Function cone_normal_force_slope 

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

A cone’s normal-force slope at α → 0, per radian on its base area, interpolated linearly between the table’s angles and Mach numbers; below Mach 3 its Mach 3 row, above 10 its Mach 10 row. The slopes are TN 3527’s Fig. 2 to 24°, and NASA SP-3007’s tables of the same theory from there to 30° (ADR-042: cone slopes past Fig. 2’s edge).

Errors

• AeroError::Domain for a negative or non-finite half-angle, or a Mach number that isn’t finite and above 1.
• AeroError::Unsupported for a half-angle past the tables’ 30°.