VOR Radial intersections are a common practice in instrument flights.
To intercept a VOR radial one needs to establish an heading for a required intersection angle. Depending on this angle, on the speed, on the bank angle and on the distance (DME), one can determine the anticipation, in still air, to be established on the required radial. The aim is not no overshoot nor undershoot this radial.
The mobile application allows you to determine these anticipations. Have fun!