I Can't Believe It's Not Supersonic was CUInSpace's competition rocket in 2021. It was the second launcher to be affected by COVID 19 pandemic restrictions, leading to the cancellation of the in-person component of the Spaceport America Cup.

This rocket was intended to be the first to use fully composite student-designed body tubes, providing significant weight savings over previous rockets. 

The design was presented at the 2021 Virtual Spaceport America Cup, placing 13th in its division.