I wanted to share my Regression equation for calculating Drag coefficient:
\(Y = a1 + {b1\over ln(x)}+ {c1\over ln(x)^2}+ {d1\over ln(x)^3}+ {e1\over ln(x)^4}+ { f1 \over ln(x)^5}\)
Where:
Y = Drag Coefficient
x = Drag Coefficient x (Re)2
a1 = -2.71
b1 = 101.72
c1 = -1309.58
d1 = 7839.31
e1 = -14897.30
f1 = 9989.59