Reminders and definitions
Aerospace propulsion - Mathematical and physical tools

Let's start by reviewing the forces involved and the conventional axes associated with flight.  .

The simplified equations (in three degrees of freedom) of external ballistics (more commonly referred to as artillery and rocketry) or flight mechanics (more commonly referred to as aviation) allow the forces and accelerations of the moving object in question to be broken down into different axes. The sum of the torque of the...