Heres a formula you can use:

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`(((KNOTS * 0.514444444)^2)/(tan(BANK ANGLE)*9.8))/1852`

9.8 is the speed of gravity in meters per second per second.

1852 is the ammount of meters to a nautical mile

You can punch this into google to calculate:

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`(((%SPEED% * 0.514444444)^2)/(tan %ANGLE% deg*9.8))/1852`

As a general rule:

120knots, 30 degrees is a 0.363NM turn radius.

240knots, 30 degrees is a 1.454NM turn radius.

To do it backwards to get the radius:

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`sqrt(%RADIUS%*1852 * tan (%ANGLE% deg) * 9.8) / 0.5144444444`

~200knots, 30 degrees gives a 1.0nm turn radius

**So know the magic numbers to turn at 30 degrees and you're golden!**(141 for half nm, 200 for a full nm)