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Is an airfoil more effective if the trailing edge is sharper?
Yes. Due to its shape and Bernoulli's principle, an airfoil will have lower pressure air on top and higher pressure air underneath it. If the trailing edge was round, it would make it easier for the stronger, higher pressure air to bleed into the upper surface, reducing lift. However, if the trailing edge is sharp, it prevents this because air has a hard time going around sharp edges, air can’t make sharp turns.