Originally Posted by
Banana Joe
I am just looking for a simple rule of thumb to use in the terminal area for a medium sized airliner (A320, 737, etc.) and that would make it easy to calculate when to turn into a DME arc and lead radial to turn off it.
On the 727 we used to use 1% of our groundspeed added to the DME arc distance
as a lead in to start the turn to join it