Bonnie Lass — ORC Rating

GPH

767.4

OSN

743.3

LOA

7.85 m

Displacement

2177 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5909

Medium

0.8113

High

0.9261

Triple Offshore

Low

0.7609

Medium

0.9982

High

1.1087

Boat Specifications

Dimensions

Length overall: 7.85 m
Beam: 2.74 m
Draft: 1.41 m
Displacement: 2177 kg
Crew weight: 240 kg
Wetted surface: 16.36 m²

Sails

Mainsail: 12.39 m²
Genoa: 21.53 m²
Spinnaker: 43.4 m²
Asymmetric spinnaker: 0 m²

Design

Type: Sadler 26
Builder: Fortuna, Cape Town
Designer: David Sadler
Year built: 1981

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.

6,44,3.795147,52,4.2,60,4.45,75,4.62,90,4.55,110,4.59,120,4.46,135,3.99,147.7,3.525535,150,3.44
8,41.7,4.419811,52,4.96,60,5.22,75,5.44,90,5.41,110,5.57,120,5.46,135,4.98,150,4.36,151.4,4.305323
10,41.2,4.957371,52,5.54,60,5.74,75,5.9,90,5.98,110,6.1,120,6.05,135,5.8,150,5.2,151.5,5.131898
12,40.8,5.310471,52,5.83,60,5.99,75,6.14,90,6.2,110,6.4,120,6.37,135,6.19,150,5.86,160.2,5.50548
14,40.2,5.39411,52,5.94,60,6.11,75,6.3,90,6.37,110,6.68,120,6.69,135,6.49,150,6.2,180,5.74
16,40,5.41744,52,5.98,60,6.16,75,6.42,90,6.55,110,6.89,120,7.02,135,6.83,150,6.48,180,6.11
20,41.4,5.385869,52,5.95,60,6.16,75,6.5,90,6.86,110,7.14,120,7.48,135,7.55,150,7.12,180,6.66

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.2	4.45	4.62	4.55	4.59	4.46	3.99	3.44
8	4.96	5.22	5.44	5.41	5.57	5.46	4.98	4.36
10	5.54	5.74	5.9	5.98	6.1	6.05	5.8	5.2
12	5.83	5.99	6.14	6.2	6.4	6.37	6.19	5.86
14	5.94	6.11	6.3	6.37	6.68	6.69	6.49	6.2
16	5.98	6.16	6.42	6.55	6.89	7.02	6.83	6.48
20	5.95	6.16	6.5	6.86	7.14	7.48	7.55	7.12

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	44°	2.73	147.7°	2.98
8	41.7°	3.3	151.4°	3.78
10	41.2°	3.73	151.5°	4.51
12	40.8°	4.02	160.2°	5.18
14	40.2°	4.12	180°	5.74
16	40°	4.15	180°	6.11
20	41.4°	4.04	180°	6.66

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