This flight is of my two-stage "Test Rocket". It has vertical stabilization located at the top of the sustainer. The flight was an M1665 to M745 with a projected altitude of 22K feet. Due to coning (due to wind?), the rocket did not make the required staging altitude and the sustainer did not light. Sustainer did go vertical after separation however. Lots of videos of the stabilization system in action on my channel (search "Jiminaus50").