For an inherently stable rocket, where should the center of gravity (CG) be located relative to the center of pressure (CP)?

In rocketry, stability is primarily influenced by the locations of the center of gravity (CG) and the center of pressure (CP). For a rocket to maintain stable flight, the CG must be located forward of the CP. This arrangement is crucial because it ensures that any aerodynamic forces acting on the rocket will create a restoring moment if the rocket experiences a disturbance or deviation from its flight path.

When the CG is forward of the CP, aerodynamic forces exerted on the rocket (particularly during flight) lead to an automatic correction mechanism. If the rocket tips or pitches up or down, the airflow around the rocket's body produces a force that causes the rocket to return to a straight flight path. This is similar to how a weather vane works, where the weight at the bottom (CG) pulls it back to a stable position.

This relationship creates a stable equilibrium where the rocket can recover from minor disturbances, promoting safe and controlled ascent and descent. Understanding this principle is essential for anyone involved in rocketry, particularly for achieving safe and effective launches.