BLUE DUDE: ORC Rating

GPH

605.5

OSN

590.1

LOA

8.4 m

Displacement

1639 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.7024

Medium

0.8955

High

1.0411

Triple Offshore

Low

0.8926

Medium

1.0984

High

1.2584

Boat Specifications

Dimensions

Length overall: 8.4 m
Beam: 2.92 m
Draft: 2.48 m
Displacement: 1639 kg
Crew weight: 450 kg
Wetted surface: 15.89 m²

Sails

Mainsail: 34.01 m²
Genoa: 16.18 m²
Spinnaker: 0 m²
Asymmetric spinnaker: 89.66 m²

Design

Type: YOUNG Rocket 8.4
Builder: FAIR Tom
Designer: YOUNG Jim
Year built: 1986
Stability index: 128.8

Performance data

Polar CSV

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

6,41.8,4.936443,52,5.54,60,5.83,75,6.03,90,6.11,110,6.2,120,6.09,135,5.43,143.9,4.925804,150,4.59
8,39.9,5.774506,52,6.35,60,6.5,75,6.62,90,6.66,110,6.94,120,6.89,135,6.54,147.8,5.896999,150,5.76
10,37.2,5.988476,52,6.62,60,6.81,75,7.05,90,7.09,110,7.47,120,7.64,135,7.28,150,6.56,150.9,6.511995
12,36.7,6.086491,52,6.75,60,7,75,7.43,90,7.64,110,7.9,120,8.26,135,8.16,148.7,7.326275,150,7.23
14,36.4,6.125032,52,6.82,60,7.12,75,7.68,90,8.14,110,8.32,120,8.79,135,9.2,145.7,8.400937,150,8.01
16,36,6.192701,52,6.9,60,7.18,75,7.85,90,8.53,110,8.72,120,9.31,135,10.28,144.6,9.569052,150,9.01
20,36.6,6.252978,52,7.03,60,7.43,75,8.12,90,8.97,110,9.93,120,10.35,135,12,144.9,12.84606,150,12.14

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	5.54	5.83	6.03	6.11	6.2	6.09	5.43	4.59
8	6.35	6.5	6.62	6.66	6.94	6.89	6.54	5.76
10	6.62	6.81	7.05	7.09	7.47	7.64	7.28	6.56
12	6.75	7	7.43	7.64	7.9	8.26	8.16	7.23
14	6.82	7.12	7.68	8.14	8.32	8.79	9.2	8.01
16	6.9	7.18	7.85	8.53	8.72	9.31	10.28	9.01
20	7.03	7.43	8.12	8.97	9.93	10.35	12	12.14

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	41.8°	3.68	143.9°	3.98
8	39.9°	4.43	147.8°	4.99
10	37.2°	4.77	150.9°	5.69
12	36.7°	4.88	148.7°	6.26
14	36.4°	4.93	145.7°	6.94
16	36°	5.01	144.6°	7.8
20	36.6°	5.02	144.9°	10.51

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°	5.54	6.35	6.62	6.75	6.82	6.90	7.03
60°	5.83	6.50	6.81	7.00	7.12	7.18	7.43
75°	6.03	6.62	7.05	7.43	7.68	7.85	8.12
90°	6.11	6.66	7.09	7.64	8.14	8.53	8.97
110°	6.20	6.94	7.47	7.90	8.32	8.72	9.93
120°	6.09	6.89	7.64	8.26	8.79	9.31	10.35
135°	5.43	6.54	7.28	8.16	9.20	10.28	12.00
150°	4.59	5.76	6.56	7.23	8.01	9.01	12.14