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I was reading through this, and it got me thinking:
Would the way to find the perfect cylinder length (or even where to cut holes in a full cylinder to get a more efficient go) to do a simple volume analysis?
That is, you'd want the same volume (not mass - it's constant no matter the pressure) both right before compression starts and the bb is still at the start of the barrel, and when the piston has reached the end and the bb is just about to leave the barrel?
That said, Mcguyver, on Semi I believe that you would still get some vacuum suck back if your cylinder wasn't matched with your barrel. Because as the BB travels down the barrel, the mass of air inbetween it and the piston head does not change. (assuming the piston is momentarily at rest) The volume however is changing, resulting in a forced expansion of air beyond a pressure of one atmosphere, creating a back pressure. (again, only if your cylinder and barrel length aren't matched (cylinder too short for your barrel length)).
I could be wrong, as I'm not fully learned in the whole cycle the AEG goes through, and the timing of when everything happens.
Using a tight-bore would mean you could get away with a smaller cylinder, correct? (technically speaking, though the effects may be negligable)
Basically what i'm saying is this: Say you have a 450mm 6.02 barrel (assuming the bb is waiting for the compression right at beggining of the barrel). That means that your barrel has 12.8 cubic cm's of volume, so, right before the piston head begins compression, you'd want 12.8 cubic cm's of volume between the bb and your piston head.
Am I right or wrong in my thinking?
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