I am designing a rocket. THis rocket is designed to go upwards being powered by 2 Estes engines. After about 2 seconds, the engines will burn out. Then, a third engine will light up 7 seconds after the 2 engines burn out. The rocket is supposed to go upwards nearly perfectly straight, then start gliding down. As it is gliding down, it is supposed to then launch another engine causing the glider to glide down quickly. I am having a problem however. WHen the glider goes upwards, it immidately goes into a spin. It goes forward (nose down) and then spins repeatedly. The first test launch I did, I had no flaps to cause drag. This caused the rockets to glide upwards then backwards so the belly of it was facing towards the sky. The seoncd time I put a lot of flaps on it to cuase drag. This caused it to go into a HUGE spiral. This time (the third time) there was a spiral only not as much. I believe that if I reduce the hight of the flaps then this will solve the problem. I am wondering however, is there any kind of physics formula that could help me determine how long of flaps I should use? ANy ideas? Below are the photos of it. Please give me feedback for my next test launch. Again, when it is launched it goes nose downards into a spiral which makes it appear there is too much flaps. I just don';t know how much to reduce the flappage by. ANy ideas and professional feedback appreciated.