Helix - Spiral Specification(GH)

##
Helix - Spiral Specification (GH)

    Purpose: To generate a helix or spiral of wire segments

    Card:

             Cols        Parameter
            ----------------------
             1- 2        GH
             3- 5        I1 - ITG
             6-10        I2 - NS
            11-20        F1 - S
            21-30        F2 - HL
            31-40        F3 - A1
            41-50        F4 - B1
            51-60        F5 - A2
            61-70        F6 - B2
            71-80        F7 - RAD

    Parameters:

        Integers

               ITG (11) - Tag number assigned to all segments of the helix or
                            spiral.
               NS  (12) - Number of segments into which the helix or spiral
                            will be divided.

        Floating Point

               S   (F1) - Spacing between turns.
               HL  (F2) - Total length of the helix.
               A1  (F3) - Radius in x at z = 0.
               B1  (F4) - Radius in y at z = 0.
               A2  (F5) - Radius in x at z = HL.
               B2  (F6) - Radius in y at z = HL.
               RAD (F7) - Radius of wire.

Notes:
- Structure will be a helix if A2 = A1 and HL > 0.
- Structure will be a spiral if A2 = A1 and HL = 0.
  - Unless it has been fixed in the codes in circulation, the use of HL=0 for a flat spiral will result in division by zero in NEC-2. GH was a non-official addition to NEC-2
- HL negative gives a left-handed helix.
- HL positive gives a right-handed helix.

This file was last modified on Monday,