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Is the serrated trailing edge beneficial only where there is a step in the middle of a panel or would you also incorporate it into the the trailing edge of a Kamm such as at the truncation of his tail? I have read that vortex inducers are more beneficial when located in the middle of a panel in order to form a vortex which is attached to the panel and has momentum to follow the same line after leaving the back rather than curling in. Are serrations at the trailing edge more for noise reduction at the expense of increased drag?
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