America’s Cup – AC72 Platform Aerodynamics

Platform Platform aerodynamics was key to performance in the AC72’s. Early on we realised that we couldn’t just look at the wing and platform in isolation. Using the platform to end-plate the wing increased the efficiency of the wing 25% and as speed increased and we chased ever lower centre of effort the platform aero only became more important. But as with everything in yachts there was a trade off, larger fairings increased the efficiency of the total aero package and provided lift but also reduced the dynamic stability of the yacht and provided bow up trim moment. A difficult design problem especially when working around the pre-existing structure!

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