Reply To: A theoretical exploration of physical possibilities, AKA Let's Make A Monster
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I haven’t researched the Hercules much, but in theory two compression cylinders (I’m thinking a side-by-side configuration) could have mated outlet ports, so as to funnel the flow into one point. I cannot help but wonder if simply increasing the size of the piston might suffice, since it appears that the .30 Carnivore springer uses the same size cylinder as the rest of the 135 series. From my (admittedly limited) knowledge of physics, the same size piston delivering the same amount of force at the outlet port would produce different velocities for different calibers, due both to the increased weight of larger projectiles and the expansion of the volume of air in a larger bored barrel. To compensate for this, you would need to move a larger quantity of air in the same amount of time, thus generation much higher internal air pressures. You could do this by using two cylinder (an idea which I find very interesting), increasing the diameter of the piston so as to compress a larger amount of air within the same space, or lengthen the piston, so you are pushing a larger quantity of air over a longer firing cycle.
As far as the barrel length, I once read that 24″ is about the optimum length for springers. Longer than that actually is supposed to reduce accuracy, due to drag on the pellets and lost force behind it due to expansion in the barrel. Lengthening or widening the piston would obviously alter this, as a greater amount of air is being pushed behind the pellet. I cannot verify this conjecture, as it was taken from reading a rather vitriolic back-and-forth between two reviewers of a rifle. If anyone knows the true answer to this or any other questions of ballistics, please do chime in. I really wish I paid more attention in Physics class now…