Let me be more specific:
- I have a 3D scan of a whale tubercle.
- The tubercle is tapering and twisting along its half span.
- I want to find the mean chord length. Now let us say that my airfoil section is at 10 degrees. So how is the chord length defined?
a) is it a line that directly joins the LE and the TE (chord length has a slant) b) is it the line joining the projection of the LE and TE on a flat plane ( slope of chord line =0)