Bertha - NOR10494

Sailing performance analysis for a Dufour 34 Standard from 2002, built by Dufour and designed by UmbertoFelici.

Compare with another boat

10.3

Length (LOA)

meters

3.48

Beam

meters

1.93

Draft

meters

5,231

Displacement

kilograms

Total Sail Area

square meters

Data provided by the Offshore Racing Congress (ORC)

Sailing performance as a polar diagram

A polar diagram shows boat speed at different wind angles and wind speeds. The distance from center represents boat speed in knots, and the angle represents the boats angle to the wind. The wind speed is shown as true wind speed (TWS), not apparent wind speed. Likewise, the wind angle is shown as true wind angle (TWA), not apparent wind angle.

Beat: Sailing upwind (toward the wind)

Beam Reach: Sailing across the wind

Run: Sailing downwind (away from the wind)

Wind Speed

6kt

8kt

10kt

12kt

14kt

16kt

20kt

24kt

VMG Performance

Wind Speed (columns): True wind speed (TWS) in knots - the actual wind speed, not the apparent wind you feel on deck.

VMG (Velocity Made Good) is your effective speed toward your destination, not your actual boat speed.

Beat VMG (top bars): Speed made good when sailing upwind. Higher is better - it means you're reaching the windward mark faster.

Run VMG (bottom bars): Speed made good when sailing downwind. Higher is better - it means you're reaching the leeward mark faster.

6 kt

3.25

3.38

8 kt

3.96

4.33

10 kt

4.50

5.16

12 kt

4.87

5.89

14 kt

5.06

6.48

16 kt

5.14

6.98

20 kt

5.17

7.68

24 kt

5.10

8.34

⛵

Identity

NameBertha

Sail #NOR10494

CountryNOR

BuilderDufour

DesignerUmbertoFelici

Build Year2,002

Series Year—

📏

Dimensions

LOA10.3m

Beam3.48m

Draft1.93m

Disp.5,231kg

WS25.06m²

Crew610kg

⛵

Sail Areas

Genoa30.77m²

Main31.24m²

Spinnaker78.34m²

Total62.0m²

🏆

ORC Rating

GPH652.4

OSN630

Triple Offshore

Light

0.7916

Medium

1.0441

Heavy

1.1785

Triple Inshore

Light

0.6135

Medium

0.8506

Heavy

0.9923

📈

Rated boat speeds

Wind angle (TWA)

	Wind Speed (TWS)
	6 kt	8 kt	10 kt	12 kt	14 kt	16 kt	20 kt	24 kt
Beat VMG	3.25	3.96	4.50	4.87	5.06	5.14	5.17	5.10
52°	4.99	5.93	6.54	6.90	7.10	7.19	7.26	7.26
60°	5.26	6.19	6.74	7.06	7.27	7.39	7.48	7.51
75°	5.44	6.36	6.89	7.21	7.45	7.64	7.86	7.96
90°	5.32	6.32	6.97	7.31	7.50	7.73	8.14	8.40
110°	5.34	6.46	7.10	7.50	7.84	8.14	8.53	8.82
120°	5.18	6.31	7.01	7.44	7.82	8.18	8.85	9.35
135°	4.67	5.79	6.65	7.18	7.56	7.93	8.72	9.72
150°	3.91	5.00	5.96	6.71	7.18	7.54	8.25	9.05
Run VMG	3.38	4.33	5.16	5.89	6.48	6.98	7.68	8.34

Boat speed (knots) at wind angle / wind speed