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Thanks for the response, both of you. I was checking over the article you mentioned, and I see that they were talking about an automatic fire, and barrel to volume ratios. I see that that does not apply to me, because this will be bolt action.
I took up this project, as to find the most economic, and reliable way to make a very powerful rifle. I'm not going to go into the details, but I can say that I am creating the cylinder, piston, spring-guide, and other things from high quality hydrolic pipe. I'm quite adventurous, and the only things I plan on purchasing will be the barrel, and the spring.
It's a very experimental thing, which was the point initially. And, I love the challenge. Here's what I have so far:
The spring reaches maximum velocity on equilibrium. Meaning, it's neutral point, but I have to compensate for cylinder friction. So, I want to have the actual cylinder long enough to match. And, I know, that displacement from equilibrium affects velocity, too [Ep=1/2kx^2]. So, the optimal piston starts with the spring fully compressed, and hits the end of the cylinder at top speed.
Now, the conflict I have, is where in the piston's journey does it start to compress air? What I'm wondering is, what is standard? If nobody knows the answer, does anyone have any idea how to calculate it?
As for tools, I am pretty limited. For testing, I would need a means to meause velocity, which I don't have. So, tinker-testing is sort of a last resort.
//Tendril
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