We made the rocket tops. http://junior.renmoreschool.com/making-air-projectiles-rockets-2/
We used our knowledge of 2D and 3D shapes to make our rockets. (Cylinders made from rectangular pages, squares and triangles made from rectangles, and cones made from circles).
Today we flew them using a bicycle pump
with air under pressure (from a bicycle pump).
We launched them outside.
It was a lot of fun!
We could plan the trajectory by moving the pipe in the way we wanted our air projectiles to fly!