In the standard pack of curves there
are 3 making up 90 degrees.
Thus each curve will take up 30
degrees
The angles A B C D E F will all be the
same as they are the same distance from the centre of the circle
There are 180 degree in total for a
triangle
Therefore A + B + 30 = 180 degrees
as A = B
Then A + A = 180 -30 degrees
thus A + A = 150 degrees
therefore A = 75 degrees
I then make up FULL SIZED paper templates
for the radius of the curve where X is the radius in my case, mainly 600mm,
measured from the centre of the circle to the centre line of the track marked
with the dashed line.
If one uses 3 sections of track for each
curve or bend flexible track to follow the centre line of each section only
the length of the section will change for the change in radius the angles
( A B C D E F ) stay the same at 75 degrees.
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