Change in force in the horizontal direction calculator

The change in force in the horizontal direction, often referred to as the “X-direction,” is related to the aerodynamic behavior of an aircraft’s drag due to changes in angle of attack and other parameters.

• Xw​ is the change in force in the horizontal 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).
• u0​ is the equilibrium velocity (meters per second, m/s).
• CDα​ is the coefficient of drag with respect to angle of attack ($\alpha$).
• CL​ is the coefficient of lift at equilibrium velocity (u=u0​).