Astra: ORC Rating

GPH

793.1

OSN

769.6

LOA

8.281 m

Displacement

1814 kg

Triple-Number Ratings

Lower is faster

Triple Inshore

Low

0.5115

Medium

0.6919

High

0.7835

Triple Offshore

Low

0.6615

Medium

0.8563

High

0.9448

Boat Specifications

Dimensions

Length overall: 8.281 m
Beam: 1.88 m
Draft: 1.28 m
Displacement: 1814 kg
Crew weight: 250 kg
Wetted surface: 14.27 m²

Sails

Mainsail: 16.12 m²
Genoa: 9.5 m²
Spinnaker: 35.09 m²
Asymmetric spinnaker: 0 m²

Design

Type: Tumlaren
Builder: Unknown
Designer: Knud H. Reimers
Year built: 1934
Stability index: 137.7

Performance data

Polar CSV

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

6,43.5,3.6395,52,4.03,60,4.24,75,4.37,90,4.62,110,4.67,120,4.41,135,3.92,146.6,3.473687,150,3.34
8,41.2,4.266263,52,4.79,60,5.01,75,5.2,90,5.43,110,5.6,120,5.49,135,4.94,150,4.31,151.1,4.272018
10,40.2,4.647838,52,5.24,60,5.46,75,5.68,90,5.81,110,6.06,120,6.04,135,5.76,150,5.17,152.3,5.059896
12,40.5,4.852671,52,5.44,60,5.68,75,5.93,90,6.03,110,6.34,120,6.39,135,6.2,150,5.83,160.1,5.50895
14,40.6,4.938946,52,5.54,60,5.78,75,6.07,90,6.23,110,6.54,120,6.69,135,6.58,150,6.23,174.8,5.733597
16,40.8,4.993428,52,5.6,60,5.84,75,6.15,90,6.39,110,6.7,120,6.94,135,6.95,150,6.58,178.4,6.112383
20,41.8,5.070586,52,5.64,60,5.89,75,6.24,90,6.57,110,6.95,120,7.28,135,7.71,150,7.35,178.4,6.782644

Wind Speed	52°	60°	75°	90°	110°	120°	135°	150°
6	4.03	4.24	4.37	4.62	4.67	4.41	3.92	3.34
8	4.79	5.01	5.2	5.43	5.6	5.49	4.94	4.31
10	5.24	5.46	5.68	5.81	6.06	6.04	5.76	5.17
12	5.44	5.68	5.93	6.03	6.34	6.39	6.2	5.83
14	5.54	5.78	6.07	6.23	6.54	6.69	6.58	6.23
16	5.6	5.84	6.15	6.39	6.7	6.94	6.95	6.58
20	5.64	5.89	6.24	6.57	6.95	7.28	7.71	7.35

Wind Speed	Beat Angle	Beat VMG	Run Angle	Run VMG
6	43.5°	2.64	146.6°	2.9
8	41.2°	3.21	151.1°	3.74
10	40.2°	3.55	152.3°	4.48
12	40.5°	3.69	160.1°	5.18
14	40.6°	3.75	174.8°	5.71
16	40.8°	3.78	178.4°	6.11
20	41.8°	3.78	178.4°	6.78

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°	4.03	4.79	5.24	5.44	5.54	5.60	5.64
60°	4.24	5.01	5.46	5.68	5.78	5.84	5.89
75°	4.37	5.20	5.68	5.93	6.07	6.15	6.24
90°	4.62	5.43	5.81	6.03	6.23	6.39	6.57
110°	4.67	5.60	6.06	6.34	6.54	6.70	6.95
120°	4.41	5.49	6.04	6.39	6.69	6.94	7.28
135°	3.92	4.94	5.76	6.20	6.58	6.95	7.71
150°	3.34	4.31	5.17	5.83	6.23	6.58	7.35