the vis man' area for circling is determined by drawing arcs centred on each runway threshold. the radius of the arcs is related to;
1, ac cat
2, speed for each ac cat
3 wind speed - assumed 25 kt thru the turn
4,bank angle - the lesser of 20 degrees or rate 1
effectively;
cat a max spd 100 radius 1.68
cat b 135 2.66
cat c 180 4.20
cat d 205 5.28
cat e 240 6.94
IN