My sophomore year science fair project: was a model rocket that could break the sound barrier. Technically. While this rocket did indeed break the sound barrier, fin shear off caused by the parachute charge going off early resulted in a rapid unscheduled disassembly. However, the rocket attained a maximum speed of 890 miles per hour, or Mach 1.16. Designed using OpenRocket, RasAero II, and Autodesk Inventor.
The completed rocket.
Openrocket design page. This rocket ran off of a G80 motor, the largest motor available without a level 1 certification.
Engineering Drawings for a custom launch tower.
An Arduino-powered box I designed to test parachute charges.
The final launch tower.
Testing the flight computer.
Launch tower + rocket in Autodesk Inventor.
Laser cut and hand-sanded fins.
The launch!
Post-flight remains.