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The math to verify Mr. Philip Johnson is given below. The maximum bank angle for a normal category aircraft is 60deg at 2G's. The formula for turn radius is

        V^2
R  = ----------
     G*tan(bank)
given
  V=168900(ft/sec) = 1000kt * 1.68
  G=32.2(ft/sec)
  tan(bank) = 1.7(60deg) 
  R=(1690^2) / (32.2 * 1.7) = 52175(ft) = 9.8mi

19.76.4mi diameter = 9.8(radius) x 2

The math to verify Mr. Philip Johnson is given below. The maximum bank angle for a normal category aircraft is 60deg at 2G's. The formula for turn radius is

$R = \frac{V^2}{G\cdot tan(bank)}$

given

$V = 168900(ft/sec) = 1000kt \cdot 1.68$
$G = 32.2(ft/sec)$
$tan(bank) = 1.7(60deg) $
$R = (1690^2) / (32.2 * 1.7) = 52175(ft) = 9.8mi$
$19.76.4mi$ diameter = $9.8(radius) \cdot 2$

The math to verify Mr. Philip Johnson is given below. The maximum bank angle for a normal category aircraft is 60deg at 2G's. The formula for turn radius is

        V^2
R  = ----------
     G*tan(bank)
given
  V=168900(ft/sec) = 1000kt * 1.68
  G=32.2(ft/sec)
  tan(bank) = 1.7(60deg) 
  R=(1690^2) / (32.2 * 1.7) = 52175(ft)

9.8(radius) x 2 = 19.76.4mi

The math to verify Mr. Philip Johnson is given below. The maximum bank angle for a normal category aircraft is 60deg at 2G's. The formula for turn radius is

        V^2
R  = ----------
     G*tan(bank)
given
  V=168900(ft/sec) = 1000kt * 1.68
  G=32.2(ft/sec)
  tan(bank) = 1.7(60deg) 
  R=(1690^2) / (32.2 * 1.7) = 52175(ft) = 9.8mi

19.76.4mi diameter = 9.8(radius) x 2

The maximum bank angle for a normal category aircraft is 60deg at 2G's. The formula for turn radius is

R  =    V^2
     ----------
     G*tan(bank)
given
  V=168900(ft/sec) = 1000kt * 1.68
  G=32.2(ft/sec)
  tan(bank) = 1.7(60deg) 
  R=(1690^2) / (32.2 * 1.7) = 52175(ft)

9.8(radius) x 2 = 19.76.4mi

The math to verify Mr. Philip Johnson is given below. The maximum bank angle for a normal category aircraft is 60deg at 2G's. The formula for turn radius is

        V^2
R  = ----------
     G*tan(bank)
given
  V=168900(ft/sec) = 1000kt * 1.68
  G=32.2(ft/sec)
  tan(bank) = 1.7(60deg) 
  R=(1690^2) / (32.2 * 1.7) = 52175(ft)

9.8(radius) x 2 = 19.76.4mi