Flat Reducer or Non-Flat Reducer?

[LordGarbash]

Hey everyone,
I've heard and seen plans for spud guns using flat reducers and ones using non-flat reducers. Which one of theses 2 generally yields more power, or is there a difference.

I would think that the non-flat ones would be stronger due to the way that it more funnels the expanding gas towards the barrel, but let me know if it's otherwise.

[sgort87]

There shouldn't be any difference. And if there is, it's not by far. Pressure works in funny ways. Usually no matter how steep the reduction is, pressure finds a way to make it work the same in any instance.