Bonnie Lass — ORC Rating

GPH

806.5

OSN

776.6

LOA

7.85 m

Displacement

2177 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.4948

Medium

0.6857

High

0.7954

Triple Offshore

Low

0.6359

Medium

0.8471

High

0.957

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: 15.8 m²

Sails

Mainsail: 12.43 m²
Genoa: 13.67 m²
Spinnaker: 43.4 m²
Asymmetric spinnaker: 0 m²

Design

Type: Sadler 26
Builder: Fortuna, Cape Town
Designer: David Sadler
Year built: 1981
Stability index: 101.7

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.

6,43.6,3.410793,52,3.77,60,3.97,75,4.08,90,4.35,110,4.47,120,4.34,135,3.88,147.9,3.423356,150,3.35
8,41.8,4.077931,52,4.55,60,4.75,75,4.89,90,5.23,110,5.39,120,5.29,135,4.85,150,4.29,151.6,4.228962
10,40.6,4.53066,52,5.07,60,5.27,75,5.46,90,5.78,110,5.98,120,5.92,135,5.62,150,5.09,153.8,4.926117
12,40,4.869169,52,5.45,60,5.64,75,5.83,90,6.04,110,6.33,120,6.32,135,6.11,150,5.73,161,5.351561
14,40,5.091088,52,5.67,60,5.87,75,6.07,90,6.16,110,6.58,120,6.65,135,6.48,150,6.15,173,5.63198
16,40.2,5.158445,52,5.76,60,5.99,75,6.24,90,6.33,110,6.78,120,6.94,135,6.85,150,6.49,177.2,6.017184
20,41.2,5.17002,52,5.77,60,6.03,75,6.4,90,6.66,110,7.04,120,7.4,135,7.59,150,7.19,177.2,6.657949

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	3.77	3.97	4.08	4.35	4.47	4.34	3.88	3.35
8	4.55	4.75	4.89	5.23	5.39	5.29	4.85	4.29
10	5.07	5.27	5.46	5.78	5.98	5.92	5.62	5.09
12	5.45	5.64	5.83	6.04	6.33	6.32	6.11	5.73
14	5.67	5.87	6.07	6.16	6.58	6.65	6.48	6.15
16	5.76	5.99	6.24	6.33	6.78	6.94	6.85	6.49
20	5.77	6.03	6.4	6.66	7.04	7.4	7.59	7.19

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.6°	2.47	147.9°	2.9
8	41.8°	3.04	151.6°	3.72
10	40.6°	3.44	153.8°	4.42
12	40°	3.73	161°	5.06
14	40°	3.9	173°	5.59
16	40.2°	3.94	177.2°	6.01
20	41.2°	3.89	177.2°	6.65

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