I built a 3 ft long 2.63" OD rocket from a Hi-Tec kit, and modified it to be more stable according to OpenRocket. The final design had a stability of about 1.7 cal. I put an Aerotech H100 motor in it and launched it at the ROC launch site. The rocket was recovered successfully in a perfectly re-flyable condition, and my Tripoli Level 1 High Power Certification was obtained. The last video is the successful flight and the cover photo is what the rocket looked like after recovery.