Cassandra: ORC Rating

GPH

650.9

OSN

632.6

LOA

9.99 m

Displacement

4710 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.6219

Medium

0.8462

High

0.9714

Triple Offshore

Low

0.8035

Medium

1.0418

High

1.1636

Boat Specifications

Dimensions

Length overall: 9.99 m
Beam: 3.37 m
Draft: 2.01 m
Displacement: 4710 kg
Crew weight: 540 kg
Wetted surface: 23.71 m²

Sails

Mainsail: 34.34 m²
Genoa: 26.08 m²
Spinnaker: 71.05 m²
Asymmetric spinnaker: 0 m²

Design

Type: First 34.7
Builder: Farr
Designer: Benetau
Year built: 2005

Performance data

Polar CSV

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

6,42.8,4.443052,52,5,60,5.29,75,5.53,90,5.47,110,5.48,120,5.31,135,4.79,145.5,4.271191,150,4.06
8,41.2,5.209891,52,5.9,60,6.21,75,6.44,90,6.5,110,6.59,120,6.44,135,5.89,150,5.115323
10,40.9,5.887385,52,6.54,60,6.75,75,6.91,90,7.05,110,7.14,120,7.06,135,6.73,150,6.03,152,5.923341
12,39.8,6.208645,52,6.85,60,7.03,75,7.19,90,7.31,110,7.51,120,7.44,135,7.18,150,6.76,158,6.417282
14,39.4,6.302302,52,6.97,60,7.17,75,7.4,90,7.49,110,7.88,120,7.83,135,7.54,150,7.17,180,6.59
16,39.4,6.354066,52,7.02,60,7.23,75,7.56,90,7.74,110,8.16,120,8.25,135,7.94,150,7.51,180,7.05
20,40.1,6.471253,52,7.06,60,7.26,75,7.7,90,8.17,110,8.53,120,8.93,135,8.83,150,8.29,180,7.73

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5	5.29	5.53	5.47	5.48	5.31	4.79	4.06
8	5.9	6.21	6.44	6.5	6.59	6.44	5.89	5.11
10	6.54	6.75	6.91	7.05	7.14	7.06	6.73	6.03
12	6.85	7.03	7.19	7.31	7.51	7.44	7.18	6.76
14	6.97	7.17	7.4	7.49	7.88	7.83	7.54	7.17
16	7.02	7.23	7.56	7.74	8.16	8.25	7.94	7.51
20	7.06	7.26	7.7	8.17	8.53	8.93	8.83	8.29

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	42.8°	3.26	145.5°	3.52
8	41.2°	3.92	150°	4.43
10	40.9°	4.45	152°	5.23
12	39.8°	4.77	158°	5.95
14	39.4°	4.87	180°	6.59
16	39.4°	4.91	180°	7.05
20	40.1°	4.95	180°	7.73

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°	5.00	5.90	6.54	6.85	6.97	7.02	7.06
60°	5.29	6.21	6.75	7.03	7.17	7.23	7.26
75°	5.53	6.44	6.91	7.19	7.40	7.56	7.70
90°	5.47	6.50	7.05	7.31	7.49	7.74	8.17
110°	5.48	6.59	7.14	7.51	7.88	8.16	8.53
120°	5.31	6.44	7.06	7.44	7.83	8.25	8.93
135°	4.79	5.89	6.73	7.18	7.54	7.94	8.83
150°	4.06	5.11	6.03	6.76	7.17	7.51	8.29