Hi Ivan,
It would really be cool to be able to tailor-make decent props for a given plane more easily!
The pictures of graphs in your posts are generated by your spread-sheet, I suppose... It also helps to visualize what´s going on.
The non-linear graph sounds logical, as it would save on points where it was more of a straight line so as to use them to smooth out more curved places.
Good night!
Aleatorylamp