Change in force in the vertical direction calculator

The change in force in the vertical direction, often referred to as the “Z-direction,” is related to the aerodynamic behavior of an aircraft’s lift characteristics due to changes in velocity and other parameters.

• Zu​ is the change in force in the vertical direction (newtons, N).
• $Q$ is the dynamic pressure (pascals, Pa).
• $s$ is the reference area of the aircraft (square meters, m²).
• $m$ is the mass of the aircraft (kilograms, kg).
• 0u0​ is the equilibrium velocity (meters per second, m/s).
• CLu​ is the coefficient of lift with respect to changes in velocity $u$.
• CL​ is the coefficient of lift at the equilibrium velocity u=u0​.