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you can make a rocket projectile using a PVC pipe and a cone folded from a piece of paper.
take 1/4th of an A4 size paper and keep rolling it into a cone. one tip will become a point
and then you apply tape to secure the paper in place. also take some tape and apply it
on the base of cone. this will make the tip strong. now place this in the 30cm long PVC
pipe. because cone is slightly longer, now draw a circle where the cone meets the pipe
and cut out this circle. now cone will have the same diameter as the internal diameter
of the pipe. it is tailor made for the pipe. now place this cone in the pipe and blow hard
on a newspaper target and you will be surprised that the cone pierces the newspaper. try a
second cone and now the third one. now we have a look at the cones from near. all the
three ones pierce the newspaper. this is the front view and this is the back view. you
can also blow the cone in air and it will go like a projectile. never target the cone
on a living being.