IOR - NOR4711

Sailing performance analysis for a 1/2 TON ONE OFF from 1982, built by Olsen Båtbyggeri and designed by Kjærulf.

Compare with another boat

8.906

Length (LOA)

meters

3.306

Beam

meters

1.624

Draft

meters

2,426

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

4kt

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.

4 kt

2.60

2.37

6 kt

3.51

3.37

8 kt

4.13

4.25

10 kt

4.42

5.02

12 kt

4.53

5.69

14 kt

4.59

6.20

16 kt

4.62

6.59

20 kt

4.63

7.27

24 kt

4.49

8.11

⛵

Identity

NameIOR

Sail #NOR4711

CountryNOR

BuilderOlsen Båtbyggeri

DesignerKjærulf

Build Year1,982

Series Year1,982

📏

Dimensions

LOA8.91m

Beam3.31m

Draft1.62m

Disp.2,426kg

WS14.58m²

Crew369kg

⛵

Sail Areas

Genoa25.21m²

Main31.18m²

Spinnaker54.56m²

Total56.4m²

🏆

ORC Rating

GPHN/A

CDL7.04

APH ToT0.98

APH ToD610.2

OSN0.91

Triple Offshore

Light

0.8015

Medium

0.9874

Heavy

1.0843

Triple Inshore

Light

0.6295

Medium

0.8159

Heavy

0.9123

📈

Rated boat speeds

Wind angle (TWA)

	Wind Speed (TWS)
	4 kt	6 kt	8 kt	10 kt	12 kt	14 kt	16 kt	20 kt	24 kt
Beat VMG	2.60	3.51	4.13	4.42	4.53	4.59	4.62	4.63	4.49
52°	4.04	5.25	5.93	6.23	6.36	6.43	6.48	6.54	6.53
60°	4.27	5.47	6.09	6.38	6.53	6.61	6.67	6.76	6.78
75°	4.40	5.59	6.19	6.52	6.73	6.87	6.97	7.13	7.20
90°	4.28	5.49	6.15	6.53	6.81	7.03	7.21	7.47	7.66
110°	4.01	5.31	6.15	6.61	6.97	7.27	7.52	7.88	8.24
120°	3.81	5.12	6.01	6.52	6.91	7.28	7.64	8.38	9.00
135°	3.33	4.59	5.57	6.23	6.66	7.05	7.44	8.46	10.51
150°	2.74	3.89	4.91	5.75	6.32	6.71	7.07	7.88	9.36
Run VMG	2.37	3.37	4.25	5.02	5.69	6.20	6.59	7.27	8.11

Boat speed (knots) at wind angle / wind speed