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 ...

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 ...