Had a great time building a compressed air cannon with some cute girls for a HS Physics class.
It started out small... but we had extra PVC, so why not make it BIG!
It was a lot of fun.
I got to contribute the cool "racing fire" duct tape to really jazz it up...
Then there was the shooting! WAY too fun!
The key was alot of TP for wadding. There were several challenges, but as the girls learned: "Scientists are the philosophers of the natural world... but ENGINEERs make it happen!"
We got it up to 75 psi...