Function calculate_pitch_damping_moment 

pub fn calculate_pitch_damping_moment(
    pitch_rate_rad_s: f64,
    velocity_mps: f64,
    air_density_kg_m3: f64,
    caliber_m: f64,
    _length_m: f64,
    mach: f64,
    coeffs: &PitchDampingCoefficients,
) -> f64

Calculate the aerodynamic moment opposing pitch motion