Fin Stabilzation
Control systems for rockets keep a rocket stable in flight and steer it. Small rockets usually require only a stabilizing control system. Large rockets, such as the ones that launch satellites into orbit, require a system that not only stabilizes the rocket but also enables it to change course while in flight. Fin stabilizers are an another way to stabilize the rockets. These are generally alingned in the direction of motion. But when the rocket changes its direction due to air flow , the air will strike these fin stabilizers and thus a component of this force is used to rotate the rocket back into the desired direction and thus stabilizing it.
AIM
To allow a rocket to maintain is orientation and intended flight path by providing a restoring torque caused by air drag
APPROACH
By using an Arduino based system and a gyro sensor the vertical tilt of the rocket can be estimated. And servo controlled fins can be used to provide the necessary torque required to correct the rockets trajectory.