🪂 DragModel

Drag Models¶

The drag subsystem models aerodynamic resistance via Ballistic Coefficients that reference standard drag tables (G1, G7, etc.), or custom Mach–\(C_d\) pairs.

• DragModel: Single-BC scaling of a reference drag table; optional weight/diameter/length for spin-drift calculations.
• BCPoint + DragModelMultiBC(...): Interpolate BC across velocity/Mach to better match measured data.
• Helpers: [make_data_points][py_ballisticcalc.drag_model.make_data_points], [sectional_density][py_ballisticcalc.drag_model.sectional_density], [linear_interpolation][py_ballisticcalc.drag_model.linear_interpolation].

Use with Ammo(dm=DragModel(...)) to parameterize the projectile.

Standard Models¶

Standard Tables¶

• TableG1: Flat-base bullet (most common sporting ammunition)
• TableG7: Boat-tail, spitzer (long-range match bullets)
• TableG2: Conical, banded, boat-tail artillery projectile
• TableG5: Round-nose, boat-tail
• TableG6: Flat-base, spire-point
• TableG8: Flat-base, 10 caliber secant ogive
• TableGI: Ingalls G1
• TableGS: 9/16" smooth sphere
• TableRA4: .22LR 40gr

Standard Projectile Profiles¶

Standard Drag Curves¶