Most importantly, I believe that this formula is right no matter what shape the curved track is, it doesn't have to be circular. If the flexi turns through 45 degrees, the difference in rail length is: My answer is that the difference in length is given by the following formula:ĭifference = 2 x pi x 16.5 x (angle the flexi turns)/360ĭifference = 103.7 x (angle the flex turns)/360 But the length of the flexi-track is its length half way between the rails, so how much longer is the outer rail The advantage that you can tell with high precision where every piece of track on the layout is (within 3mm) and, for flexi-track, how long it is. Why do I want to know? Well, my layout is designed in anyrail which has ![]() ![]() I've had my thinking cap on (not always a good idea), trying to find out the size of the difference in length between the inner and outer rails of a piece of curved flexi-track.
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