I never stated that longer cylinders were worse. I simply stated that cylinder length is irrelevant for perfect voluming. Which, it is. Perfect voluming is getting the highest air efficiency out of either your cylinder size or your barrel length, whichever you choose to make the standard, with the BB weight you’re hoping to use.
Ideally, people would all chrono with their game ammo, in joules, with their hops set to what they typically play with. Joule creep is simply a method by which one might use a weaker spring to do the work of a stronger spring through increased efficiency, increasing silence, durability, and I believe accuracy (I can’t quantify this claim. It’s a hunch and a shakily substantiated observation of mine. I have no science to reference here)
A longer cylinder allows a longer theoretical time for the piston to accelerate. However, depending on piston weight, cylinder friction, spring strength, BB weight, BB size, hop rubber, etc… the piston may not actually ever accelerate faster than an ordinary AEG piston. I believe 1tonne talks about this in a stickied post about cylinder weight.
I will also point out that ported cylinders actually allow for a higher pressure spike at the hop rubber over full cylinders. This is because the piston experiences no pushback for the first part of it’s travel, and is able to gain momentum freely, before “striking” the air and gaining compression, and abruptly transferring that gained energy to the air in the cylinder before beginning to travel again.
This may not be possible to hear on video, but I have a build with an 18g piston assembly and 60% ported cylinder where you can hear the piston slap as a separate noise over the barrel pop. I.e. the piston is slowed and creates enough space to separate the sounds. Interesting this rifle is also very consistent, despite possessing a light piston.
trying to post video here…
Conversely, longer full cylinders create a
constant gradual pushback against the piston, which may not be the best for optimum speed,
I suspect top piston speed while retaining okay volume is:
35g piston assembly.
M135 equivalent or higher.
The pressure spike at the hop rubber would be crazy compared to what folks normally build.
Not that this idea is useful at all, just a though experiment.