View single post by Helmut  

Posted: Sat Jan 25th, 2020 12:03 am 


Helmut

The degree of a curve is the degree of curvature and sets the curve radius. So whatever the offset is, it will not affect the curve's radius. The link given in post #2 gives the wrong formula for degree determination in railroad practice, as the chord length of 100' is defined as 1 station, and not the arc. In the following I refer to the terminology outlined here. The deflection angle I of a curve is affected by the offset x, as I is the angular distance between PC and PI. So the thing one can ask for is: 1. "What degree of curvature do I get when I set an offset x and a deflection angle of 15°?" 2. "What deflection angle I do I get when I set an offset x and a curvature of 15°?" The answer to 1. Is straightforward as the degree of curvature is 15° The answer to 2. Can be derived from the formulas given in the link, and renders sin(I/2)=SQRT(x/2R), where R is taken from the curvature table.
____________________ Regards, H. 

