How Sharp Is a Sharp Trailing Edge?

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In a correspondence with Art Rizzi, prof of aeronautics at KTH, I have posed the following question:

  • Is a wing with a rounded trailing edge of radius say 1% of the chord length to be considered as an airfoil with sharp trailing edge allowing lift to be explained by the Kutta-Zhukovsky circulation theory?
  • If so, why? If not, what creates lift for a wing with rounded (or blunt) trailing edge which is the real case?

I have not yet received any clear answer, but I think the question is essential as concerns what keeps airplanes in the air.

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