My Estes Majestic flying on a G74 White Lightning at Bridgeton Area Rocket Club on March 30, 2019. The unusual flight pattern initially led me to think a fin had sheared off or the airframe had been compromised somehow, but post flight inspection did not show evidence of either, leading me to suspect that it likely encountered a wind shear or a pocket of turbulent air on the way up. The predicted altitude was 2200 feet, and the recorded altitude was 2177 feet with a top speed of 448 mph.