© SMAR-Azure Ltd, 2010

Contents

1. Aerodynamic Analysis

2. Aerodynamic Optimization

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

© SMAR-Azure Ltd, 2010

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

Pre

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© SMAR-Azure Ltd, 2010

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