Tripoli Rocketry Association Tripoli Mentoring Program (TMP) Practice Test 2025 - Free Rocketry Mentoring Practice Questions and Study Guide

When the Center of Gravity (CG) is behind the Center of Pressure (CP), it generally indicates that the rocket may experience erratic flight patterns. Stability in rocket flight is largely governed by the relationship between these two points. When the CG is ahead of the CP, the rocket tends to be stable and will maintain a straight trajectory because aerodynamic forces will tend to push the nose back toward the direction of the flow, creating a restoring moment.

In contrast, having the CG behind the CP means that any disturbances will result in increased instability. For instance, if the rocket experiences a slight tilt or pitch, the aerodynamic forces will push the rocket further off its intended path rather than correcting it. This can lead to oscillations or spiraling motions, making the flight unpredictable and erratic.

Thus, the location of the CG in relation to the CP is crucial for ensuring stable flight; when the CG is behind the CP, the rocket is prone to instability and erratic flight patterns.