa: 11.82 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 52.5 m²

Design

Type: HELMSMAN 751
Builder: TOPSEL
Designer: NEW CRUISE DESIGN
Year built: 1993
Stability index: 83.6

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.

6,41.4,4.279366,52,4.78,60,4.99,75,5.1,90,5.32,110,5.37,120,5.24,135,4.78,145.7,4.297309,150,4.1
8,39.4,4.982312,52,5.55,60,5.71,75,5.79,90,6.07,110,6.16,120,6.06,135,5.73,148.7,5.172865,150,5.11
10,37.5,5.420031,52,5.98,60,6.1,75,6.2,90,6.44,110,6.72,120,6.64,135,6.32,149.8,5.819908,150,5.81
12,36,5.624109,52,6.23,60,6.39,75,6.55,90,6.66,110,7.18,120,7.22,135,6.86,149.6,6.283958,150,6.25
14,35.7,5.68907,52,6.34,60,6.55,75,6.85,90,6.93,110,7.51,120,7.82,135,7.46,150,6.63,174.8,5.914341
16,35.7,5.738326,52,6.41,60,6.65,75,7.04,90,7.29,110,7.83,120,8.38,135,8.22,150,7.02,175.7,6.287699
20,36.4,5.764736,52,6.47,60,6.75,75,7.24,90,7.8,110,8.47,120,9.46,135,11.29,138.7,11.048045,150,9.58

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.78	4.99	5.1	5.32	5.37	5.24	4.78	4.1
8	5.55	5.71	5.79	6.07	6.16	6.06	5.73	5.11
10	5.98	6.1	6.2	6.44	6.72	6.64	6.32	5.81
12	6.23	6.39	6.55	6.66	7.18	7.22	6.86	6.25
14	6.34	6.55	6.85	6.93	7.51	7.82	7.46	6.63
16	6.41	6.65	7.04	7.29	7.83	8.38	8.22	7.02
20	6.47	6.75	7.24	7.8	8.47	9.46	11.29	9.58

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.4°	3.21	145.7°	3.55
8	39.4°	3.85	148.7°	4.42
10	37.5°	4.3	149.8°	5.03
12	36°	4.55	149.6°	5.42
14	35.7°	4.62	174.8°	5.89
16	35.7°	4.66	175.7°	6.27
20	36.4°	4.64	138.7°	8.3

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