Why complicate things? Because it's interesting...
Recently I had to do some sums to calculate the flight path to do a 90 degree (plus or minus WCA) rolling wings level at an exact lat/lon at an exact heading at a time as accurately as possible.
I calculated the nil wind turn, then backcalculated the entry to the turn. Then I moved this into wind by the appropriate vector to get the entry point.
That's the easy bit.
You have to also consider:
Angle of Bank - in an Airbus you'll get a different angle of bank if you are in HDG or NAV...
Which then follows on to the roll rate into the turn... What is the roll rate? How does this affect the radius for the few seconds it takes to get the normal angle of bank?
It gets very complicated very quickly.
The post flight GPS feed has shown that I was 300 metres out, at 37,000 feet at M.08! The pax were
happy with that
