Edge thickness is the width of a blade section at a certain point on the section. The measurement is normally taken a certain distance in from the edge of the airfoil.
The edge thickness methods are LETHCK[2-10] and TETHCK[2-10]. For more information about these methods, see "Calculations ". The methods' corresponding parameters are LE_OFFSET[2-10], TE_OFFSET[2-10], LE_FLAT_SIZE[2-10], and TE_FLAT_SIZE[2-10]. For more information about these parameters, see "Tolerance File Keywords".
Following is an example:
Example of edge thickness
A - LE or TE thickness (edge in)
B - LE
ANGLEOFFSET
This method defines how to pick the point on the mean camber line, which is used for the calculations. In this method, the width point is found by finding the intersection of the mean camber line and a line whose angle is defined by LE_ANGLE or TE_ANGLE. This line is offset from the stack point by LE_OFFSET or TE_OFFSET.
This method is available for the following calculations:
LETHCK2-10
TETHCK2-10
CONCAVE_X
This method defines how to pick the point on the mean camber line, which is used for the calculations.
A point is found on the concave side that has the given X value. A corresponding point is found on the convex side by intersecting the convex curve with the line that passes through the concave point and is orthogonal to the concave curve. The thickness is the distance between the two points.
This method is available for the following calculations:
LETHCK2-10
TETHCK2-10
CONCAVE
The CONCAVE side of the airfoil is used in the calculation (typically, an arc intersection with the spline).
CONVEX and CONCAVE tell which side to use for the LE_DIST, LE_TE, and STACK methods.CONVEX_X
This method defines how to pick the point on the mean camber line, which is used for the calculations.
A point is found on the convex side that has the given X value. A corresponding point is found on the concave side by intersecting the concave curve with the line that passes through the convex point and is orthogonal to the convex curve. The thickness is the distance between the two points.
CONVEX
The CONVEX side of the airfoil is used in the calculation (typically an arc intersection with the spline). CONVEX and CONCAVE tell which side to use for the LE_DIST, LE_TE, and STACK methods.
STACKX-STACKY
The edge thickness is calculated at the intersection of a plane with the X or Y value of LE_OFFSET (or TE_OFFSET), and the mean camber line.