| Keyword | Parameters | Description | Data Type |
UNITS |
INCH MM |
Units of the blade |
String |
NUM_SECT |
Number of sections |
Number of sections |
Integer |
SECTION |
Section Points Height [I] [SKEWED] |
Section name, number of points, section height, default section indicator and SKEWED keyword |
String, Integer, Real, String, String |
[NOSE] |
1st point, [2nd point][FORCE][SQUARE][PARTIAL] |
Nose point(s) of airfoil, and end type |
Integer, Integer, String X 3 |
[TAIL] |
1st point, [2nd point][FORCE][SQUARE][PARTIAL] |
Tail point(s) of airfoil, and end type |
Integer, Integer, String X 3 |
OFFSETS |
LE_OFFSET TE_OFFSET |
Edge in offsets for curve definition |
Real, Real |
SECTION
There should be one definition block for each section. The first line of a section block should start with the keyword SECTION, followed by the name of the section, the number of points used to define the section, and the section height. The name of the section cannot have any spaces or underscores ("_"). In general, it should be a combination of alphanumeric characters with no punctuation.
NOSE/TAIL
When two integers are present, they indicate the ends of the concave and convex sides and the beginning of the leading edge and trailing edge. The words SQUARE or PARTIAL should follow the integers to identify which condition is present. Example: "NOSE 1 112 SQUARE". For more information, see "Measuring a Square-End Blade".
If not specified, the nose point is assumed to be the MCL exit point on the end with the largest radius and the trailing edge the opposite.
The FORCE keyword forces the MCL to terminate at a certain point. This applies to certain conditions where the nominal blade data is not well-defined at the end (this often happens in reverse engineering situations).
OFFSETS
If you do not supply the offsets, they are assumed to be twice the end radii.
The LE_OFFSET is the distance from the nose point to the transition point on the mean camber line where the LE is considered to terminate (transition into CV and CC sides).
The TE_OFFSET is the distance from the tail point to the transition point on the mean camber line where the TE is considered to terminate (transition into CV and CC sides).
If you supply offsets in the Tolerance file, they override these offsets.
XYZIJK Data
Following the section header, there should be one line for each point of the section.
Six real numbers define each point, the XYZ location, and the IJK surface normal. The I and J components of the vector are not used unless they are called for in the compensation preferences (they recalculate based on the spline). The K component of the vector plays an important role in probe compensation for blades with significant axial pitch.
The numbers can be comma, space, or tab-delimited.
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