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,