I was wondering about what options I should use when I run my fins in FinSim. Under the menu CN-Alpha there are 3 or 4 options you can choose. There is Classical 2D Lift Slope, Barrowman 3D Lift Slope, NACA TN 4197 Method. I have tried all of them and the smallest numbers for divergence and flutter came from NACA TN 4197. A very close 2nd was Classical 2D. When I used Barrowman 3D the numbers got much bigger than the first two. Does anybody know which option I should be using and Why? Also CN reference to Body Tube or Fin Area?