BIG BROTHER — ORC Rating

GPH

763.9

OSN

740.5

LOA

7.02 m

Displacement

1089 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.543

Medium

0.7244

High

0.8251

Triple Offshore

Low

0.6927

Medium

0.8821

High

0.9918

Boat Specifications

Dimensions

Length overall: 7.02 m
Beam: 2.87 m
Draft: 1.48 m
Displacement: 1089 kg
Crew weight: 266 kg
Wetted surface: 11.46 m²

Sails

Mainsail: 15.37 m²
Genoa: 11.69 m²
Spinnaker: 32.18 m²
Asymmetric spinnaker: 0 m²

Design

Type: PROTO 1/4 TON 1981
Designer: Ron Holland
Year built: 1984

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.

6,42.7,3.864395,52,4.29,60,4.5,75,4.63,90,4.7,110,4.73,120,4.58,135,4.14,147.5,3.640065,150,3.55
8,41,4.505044,52,5.02,60,5.2,75,5.32,90,5.49,110,5.52,120,5.41,135,5.04,150,4.49,151.8,4.413917
10,39.8,4.894027,52,5.43,60,5.58,75,5.71,90,5.93,110,5.99,120,5.9,135,5.63,150,5.22,156.9,4.979227
12,39.2,5.16166,52,5.68,60,5.83,75,5.99,90,6.25,110,6.38,120,6.29,135,6.03,150,5.71,170,5.239601
14,39,5.327185,52,5.86,60,6.03,75,6.23,90,6.45,110,6.74,120,6.66,135,6.41,150,6.08,178.1,5.643102
16,39.2,5.381031,52,5.95,60,6.16,75,6.43,90,6.57,110,7.09,120,7.07,135,6.78,150,6.43,178.6,6.001792
20,40.6,5.465767,52,6,60,6.25,75,6.65,90,6.98,110,7.68,120,8.19,135,7.88,150,7.21,178.6,6.651986
24,42.2,5.494026,52,5.99,60,6.27,75,6.75,90,7.29,110,8.23,120,9.65,135,10.46,143.8,9.579158,150,8.93

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.29	4.5	4.63	4.7	4.73	4.58	4.14	3.55
8	5.02	5.2	5.32	5.49	5.52	5.41	5.04	4.49
10	5.43	5.58	5.71	5.93	5.99	5.9	5.63	5.22
12	5.68	5.83	5.99	6.25	6.38	6.29	6.03	5.71
14	5.86	6.03	6.23	6.45	6.74	6.66	6.41	6.08
16	5.95	6.16	6.43	6.57	7.09	7.07	6.78	6.43
20	6	6.25	6.65	6.98	7.68	8.19	7.88	7.21
24	5.99	6.27	6.75	7.29	8.23	9.65	10.46	8.93

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.7°	2.84	147.5°	3.07
8	41°	3.4	151.8°	3.89
10	39.8°	3.76	156.9°	4.58
12	39.2°	4	170°	5.16
14	39°	4.14	178.1°	5.64
16	39.2°	4.17	178.6°	6
20	40.6°	4.15	178.6°	6.65
24	42.2°	4.07	143.8°	7.73

Loading polar chart…