Question: A racing yacht is to be designed with a solid sail that can be treated as half wing. The sail has a NACA 23012 cross-section.

A racing yacht is to be designed with a solid sail that can be treated as half wing. The sail has a NACA 23012 cross-section. The sail is 7.5 m tall and has a root chord of 3 m, and a tip chord of 2 m. When tacking into the wind, the combination of wind speed and forward speed produces a resultant velocity of 25 knots approaching the sail at an angle of attack of 6. Determine the resultant aerodynamic force acting on the sail, using the simplest data available. (Neglect any Reynolds number effects). (Hint: use CL = 0.5, CD = 0.02 for your calculations)

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