The sine spiral transition segment is a special case of a spiral where the curvature rate of change is a sine function and the terms are dependent on the length L measured from the inflection point. The parameter value is defined as the deflection i.e. bearing angle &Theta.
The values of its individual terms are identical and equal to the length of the segment L:
SineTerm = L
LinearTerm = L
The following diagram shows the generic classes and relationships used when applying this concept.