4.4.1.1 Front velocity

According to [21–23], the thrust force generates the frontal displacement of the airplane. This displacement can be explained using the classical physical laws considering to Ft like a punctual force applied to the mass of the airplane. The following equation is obtained:

$$V\_{\chi} = V\_{i\chi} + \left(\frac{V\_{o} \cdot k\_{h}}{m\_{a}}\right) \cdot t \tag{7}$$

where Ft is the thrust force; Ve is the engine speed or helix; kh is the thrust constant; ma is the mass of the airplane; Vx is the front speed; Vix is the initial velocity of the airplane; and t is the time.
