Our original idea was to make a ball that had wings and flew, similar to a Golden Snitch. In our prototype, we designed a ball with wings, with a propellor on the front. We had two prototypes, one with a circular body, and one with a decahedric body. What didn't really work about this design is how the plane would lift itself, because the propellor did not have the strength to pull the plane forward. 

Our next idea ditched the concept of a sphere and replaced it with a ducted fan. This worked a lot better than the previous idea. This new plane had a lot bigger wings, and was the first one to have a propellor and motor inside of it. The plane could not steer, as we did not install a rudder. The plane still could not carry itself, so we added a lot more in the final. 

Our final design is a similar 3D printed shell, but with a rudder, elevator and wings of stronger foam. The tail was a new addition to the aircraft, and the plane could now steer, and go up and down. The wings were much longer compared to the original ones, and made out of stronger foam.