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

For an inherently stable rocket, the center of gravity (CG) must be located forward of the center of pressure (CP). This configuration ensures that the rocket will self-correct its flight path when subjected to external disturbances, such as wind or variations in thrust. When the CG is ahead of the CP, any deviation from the intended flight path causes the rocket to experience a restoring moment. This moment effectively steers the rocket back toward its original trajectory.

If the rocket tilts or is pushed off course, the aerodynamic forces acting on the rocket create a torque that rotates it back into alignment. This forward placement of the CG plays a critical role in maintaining stability during flight because it ensures that the aerodynamic forces act to bring the rocket back into line rather than exacerbate the deviation. In contrast, if the CG were behind the CP, the rocket would be unstable and tend to continue rotating away from its flight path, leading to potentially uncontrollable behavior.

Overall, the relationship between the CG and CP is fundamental in rocketry, as it directly influences the stability and control characteristics of the rocket in flight.