This group is all about the science of projectile propulsion using stuff you can get at the hardware store.
Basically, combustion and pneumatic cannon designs will be accepted. You can talk about your gun all you want, and you can add designs. After posting a design, I will edit it until I deem it safe. Any extremely unsafe/flawed designs will be deleted immediately.
Also, nothing illegal will be discussed here. No shooting of anything living will be discussed. On the topic of no illegal stuff, if your country says these things are illegal, (U.S. citizens can own and operate a potato gun), then don’t join.