Actually,
The Radius of Turn = Vsquared / [g.tanθ]
Where θ is the angle of bank, and V the TAS, you would then need to take the time of the turn to account for the wind effect.
For a 30º AoB turn, this equates fairly accurately to:
Radius = [V/200]squared
Using the circular slide rule (which I carry in the aircraft):
---Radius-------GS
-----+-------------+----
-----GS
-----------400
So, for;
- 100 knots, Radius = 0.25 nm
- 200 knots, radius = 1 nm
- 250 knots, radius = 1.6 nm
... which is why I would start my turn at 1.3 miles or so at 220 knots .. but that's just me
