SEVEN SPIRIT: ORC Rating

GPH

692.8

OSN

670.7

LOA

7.64 m

Displacement

1343 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6639

Medium

0.9047

High

1.0335

Triple Offshore

Low

0.852

Medium

1.0976

High

1.2421

Boat Specifications

Dimensions

Length overall: 7.64 m
Beam: 2.38 m
Draft: 1.58 m
Displacement: 1343 kg
Crew weight: 383 kg
Wetted surface: 13.13 m²

Sails

Mainsail: 18.9 m²
Genoa: 16 m²
Spinnaker: 41.08 m²
Asymmetric spinnaker: 0 m²

Design

Type: SURPRISE MK2
Builder: ARCHAMBAULT
Designer: JOUBERT/NIVELT
Year built: 1977

Performance data

Polar CSV

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

6,41.6,4.252485,52,4.78,60,5.01,75,5.19,90,5.11,110,5.14,120,4.96,135,4.41,146.9,3.843772,150,3.72
8,40.5,5.063085,52,5.64,60,5.81,75,5.92,90,6,110,6.04,120,5.93,135,5.44,150,4.72,150.7,4.678527
10,38,5.532919,52,6.06,60,6.18,75,6.28,90,6.44,110,6.52,120,6.42,135,6.15,150,5.59,152,5.50429
12,36.2,5.67562,52,6.27,60,6.43,75,6.62,90,6.71,110,7.05,120,6.93,135,6.58,150,6.19,165.6,5.730019
14,35.5,5.736287,52,6.35,60,6.55,75,6.9,90,7.03,110,7.53,120,7.51,135,7.08,150,6.59,180,6.09
16,35.4,5.778235,52,6.4,60,6.63,75,7.05,90,7.38,110,7.86,120,8.16,135,7.64,150,7.05,180,6.47
20,35.7,5.81221,52,6.44,60,6.68,75,7.19,90,7.79,110,8.48,120,9.18,135,9.26,150,8.15,180,7.33

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.78	5.01	5.19	5.11	5.14	4.96	4.41	3.72
8	5.64	5.81	5.92	6	6.04	5.93	5.44	4.72
10	6.06	6.18	6.28	6.44	6.52	6.42	6.15	5.59
12	6.27	6.43	6.62	6.71	7.05	6.93	6.58	6.19
14	6.35	6.55	6.9	7.03	7.53	7.51	7.08	6.59
16	6.4	6.63	7.05	7.38	7.86	8.16	7.64	7.05
20	6.44	6.68	7.19	7.79	8.48	9.18	9.26	8.15

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.6°	3.18	146.9°	3.22
8	40.5°	3.85	150.7°	4.08
10	38°	4.36	152°	4.86
12	36.2°	4.58	165.6°	5.55
14	35.5°	4.67	180°	6.09
16	35.4°	4.71	180°	6.47
20	35.7°	4.72	180°	7.33

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 6 kt8 kt10 kt12 kt14 kt16 kt20 kt

Data table

Boat speed by true wind angle and true wind speed
TWA	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)
0°	0.00	0.00	0.00	0.00	0.00	0.00	0.00
52°	4.78	5.64	6.06	6.27	6.35	6.40	6.44
60°	5.01	5.81	6.18	6.43	6.55	6.63	6.68
75°	5.19	5.92	6.28	6.62	6.90	7.05	7.19
90°	5.11	6.00	6.44	6.71	7.03	7.38	7.79
110°	5.14	6.04	6.52	7.05	7.53	7.86	8.48
120°	4.96	5.93	6.42	6.93	7.51	8.16	9.18
135°	4.41	5.44	6.15	6.58	7.08	7.64	9.26
150°	3.72	4.72	5.59	6.19	6.59	7.05	8.15