This model rocket was modified to fit 4 servos, each controlling the position or a fin. An accelerometer in the nose cone gave data to the Arduino in which it calculated servo positions that would keep the rocket flying straight. The burn time is short and the flight path is created so that the rocket would have arched over and crashed about 20 feet away from the pad. Since the system kicked in, the fins moved so that complete horizontal flight was achieved for a second before the motor went out. This proves the system worked. There is much more information and some pictures on the related link.