Originally Posted by Checkboard
The Radius of Turn = Vsquared / [g.tanθ]
I found 0.5% of GS +0.1 always worked in practical and gives answers very close to the above formula in most normal speeds. 220x 0.005 +0.1 = 1.2 and your answer was 1.3 I believe. Just for speed on the go. Most instructors taught it.
Our JAA test tolerance was 1 nm though even the worst of students never let it much outside of 0.2 on a light aircraft. DME arc in a c172 is a lovely lazy way onto the ILS I thought...