I'm trying to understand your question. How sharp does the broadhead need to be? The indians used flint for centuries. Is there a science to this that I was unaware of? A broadhead needs to be about as sharp as a butterknife when propelled from a compound bow from this century. I think you already have an idea about how sharp a broadhead should be. Tell us what you think and we'll all have a better idea about the whole thing. And yes, I have bowhunted before. It is an art, I know. Nowadays we have guns that are much more efficient at cleanly killing our prey. So, it's kind of like asking how sharp a bullet needs to be.
I had a good friend who was an awesome bow hunter. I lived in Michigan at the time and really looked up to this guy. He went to great lengths to sharpen his skills at bow hunting. He practiced with his bow in every situation he could ever hope to have to use in hunting. But every year he wound up losing several deer while bow hungint. Most times it was when his arrow would pass completely through the deer. Now that's an indication of a sharp broadhead. I helped him track many deer way into the night with very little success at recovering the deer. Hell, he got me into bow hunting. But I figured out early on that gun hunting was far superior to bow hunting. I have never, spelled NEVER lost a deer that I shot at and hit while gun hunting. Oh, I came close a few times to be sure. But that had to do with using a scope I wasn't used to. There's a lesson in that as far as I'm concerned. Use superior means to take game. That's how sharp your broadhead needs to be.