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Oyster 100’ sailplan study

This study conducted on the Oyster 100’ sail utilizing SA-Evolution technology focuses on aerodynamic analysis and optimization of the sailplan. Key inputs included specifications for the blade jib and mainsail, with a true wind speed of 12 knots. Results showcased a significant increase in thrust by 8% while reducing side force and heeling moment, enhancing the overall efficiency of the sailplan. Findings indicate effective sail performance at the target angle of attack, confirming the potential for better sailing dynamics through design optimizations.

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Oyster 100’ sailplan study

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  1. Oyster 100’ sailplan study Study conducted using SA-Evolution, a SMAR-Azure technology Boat: Oyster 100’ Sail: blade jib & mainsail Date: November 24th 2010 Responsible: Sabrina Malpede Contents 1. Aerodynamic Analysis 2. Aerodynamic Optimization

  2. 1. Aerodynamic Analysis INPUT DATA • Design shapes provided by Dolphin Sails • True wind speed 12 kn • Target TWA 43.3° • Target BS 8.93 kn • Heeling angle 10° • Sheeting angle 12.3° jib / 2° main RESULTS • Thrust 11690 N • Side force 48020 N • Heeling moment 894.7 kNm • Thrust Coefficient 0.40 • Side Coefficient 1.64 • Thrust / Side Ratio 0.24 Notes • Sails are flying at appropriate angle of attack • Foresail is developing higher forward thrust Pressure distribution

  3. 2. Aerodynamic Optimization Results INPUT DATA • Target sailing course at 12 TWS (see previous slide) • Sheeting and heeling angles have been kept fixed Jib design shape • Twist and maximum camber has been evenly reduced throughout the foresail Mainsail design shape • Twist has been slightly evenly increased, while camber has not been changed RESULTS • Thrust 12620 N +8.0% • Side force 46770 N - 2.6% • Heeling moment 865.6 kNm - 3.3% • Thrust Coefficient 0.43 +8.0% • Side Coefficient 1.59 - 2.6% • Thrust / Side Ratio 0.27 +13% Conclusions • Even if the thrust is increasing considerably, the side force and the heeling moment are decreasing instead, allowing a much higher overall efficiency of the sailplan

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