Function stagnation_drag_coefficient 

pub fn stagnation_drag_coefficient(mach: f64) -> Result<f64, AeroError>

Pressure drag of a blunt circular cylinder face, (C_D•)_stag = 0.85 q_stag/q on its frontal area (Niskanen 2009 eq. B.2).

Errors

As stagnation_pressure_ratio.