Originally Posted by
Le Flaneur
Formula 1: Turn radius [in nm] = (True Airspeed [in knots] ÷ 60) - 2 or (True airspeed in nm/minute × 10) – 2
Formula 2: Turn radius [in nm] R = (True airspeed [in knots] ÷ 60)^2 ÷ 10 or (True airspeed in nm/minute)^2 × 10
Those formulae don't make sense.
In each case, the bit before the "or" is OK, but the part after should use True Mach, not TAS nm/min.