What will happen if you do not recalibrate the CG after changing the motor?

When you change the motor in a rocket, it can significantly alter the center of gravity (CG) due to differences in weight and placement between the new motor and the previous one. If you fail to recalibrate the CG after changing the motor, the flight stability of the rocket may be adversely affected.

A compromised flight could result in erratic behavior during launch and ascent, potentially leading to a loss of control, deviation from the intended flight path, or even complete failure of the rocket. The CG is critical to ensuring that the rocket remains stable and flies correctly; any changes need careful adjustment to maintain an appropriate balance for successful flight. Thus, neglecting to recalibrate the CG puts the mission at risk, making it essential to check and adjust it after any changes in components like the motor.