Bladed Knowledge Base

In the Blade Geometry section of the User Manual, there are diagrams illustrating the blade cross-section, showing such things as aerodynamic twist and neutral axis position relative to the chord. But how is each of these cross-sections oriented in 3D space? Are they all perpendicular to the pitch axis, i.e. parallel to the blade flange? Or is each section perpendicular to the local orientation of the neutral axis?

These cross-sections are perpendicular to the local orientation of the neutral axis. It follows that they are in general not parallel to each other, as their orientation depends on both pre-bend and dynamic deflection of the blade.