Thank you very much jackssmirkingrevenge. I was thinking about a 1.2 ratio because of this article: http://www.inpharmix.com/jps/Optimal%20Chamber%20Volume%20for%20a%20Fixed%20Barrel%20Size.html They state: As you can see, the scaling model predicts that, for a fixed size barrel, the maximum muzzle ...

Hello everyone, I'm new to the forum and I'm about to create my first combustion spud gun. I'd like it to be max 2 meters long. I've read many things across many websites on the best ratio and it is very confusing (0.8, 1, 1.2, 1.5, 1.7, 2,...). Anyways as I understand the best studies on the subjec...