FRI - NOR8104
Sailing performance analysis for a JEANNEAU 51 from 1989, built by Jeanneau and designed by Farr.
Data provided by the Offshore Racing Congress (ORC)
The Jeanneau 51 is a comfort cruiser that shines in heavier winds, reaching a top speed of 9.14 knots in 14 knots of wind. It sails upwind at 7.15 knots in 10 knots of wind, demonstrating solid performance for leisurely cruising. Downwind, it achieves 6.33 knots with its large symmetric spinnaker, which complements the sail plan that includes a large genoa relative to the mainsail.
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)
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.
Identity
Dimensions
Sail Areas
ORC Rating
Rated boat speeds
| Wind Speed (TWS) | |||||||
|---|---|---|---|---|---|---|---|
| 6 kt | 8 kt | 10 kt | 12 kt | 14 kt | 16 kt | 20 kt | |
| Beat VMG | 3.40 | 4.15 | 4.73 | 5.16 | 5.50 | 5.68 | 5.83 |
| 52° | 5.35 | 6.43 | 7.30 | 7.84 | 8.09 | 8.23 | 8.35 |
| 60° | 5.78 | 6.89 | 7.72 | 8.16 | 8.37 | 8.50 | 8.62 |
| 75° | 6.24 | 7.35 | 8.04 | 8.39 | 8.62 | 8.79 | 8.99 |
| 90° | 6.26 | 7.34 | 8.05 | 8.43 | 8.69 | 8.92 | 9.33 |
| 110° | 5.69 | 6.95 | 7.93 | 8.45 | 8.81 | 9.14 | 9.75 |
| 120° | 5.51 | 6.76 | 7.78 | 8.38 | 8.75 | 9.10 | 9.85 |
| 135° | 4.97 | 6.20 | 7.23 | 8.02 | 8.48 | 8.83 | 9.59 |
| 150° | 4.18 | 5.36 | 6.37 | 7.28 | 8.00 | 8.45 | 9.11 |
| Run VMG | 3.62 | 4.64 | 5.53 | 6.33 | 7.05 | 7.66 | 8.54 |
Boat speed (knots) at wind angle / wind speed