- The primary advantage of the wing over a soft sail is that it is easier to control and does not distort. This makes it easier for the trimmers on board to maintain an optimum aerofoil shape in a wide range of conditions.
- The wing-sail trimaran sails upwind and downwind at apparent wind angles of 20 - 30 degrees (monohulls typically sail at 30 - 40)
- The trimaran can sail up to 3 times the wind speed.
söndag 7 mars 2010
Americas Cup 2010: BMW Oracle Wing-Sail
The 33rd 2010 Americas Cup was won 2-0 by the challenger BMW ORACLE trimaran powered by main rigid wing-sail, which showed to be far superior to the soft sail catamaran ALINGHI.
VPLP who designed BMW ORACLE reports that:
This fits with the computational results presented in The Mathematical Secret of Flight and Why It Is Possible to Fly and Why It Is Possible to Sail: With an apparent angle of 30 degrees and a speed of 2 times the wind speed, the effective angle of attack is about 10 degrees, which is an efficient regime for a wing but not for a soft sail. At a wind of 5m/s the BMW ORACLE could beat upwind at 10 m/s about 20 knots. See the 68 m wing-sail! See the performance. Extreme engineering!
a high narrow wing-sail, just as seen. Compare with Omer Wing-Sail.