Okay, me and my friend are testing different fuels- from Axe to Propane in a potato cannon. However, for this to work for school, we need to control variables. I talked earlier about running a current through screws with a battery, and I've found that that's a little far fetched. Here's a design that my friend, my mentor (who happens to know a good bit about electrical engineering and the like) and I nailed down. This controls fuel amount, firing angle, projectile (not pictured, I have a plan) and a few other design things I've worked with should eliminate any other problems. Tell me what you think.
