Tabula Rasa - NOR10310

Sailing performance analysis for a Banner 28 HR from 1979, built by Banner Både and designed by LarsOrdrerup.

Compare with another boat

8.5

Length (LOA)

meters

2.97

Beam

meters

1.39

Draft

meters

1,502

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

3.60

3.40

8 kt

4.21

4.29

10 kt

4.49

5.04

12 kt

4.59

5.67

14 kt

4.63

6.18

16 kt

4.66

6.56

20 kt

4.64

7.35

24 kt

4.47

9.48

⛵

Identity

NameTabula Rasa

Sail #NOR10310

CountryNOR

BuilderBanner Både

DesignerLarsOrdrerup

Build Year1,979

Series Year—

📏

Dimensions

LOA8.5m

Beam2.97m

Draft1.39m

Disp.1,502kg

WS12.78m²

Crew352kg

⛵

Sail Areas

Genoa19.01m²

Main24.25m²

Spinnaker40.11m²

Total43.3m²

🏆

ORC Rating

GPH670.2

OSN654.9

Triple Offshore

Light

0.8145

Medium

0.9925

Heavy

1.0987

Triple Inshore

Light

0.6396

Medium

0.8223

Heavy

0.9161

📈

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	3.60	4.21	4.49	4.59	4.63	4.66	4.64	4.47
52°	5.38	5.98	6.23	6.33	6.39	6.44	6.50	6.47
60°	5.59	6.11	6.36	6.49	6.57	6.64	6.73	6.74
75°	5.71	6.21	6.51	6.73	6.87	6.98	7.16	7.24
90°	5.63	6.20	6.54	6.84	7.09	7.32	7.68	7.96
110°	5.41	6.18	6.63	7.03	7.41	7.79	8.48	9.15
120°	5.23	6.06	6.54	6.97	7.42	7.95	9.51	10.87
135°	4.70	5.66	6.23	6.65	7.09	7.59	9.41	12.60
150°	3.93	4.95	5.76	6.28	6.67	7.09	8.14	10.95
Run VMG	3.40	4.29	5.04	5.67	6.18	6.56	7.35	9.48

Boat speed (knots) at wind angle / wind speed