Sirene - NOR11649
Sailing performance analysis for a First 31.7 LR from 2006, built by Beneteau and designed by Finot.
Data provided by the Offshore Racing Congress (ORC) · Certificate issued 12/08/2026
This cruiser-racer is built for versatility and delivers a solid 5.8 knots upwind in 10 knots of breeze. With a symmetric spinnaker, it aims to catch up on downwind legs, though it faces challenges in this area. The sail plan is well-balanced, with a jib that complements the mainsail nicely.
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.
Measured sails
Measurements
🏁 Race Results 🥈1 🥉1
| Date | Event | Result | Class | Skipper |
|---|---|---|---|---|
| 2026 | ||||
| 02.09.2026 | Asker Seilforening - Onsdagsserie høst 2026 | 2/8🥈 | Liten =< 1.0700 | Siri Sorteberg |
| 17.06.2026 | Asker Seilforening - Onsdagsserie vår 2026 | 3/8🥉 | Liten =< 1.0700 | Siri Sorteberg |
| 29.05.2026 | Oslofjorden Rundt 2026 | 13/13 | Full Crew | Siri SORTEBERG |
| 20.05.2026 | Asker og Bærum Seilforening Superonsdag 2026 | 9/24 | Liten Klasse | Siri Sorteberg |
| 2025 | ||||
| 10.09.2025 | Asker seilforening Klubbmesterskap Storbåt | 8/11 | Liten Klasse | Siri Sorteberg |
| 23.08.2025 | Sooningen 2025 | 6/12 | NOR rating | Siri SORTEBERG |
| 13.08.2025 | Asker Seilforening - Onsdagsserie høst | 7/12 | Liten =< 1.0700 | Siri Sorteberg |
| 14.05.2025 | Asker Seilforening og Bærum Seilforening Superonsdag | 21/31 | LITEN | Siri Sorteberg |
| 30.04.2025 | Asker Seilforening - Onsdagsserie vår | 9/12 | LITEN =< 1.0700 | Siri Sorteberg |
| 2024 | ||||
| 04.09.2024 | Superonsdager Bærum og Asker 2024 | 10/41 | Klasse F - APH <1,07 | Siri SORTEBERG |
| 07.06.2024 | Oslofjorden Rundt | 7/8 | Full crew | Siri SORTEBERG |
Race results from manage2sail.com & sailracesystem.no
Identity
Dimensions
Sail Areas
ORC Rating
Rated boat speeds
| Wind Speed (TWS) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 4 kt | 6 kt | 8 kt | 10 kt | 12 kt | 14 kt | 16 kt | 20 kt | 24 kt | |
| Beat VMG | 2.24 | 3.20 | 3.91 | 4.42 | 4.74 | 4.87 | 4.93 | 4.95 | 4.87 |
| 52° | 3.51 | 4.89 | 5.81 | 6.38 | 6.70 | 6.85 | 6.92 | 6.98 | 6.96 |
| 60° | 3.76 | 5.15 | 6.05 | 6.57 | 6.86 | 7.04 | 7.12 | 7.20 | 7.21 |
| 75° | 3.93 | 5.30 | 6.21 | 6.71 | 7.02 | 7.24 | 7.41 | 7.58 | 7.67 |
| 90° | 3.80 | 5.18 | 6.13 | 6.76 | 7.10 | 7.32 | 7.56 | 7.93 | 8.14 |
| 110° | 3.63 | 5.13 | 6.23 | 6.87 | 7.27 | 7.62 | 7.92 | 8.33 | 8.65 |
| 120° | 3.48 | 4.94 | 6.04 | 6.76 | 7.20 | 7.58 | 7.96 | 8.72 | 9.30 |
| 135° | 3.02 | 4.42 | 5.51 | 6.38 | 6.93 | 7.33 | 7.72 | 8.62 | 9.89 |
| 150° | 2.51 | 3.75 | 4.83 | 5.76 | 6.49 | 6.97 | 7.34 | 8.10 | 9.10 |
| Run VMG | 2.17 | 3.25 | 4.19 | 5.00 | 5.72 | 6.31 | 6.77 | 7.48 | 8.18 |
Boat speed (knots) at wind angle / wind speed