► Impeller | Blade properties
On page Spans number of span and their distribution are defined.
By default the meridional lines are equally spaced between hub and shroud (linear distribution curve). Using the context menu, the curve type can be set to Bezier curve. If this option is chosen two control points can be manipulated to generate a certain span distribution. The span positions are illustrated as meridional lines in the Meridian diagram behind the distribution curve.