### 9.1.11. Definitions

The following variables and equations are included to help describe the specialized coordinate systems used by BladeGen.

Z | = | Axial location.
R | = | Radius or radial location.
q or Theta | = | Rotation around Z axis from X towards Y axis (right hand rule).
b or Beta | = | Blade Angle, measured from the axial or tangential direction. Internally, BladeGen always uses the axial definition.
S | = | Fractional distance along a curve (between 0 and 1).
M | = | Distance along meridional curve.
M’ or M-Prime | = | Radius normalized distance along meridional curve.
C | = | True 3D distance along camberline (meanline).
q’ or Theta-Prime | = | Terminology given to describe the integral of R*dTheta. (See equations below)

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