THE PEANUT GALLERY: ORC Rating

GPH

608.8

OSN

593.7

LOA

6.48 m

Displacement

318 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.682

Medium

0.8699

High

1.0308

Triple Offshore

Low

0.8672

Medium

1.099

High

1.2861

Boat Specifications

Dimensions

Length overall: 6.48 m
Beam: 2.34 m
Draft: 1.49 m
Displacement: 318 kg
Crew weight: 340 kg
Wetted surface: 7.29 m²

Sails

Mainsail: 15.83 m²
Genoa: 7.75 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 37.71 m²

Design

Type: VIPER 640
Builder: RONDAR
Designer: BENNET
Year built: 1996
Stability index: -1

Performance data

Polar CSV

Each row is TWS followed by TWA and boat-speed pairs. Paste it directly into Offwind or compatible navigation software.

4,42.1,3.65241,52,4.23,60,4.39,75,4.41,90,4.42,110,4.42,120,4.25,135,3.99,142.6,3.486844,150,3.2
6,42.1,4.878865,52,5.42,60,5.63,75,5.77,90,5.72,110,5.91,120,5.8,135,5.34,142.6,4.921863,150,4.51
8,38.5,5.353893,52,6.02,60,6.3,75,6.63,90,6.6,110,6.94,120,7.02,135,6.44,148.8,5.670099,150,5.6
10,37.8,5.517905,52,6.29,60,6.65,75,7.23,90,7.62,110,7.69,120,8.09,135,7.84,141.3,7.239595,150,6.52
12,37.8,5.619151,52,6.47,60,6.88,75,7.63,90,8.32,110,8.41,120,8.92,135,9.31,141.1,8.763328,150,7.88
14,38.1,5.692973,52,6.6,60,7.07,75,7.97,90,8.83,110,9.37,120,9.69,135,10.5,143,10.104735,150,9.32
16,38.3,5.772345,52,6.71,60,7.24,75,8.26,90,9.26,110,10.22,120,10.4,135,11.45,144.9,11.501562,150,10.87
20,39.3,5.840999,52,6.8,60,7.42,75,8.65,90,9.89,110,11.39,120,11.97,135,13.19,149.7,13.99127,150,13.95
24,40.8,5.772825,52,6.66,60,7.33,75,8.76,90,10.31,110,12.28,120,13.11,135,14.73,150,16.28,153.1,16.214443

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
4	4.23	4.39	4.41	4.42	4.42	4.25	3.99	3.2
6	5.42	5.63	5.77	5.72	5.91	5.8	5.34	4.51
8	6.02	6.3	6.63	6.6	6.94	7.02	6.44	5.6
10	6.29	6.65	7.23	7.62	7.69	8.09	7.84	6.52
12	6.47	6.88	7.63	8.32	8.41	8.92	9.31	7.88
14	6.6	7.07	7.97	8.83	9.37	9.69	10.5	9.32
16	6.71	7.24	8.26	9.26	10.22	10.4	11.45	10.87
20	6.8	7.42	8.65	9.89	11.39	11.97	13.19	13.95
24	6.66	7.33	8.76	10.31	12.28	13.11	14.73	16.28

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
4	42.1°	2.71	142.6°	2.77
6	42.1°	3.62	142.6°	3.91
8	38.5°	4.19	148.8°	4.85
10	37.8°	4.36	141.3°	5.65
12	37.8°	4.44	141.1°	6.82
14	38.1°	4.48	143°	8.07
16	38.3°	4.53	144.9°	9.41
20	39.3°	4.52	149.7°	12.08
24	40.8°	4.37	153.1°	14.46

VPP POLAR · BOAT SPEED BY TWAKT

TRUE WIND ANGLE —

READ AT ANGLE

Hover or tap the chart, or use the slider, to read boat speeds.

True wind speed 4 kt6 kt8 kt10 kt12 kt14 kt16 kt20 kt24 kt

Data table

Boat speed by true wind angle and true wind speed
TWA	Boat speed in 4 kt (kt)	Boat speed in 6 kt (kt)	Boat speed in 8 kt (kt)	Boat speed in 10 kt (kt)	Boat speed in 12 kt (kt)	Boat speed in 14 kt (kt)	Boat speed in 16 kt (kt)	Boat speed in 20 kt (kt)	Boat speed in 24 kt (kt)
0°	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
52°	4.23	5.42	6.02	6.29	6.47	6.60	6.71	6.80	6.66
60°	4.39	5.63	6.30	6.65	6.88	7.07	7.24	7.42	7.33
75°	4.41	5.77	6.63	7.23	7.63	7.97	8.26	8.65	8.76
90°	4.42	5.72	6.60	7.62	8.32	8.83	9.26	9.89	10.31
110°	4.42	5.91	6.94	7.69	8.41	9.37	10.22	11.39	12.28
120°	4.25	5.80	7.02	8.09	8.92	9.69	10.40	11.97	13.11
135°	3.99	5.34	6.44	7.84	9.31	10.50	11.45	13.19	14.73
150°	3.20	4.51	5.60	6.52	7.88	9.32	10.87	13.95	16.28