Understanding Aerodynamics Arguing From The Real Physics Pdf -

(( M = V/a ), where ( a ) is the speed of sound): characterizes compressibility effects. At low Mach numbers, density changes are negligible and the flow can be approximated as incompressible . At transonic and supersonic speeds, compressibility leads to shock waves and wave drag.

Don't just calculate lift using ; understand why the CLcap C sub cap L changes based on flow physics. understanding aerodynamics arguing from the real physics pdf

L = (1/2) * ρ * v^2 * Cl * A