WHY KNOT — ORC Rating

GPH

688.2

OSN

668.4

LOA

7.5 m

Displacement

1127 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6097

Medium

0.7956

High

0.9133

Triple Offshore

Low

0.7757

Medium

0.9735

High

1.111

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: 12.03 m²

Sails

Mainsail: 20.88 m²
Genoa: 11.51 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 52.5 m²

Design

Type: HELMSMAN 751
Builder: TOPSEL
Designer: NEW CRUISE DESIGN
Year built: 1993
Stability index: 85.3

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.

6,41.8,4.185245,52,4.66,60,4.91,75,5.08,90,5.36,110,5.4,120,5.26,135,4.78,146,4.294136,150,4.11
8,40.6,4.952117,52,5.5,60,5.66,75,5.81,90,6.08,110,6.14,120,6.05,135,5.74,148.2,5.212423,150,5.11
10,38.4,5.384758,52,5.92,60,6.04,75,6.15,90,6.44,110,6.72,120,6.61,135,6.28,150,5.8,150.5,5.779246
12,36.4,5.603224,52,6.17,60,6.33,75,6.5,90,6.67,110,7.25,120,7.26,135,6.84,150,6.21,150.7,6.169235
14,35.8,5.671564,52,6.28,60,6.51,75,6.86,90,6.93,110,7.6,120,7.95,135,7.48,150,6.58,175.7,5.88657
16,35.8,5.696223,52,6.33,60,6.6,75,7.07,90,7.38,110,7.93,120,8.47,135,8.29,150,7.01,175.7,6.237558
20,36.4,5.752312,52,6.42,60,6.7,75,7.23,90,7.93,110,8.6,120,9.51,135,11.22,137.9,11.06505,150,9.48

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.66	4.91	5.08	5.36	5.4	5.26	4.78	4.11
8	5.5	5.66	5.81	6.08	6.14	6.05	5.74	5.11
10	5.92	6.04	6.15	6.44	6.72	6.61	6.28	5.8
12	6.17	6.33	6.5	6.67	7.25	7.26	6.84	6.21
14	6.28	6.51	6.86	6.93	7.6	7.95	7.48	6.58
16	6.33	6.6	7.07	7.38	7.93	8.47	8.29	7.01
20	6.42	6.7	7.23	7.93	8.6	9.51	11.22	9.48

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.8°	3.12	146°	3.56
8	40.6°	3.76	148.2°	4.43
10	38.4°	4.22	150.5°	5.03
12	36.4°	4.51	150.7°	5.38
14	35.8°	4.6	175.7°	5.87
16	35.8°	4.62	175.7°	6.22
20	36.4°	4.63	137.9°	8.21

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