Spiral Definition

Half Cosine Spiral Definition

This spiral definition is also known as Japanese Sine or Sine Half-Wavelength Diminishing Tangent Curve.

Where

x	distance along the x-axis, the tangent (m);
y	offset distance from the x-axis (m);
X	length of transition curve along the tangent, the x-axis (m);
R	curve radius of the circular curve within the full body of the curve (m).

Czech Cubic Parabola Definition

Unlike in other spiral definitions, the user input spiral length in Czech Cubic Parabola definition refers to the tangent length. When user inputs a value of 10m this value should interpreted as tangent length of spiral and not the element length. You can see this in the drawing above.